AKEEM AYINDE RAHEEM | Ladoke Akintola University of Technology (original) (raw)

Papers by AKEEM AYINDE RAHEEM

Research paper thumbnail of Evaluation of the strength performance and microstructural properties of different based metakaolin blended cements containing greenly synthesized nanosilica

Deleted Journal, May 1, 2024

Research paper thumbnail of Comparative studies on flexibility characteristics of steel and fanpalm reinforced two bay concrete portal frames

LAUTECH Journal of Civil and Environmental Studies, Mar 1, 2019

Reinforced concrete constitutes over 90 % of the infrastructures in developing countries and over... more Reinforced concrete constitutes over 90 % of the infrastructures in developing countries and over 75 % of constructed facilities in industrialized nations. Steel is the main material used as reinforcements in the structural members. Steel is expensive and the need to find alternative locally available, suitable material to steel is a quest to researchers. The use of Fanpalm, as a locally available material as reinforcement in place of steel in portal frames is the main focus of this study. The theoretical and experimental investigation of the flexural strengths, deflection characteristics and cracking behaviors of fanpalm/steel reinforced two bay concrete portal frames were examined. The result showed linear load-deflection curves up to the first crack, thereafter, a non linear relationship between the load and deflection occurred irrespective of the reinforcement used. The fanpalm reinforced portal frames exhibited larger deflections, increased crack numbers and crack widths compared with equivalent steel reinforced ones. The numbers of cracks formed and the load carrying capacities (flexural strength) of the frames up to failure point increased with increase in percentage of reinforcements.

Research paper thumbnail of Effect of ash fineness and content on consistency and setting time of RHA blended cement

Materials Today: Proceedings, 2023

Research paper thumbnail of Effects of Hollow Sizes on the Properties of Sandcrete Blocks

Abuja Journal of Veterinary and Biomedical Sciences, Sep 1, 2021

Two-cell hollow sandcrete blocks constitute the dominant wall construction material for modern sh... more Two-cell hollow sandcrete blocks constitute the dominant wall construction material for modern shelter in many African countries, especially Nigeria. The hollow cavities in the block have adverse effect on its mechanical characteristics. This study investigated the effects of hollow sizes on the properties of sandcrete blocks.

Research paper thumbnail of Enhancing the Flexural Strength of Concrete using Recycled Iron and Steel Slag Aggregate

LAUTECH Journal of Civil and Environmental Studies, Sep 1, 2021

Concrete is strong in compression but weak in tension hence, considerable effort is required to i... more Concrete is strong in compression but weak in tension hence, considerable effort is required to improve concrete's tensile strength by the use of pre-stressed concrete and addition of admixtures or additives. In this study, the use of recycled iron and steel slag (RISS) aggregate to improve the tensile strength of concrete was considered. The paper assessed the mineralogical composition of RISS and granite aggregates, and gradation. It also determines the effects of RISS aggregate on the flexural strength of

Research paper thumbnail of The comparative study of using wood ash in lieu of fly ash in South African blended cement paste and mortar

Materials Today: Proceedings

Research paper thumbnail of Sustainability assessment of cement concrete modified with bagasse ash and calcite powder

Materials Today: Proceedings

Research paper thumbnail of Influence of Metakaolin from Different Sources on Mechanical and Microstructural Properties of Blended Cement Mortar Infused with Nanosilica

Research paper thumbnail of Application of Saw Dust Ash as Partial Replacement for Cement in the Production of Interlocking Paving Stones

International Journal of Sustainable Construction Engineering and Technology, Jun 24, 2017

As a way of reusing and converting industrial by-products into useful materials for the construct... more As a way of reusing and converting industrial by-products into useful materials for the construction industry, this paper investigated the application of Saw dust ash (SDA) as partial substitute for ordinary Portland cement (OPC) in the production of interlocking paving stones. The study examined the oxide composition of SDA to determine its suitability as a pozzolanic material. Some characteristics of paving stones with SDA as a substitute for OPC were investigated and the results indicated that SDA is a good pozzolan having satisfied the required standards. The compressive strength of the samples, with substitution levels ranging from 5 to 25% cured for 3-56 days, was lower at initial curing period but improved significantly at later days. 5% substitution level showed an increase in strength compared to 0% SDA paving stones regardless of curing period. Density decreased with increasing ash content, whereas water absorption increased with SDA content. The study therefore indicated that SDA paving stones can gain higher strength than the conventional ones at longer curing periods, which is as a result of its pozzolanic reactions.

Research paper thumbnail of Tensile Strength Characteristics of Fanpalm under Various Exposure Conditions

Innovative Systems Design and Engineering, 2013

Fanpalm is a prospective reinforcing material in structural elements. Fanpalm is locally availabl... more Fanpalm is a prospective reinforcing material in structural elements. Fanpalm is locally available and has been studied as a suitable alternative to steel reinforcement which is usually imported and expensive. The need for durability of the fanpalm under varying exposure conditions is the concern of this study. The ultimate tensile strength of fanpalm was determined under various exposure conditions to evaluate its possible usage, both on short term and long term basis. Fanpalm specimens were cut, shaped and coated with various protective agents (sodium sulphate, magnesium sulphate, hydroxylamine, epoxy, and sulphur) then cured in alkaline media(0.1N sodium hydroxide solution) for 3, 7, 14, 28 and 56 days. A set of uncoated Fanpalm were subjected to the same curing conditions as the coated specimens to serve as the control. Tensile strength tests were carried out to evaluate the ultimate tensile stress at various ages for each of the exposure conditions. The results showed that epoxy coated fanpalm specimens recorded the highest strength at 56 days of 80.83N/mm 2 while magnesium sulphate coated specimens had the lowest strength of 66.25N/mm 2 during the same period. The uncoated specimens had average strength of 65.00N/mm 2 at 56 days in alkaline media. It could be said that the coating improves the tensile strength of fanpalm in alkaline media. It was concluded that fanpalm coated with epoxy could be used as a reinforcing material in concrete structures for short term usage. Further evaluation of the strength of epoxy coated specimens over longer duration (say one year) should be carried out to determine its usage as reinforcements on long term basis.

Research paper thumbnail of Incorporation of metakaolin and nanosilica in blended cement mortar and concrete- A review

Journal of Cleaner Production, 2021

Abstract The construction industries are focusing on the use of innovative, cost efficient and ec... more Abstract The construction industries are focusing on the use of innovative, cost efficient and ecofriendly materials in infrastructural development. In view of this, there is need to search for alternative construction materials that can be used in place of the conventional normal concrete. There have been numerous materials that could be used as supplementary cementitious materials in concrete thereby making it sustainable and durable. Some of these materials are naturally occurring or byproducts of agro-based or manufacturing industries, and as well as agricultural wastes. Metakaolin being obtained from naturally occurring kaolin clay had been extensively used in place of cement in mortar/concrete making but much attentions have not been given towards considering the effect of the source of the clay on its reactivity properties as well as effect of factory blending approach of MK and clinker. Also, the delay in strength attainment of pozzolan blended concrete calls for incorporation of innovative materials that will enhance the development of strength at early stages. Nanoparticles are innovative construction materials obtained from green plants or chemical and have been shown to enhance the development of mechanical properties of mortar and concrete at low age of curing with enhancement in microstructural arrangement. There is need to explore more of the green method of synthesis as recent researches are tailored towards the reduction/eradication of greenhouse gases that could deplete the ozone layer. This article focuses on previous researches that have been carried out to investigate the effect of MK and nanosilica on the properties of mortar and concrete.

Research paper thumbnail of Machine learning algorithms in wood ash-cement-Nano TiO2-based mortar subjected to elevated temperatures

Research paper thumbnail of Early strength development assessment of concrete produced from cement replaced with nano silica activated Corn Cob Ash

Materials Today: Proceedings

Research paper thumbnail of Investigation on thermal properties of rice husk ash-blended palm kernel shell concrete

Environmental Challenges, 2021

Abstract The contribution of buildings to climate change as a result of energy consumption and gr... more Abstract The contribution of buildings to climate change as a result of energy consumption and greenhouse gas emissions necessitates the use of agro-industrial by-products as alternative construction materials. The present study examines the thermal properties of Rice husk ash-blended Palm Kernel Shell Concrete (RHA-blended PKSC). Three control concrete mixes with mix ratios of 1:1½:3, 1:2:4 and 1:3:6 using water-to-cement (w/c) ratios of 0.5, 0.6 and 0.7, respectively were made with cement, river sand and granite. For each mix ratio with the respective w/c ratio, five concrete mixes containing RHA fixed at 15% as replacement for cement and PKS at 20, 40, 60, 80 and 100% as replacement for crushed granite were produced. The oven-dry density, compressive strength and thermal properties (thermal conductivity, thermal diffusivity, volumetric heat capacity and thermal resistivity) were determined. The results showed that the oven-dry density and compressive strength of concrete declined with increasing PKS content. Nevertheless, the compressive strength increased with curing age and the gain in strength of RHA-blended PKSC were higher than the control at the later age. The thermal conductivity and diffusivity decreased with increasing PKS contents but increase with curing age while volumetric heat capacity and thermal resistivity increased as PKS content increases but decreased with curing age. In addition, concrete with 1:3:6 mix ratio exhibited the lowest thermal conductivity and diffusivity but higher volumetric heat capacity and thermal resistivity than those with 1:1½:3, 1:2:4 mix ratios. RHA-blended PKSC with 40% PKS and 15% RHA for 1:1½:3 mix ratio attained the compressive strength and thermal conductivity values recommended for lightweight aggregate concrete which is suitable for structural and insulation purposes. It was concluded that the combined use of PKS and RHA as raw materials in concrete is effective in improving concrete's thermal and insulation properties.

Research paper thumbnail of Flexural Strength Characteristics of Beams Reinforced with Fan Palm under Various Exposure Conditions

Innovative Systems Design and Engineering, 2015

The relative high cost of man-made imported fibres like, glass, steel and plastics used in cement... more The relative high cost of man-made imported fibres like, glass, steel and plastics used in cement based composites as reinforcement calls for investigation into the use of locally available natural fibre as a substitute. Fan palm is locally available and has been studied as a suitable alternative to steel reinforcement. The need for durability of the fan palm under varying exposure conditions is the concern of this study. The ultimate flexural strength of beams reinforced with fan palm under diverse exposure conditions was determined to evaluate its possible usage, both on short and long term basis. Fan palm specimens were cut, shaped to desired flexural reinforcements sizes and coated with water repellants (epoxy, sulphur and bitumen) and blocking agents (hydroxylamine, sodium sulphate magnesium sulphate) for 24 hours. They were then used as reinforcements for concrete beams (75 x 100 x 500 mm) of 1:2:4 mix ratio and cured in alkaline media (0.1N sodium hydroxide solution). Two se...

Research paper thumbnail of Characterisation of Lateritic Soil from Selected Locations along Ibadan – Oyo Expressway for Highway Pavement Construction

LAUTECH Journal of Civil and Environmental Studies, 2018

A good understanding of the engineering properties of lateritic soil is highly essential for effe... more A good understanding of the engineering properties of lateritic soil is highly essential for effective use of the soil for highway pavement construction. The alarming rate of highway pavement failures within the study area has been attributed to paucity of information on the properties of the soil within the study zone. Therefore, the lateritic soils along selected locations along Ibadan – Oyo were characterised for their suitability for highway construction. Ten (10) lateritic soil samples were collected and they were labelled Trial Pit (TP) 1 to 10. The samples were subjected to the following laboratory tests: Sieve analysis, Liquid Limit (LL), Plastic Limit (PL), and Shrinkage Limit (SL), British Standard (BS), West African Standard (WAS), Modified AASHTO compaction and California bearing ratio. The samples were classified using AASHTO classification system. The results of the sieve analyses for percentage passing the 75 m ranged from 15.6 – 33.7%, LL, PL and SL ranged from 30.1 ...

Research paper thumbnail of A study of thermal conductivity of wood ash blended cement mortar

Research paper thumbnail of Influence of Nanosilica on Workability and Compressive Strength of Wood Ash Cement Concrete

LAUTECH Journal of Civil and Environmental Studies, 2019

Studies have revealed that wood ash cement concrete just like other pozzolanic cement concrete ha... more Studies have revealed that wood ash cement concrete just like other pozzolanic cement concrete has lower early strength compared to plain cement concrete. Nanoparticles have been found to improve the early strength of concrete due to its small size and large surface area. This paper reports the influence of nanosilica on the workability and compressive strength of wood ash cement concrete. Wood ash was obtained as a waste product from Ladoke Akintola University of Technology (LAUTECH) bread bakery, Ogbomoso. Biological synthesis of nanosilica using kola Pod extract and silica precursor (1:5) was conducted at Nanotechnology research group laboratory at LAUTECH. The chemical composition, specific gravity and particle size distribution of wood ash, fine and coarse aggregate used were determined. Concrete with 10% wood ash replacement for cement was produced using1:2:4mix proportion and water to binder ratio of 0.5.Nanosilica was added at 0.5, 1.0, 1.5 and 2.0% levels. Concrete with no ...

Research paper thumbnail of Investigation of Workability and Compressive Strength of Wood Ash Cement Concrete Containing Nanosilica

Advanced Materials Research, 2019

Studies have revealed that wood ash cement concrete just like other pozzolanic cement concrete ha... more Studies have revealed that wood ash cement concrete just like other pozzolanic cement concrete has lower early strength compared to plain cement concrete. Nanoparticles have been found to improve the early strength of concrete due to its small size and large surface area. This paper reports the findings on influence of nanosilica on the workability and compressive strength of wood ash cement concrete. Wood ash was obtained as a waste product from Ladoke Akintola University of Technology (LAUTECH) bread bakery, Ogbomoso. Biological synthesis of nanosilica using kola pod extract and silica precursor (1:5) was conducted at Nanotechnology research group laboratory at LAUTECH. The chemical composition, specific gravity and grading of wood ash, fine and coarse aggregate used were determined. Concrete with 10% wood ash replacement for cement was produced using 1:2:4 mix proportion and water to binder ratio of 0.5. Nanosilica was added at 0.5, 1.0, 1.5 and 2.0% levels. Concrete with no wood...

Research paper thumbnail of Economic Exploitation of Gravel in Place of Granite in Concrete Production

Materials Science Forum, 2016

The paper investigated the application of gravel as partial economic replacement of granite in co... more The paper investigated the application of gravel as partial economic replacement of granite in concrete production. Concrete was produced using granite/gravel combination in varying percentages of 90/10, 80/20, 70/30, 60/40, 50/50, 40/60, 30/70, 20/80 and 10/90. Concrete made from 100 % granite and 100 % gravel served controls while other constituents of concrete were kept constant. Two different mix ratios of 1:2:4 and 1:3:6 were employed. Sieve analysis was carried out on the aggregates, while slump and compaction factor tests were carried out on fresh concrete. Compressive strength tests were performed on hardened concrete. Specimens were produced using 150 mm cubes for compressive tests. The reliable percentage of granite/gravel combination from compressive strength view point 60/40 with a value of 21.15 N/mm2 for mix ratios 1:2:4 and 70/30 with 15.17 N/mm2 for 1:3:6 mix ratio at 28 days. Satisfying respectively the 20 N/mm2 and 15.17 N/mm2 minimum requirement of BS 8110: 1997.T...

Research paper thumbnail of Evaluation of the strength performance and microstructural properties of different based metakaolin blended cements containing greenly synthesized nanosilica

Deleted Journal, May 1, 2024

Research paper thumbnail of Comparative studies on flexibility characteristics of steel and fanpalm reinforced two bay concrete portal frames

LAUTECH Journal of Civil and Environmental Studies, Mar 1, 2019

Reinforced concrete constitutes over 90 % of the infrastructures in developing countries and over... more Reinforced concrete constitutes over 90 % of the infrastructures in developing countries and over 75 % of constructed facilities in industrialized nations. Steel is the main material used as reinforcements in the structural members. Steel is expensive and the need to find alternative locally available, suitable material to steel is a quest to researchers. The use of Fanpalm, as a locally available material as reinforcement in place of steel in portal frames is the main focus of this study. The theoretical and experimental investigation of the flexural strengths, deflection characteristics and cracking behaviors of fanpalm/steel reinforced two bay concrete portal frames were examined. The result showed linear load-deflection curves up to the first crack, thereafter, a non linear relationship between the load and deflection occurred irrespective of the reinforcement used. The fanpalm reinforced portal frames exhibited larger deflections, increased crack numbers and crack widths compared with equivalent steel reinforced ones. The numbers of cracks formed and the load carrying capacities (flexural strength) of the frames up to failure point increased with increase in percentage of reinforcements.

Research paper thumbnail of Effect of ash fineness and content on consistency and setting time of RHA blended cement

Materials Today: Proceedings, 2023

Research paper thumbnail of Effects of Hollow Sizes on the Properties of Sandcrete Blocks

Abuja Journal of Veterinary and Biomedical Sciences, Sep 1, 2021

Two-cell hollow sandcrete blocks constitute the dominant wall construction material for modern sh... more Two-cell hollow sandcrete blocks constitute the dominant wall construction material for modern shelter in many African countries, especially Nigeria. The hollow cavities in the block have adverse effect on its mechanical characteristics. This study investigated the effects of hollow sizes on the properties of sandcrete blocks.

Research paper thumbnail of Enhancing the Flexural Strength of Concrete using Recycled Iron and Steel Slag Aggregate

LAUTECH Journal of Civil and Environmental Studies, Sep 1, 2021

Concrete is strong in compression but weak in tension hence, considerable effort is required to i... more Concrete is strong in compression but weak in tension hence, considerable effort is required to improve concrete's tensile strength by the use of pre-stressed concrete and addition of admixtures or additives. In this study, the use of recycled iron and steel slag (RISS) aggregate to improve the tensile strength of concrete was considered. The paper assessed the mineralogical composition of RISS and granite aggregates, and gradation. It also determines the effects of RISS aggregate on the flexural strength of

Research paper thumbnail of The comparative study of using wood ash in lieu of fly ash in South African blended cement paste and mortar

Materials Today: Proceedings

Research paper thumbnail of Sustainability assessment of cement concrete modified with bagasse ash and calcite powder

Materials Today: Proceedings

Research paper thumbnail of Influence of Metakaolin from Different Sources on Mechanical and Microstructural Properties of Blended Cement Mortar Infused with Nanosilica

Research paper thumbnail of Application of Saw Dust Ash as Partial Replacement for Cement in the Production of Interlocking Paving Stones

International Journal of Sustainable Construction Engineering and Technology, Jun 24, 2017

As a way of reusing and converting industrial by-products into useful materials for the construct... more As a way of reusing and converting industrial by-products into useful materials for the construction industry, this paper investigated the application of Saw dust ash (SDA) as partial substitute for ordinary Portland cement (OPC) in the production of interlocking paving stones. The study examined the oxide composition of SDA to determine its suitability as a pozzolanic material. Some characteristics of paving stones with SDA as a substitute for OPC were investigated and the results indicated that SDA is a good pozzolan having satisfied the required standards. The compressive strength of the samples, with substitution levels ranging from 5 to 25% cured for 3-56 days, was lower at initial curing period but improved significantly at later days. 5% substitution level showed an increase in strength compared to 0% SDA paving stones regardless of curing period. Density decreased with increasing ash content, whereas water absorption increased with SDA content. The study therefore indicated that SDA paving stones can gain higher strength than the conventional ones at longer curing periods, which is as a result of its pozzolanic reactions.

Research paper thumbnail of Tensile Strength Characteristics of Fanpalm under Various Exposure Conditions

Innovative Systems Design and Engineering, 2013

Fanpalm is a prospective reinforcing material in structural elements. Fanpalm is locally availabl... more Fanpalm is a prospective reinforcing material in structural elements. Fanpalm is locally available and has been studied as a suitable alternative to steel reinforcement which is usually imported and expensive. The need for durability of the fanpalm under varying exposure conditions is the concern of this study. The ultimate tensile strength of fanpalm was determined under various exposure conditions to evaluate its possible usage, both on short term and long term basis. Fanpalm specimens were cut, shaped and coated with various protective agents (sodium sulphate, magnesium sulphate, hydroxylamine, epoxy, and sulphur) then cured in alkaline media(0.1N sodium hydroxide solution) for 3, 7, 14, 28 and 56 days. A set of uncoated Fanpalm were subjected to the same curing conditions as the coated specimens to serve as the control. Tensile strength tests were carried out to evaluate the ultimate tensile stress at various ages for each of the exposure conditions. The results showed that epoxy coated fanpalm specimens recorded the highest strength at 56 days of 80.83N/mm 2 while magnesium sulphate coated specimens had the lowest strength of 66.25N/mm 2 during the same period. The uncoated specimens had average strength of 65.00N/mm 2 at 56 days in alkaline media. It could be said that the coating improves the tensile strength of fanpalm in alkaline media. It was concluded that fanpalm coated with epoxy could be used as a reinforcing material in concrete structures for short term usage. Further evaluation of the strength of epoxy coated specimens over longer duration (say one year) should be carried out to determine its usage as reinforcements on long term basis.

Research paper thumbnail of Incorporation of metakaolin and nanosilica in blended cement mortar and concrete- A review

Journal of Cleaner Production, 2021

Abstract The construction industries are focusing on the use of innovative, cost efficient and ec... more Abstract The construction industries are focusing on the use of innovative, cost efficient and ecofriendly materials in infrastructural development. In view of this, there is need to search for alternative construction materials that can be used in place of the conventional normal concrete. There have been numerous materials that could be used as supplementary cementitious materials in concrete thereby making it sustainable and durable. Some of these materials are naturally occurring or byproducts of agro-based or manufacturing industries, and as well as agricultural wastes. Metakaolin being obtained from naturally occurring kaolin clay had been extensively used in place of cement in mortar/concrete making but much attentions have not been given towards considering the effect of the source of the clay on its reactivity properties as well as effect of factory blending approach of MK and clinker. Also, the delay in strength attainment of pozzolan blended concrete calls for incorporation of innovative materials that will enhance the development of strength at early stages. Nanoparticles are innovative construction materials obtained from green plants or chemical and have been shown to enhance the development of mechanical properties of mortar and concrete at low age of curing with enhancement in microstructural arrangement. There is need to explore more of the green method of synthesis as recent researches are tailored towards the reduction/eradication of greenhouse gases that could deplete the ozone layer. This article focuses on previous researches that have been carried out to investigate the effect of MK and nanosilica on the properties of mortar and concrete.

Research paper thumbnail of Machine learning algorithms in wood ash-cement-Nano TiO2-based mortar subjected to elevated temperatures

Research paper thumbnail of Early strength development assessment of concrete produced from cement replaced with nano silica activated Corn Cob Ash

Materials Today: Proceedings

Research paper thumbnail of Investigation on thermal properties of rice husk ash-blended palm kernel shell concrete

Environmental Challenges, 2021

Abstract The contribution of buildings to climate change as a result of energy consumption and gr... more Abstract The contribution of buildings to climate change as a result of energy consumption and greenhouse gas emissions necessitates the use of agro-industrial by-products as alternative construction materials. The present study examines the thermal properties of Rice husk ash-blended Palm Kernel Shell Concrete (RHA-blended PKSC). Three control concrete mixes with mix ratios of 1:1½:3, 1:2:4 and 1:3:6 using water-to-cement (w/c) ratios of 0.5, 0.6 and 0.7, respectively were made with cement, river sand and granite. For each mix ratio with the respective w/c ratio, five concrete mixes containing RHA fixed at 15% as replacement for cement and PKS at 20, 40, 60, 80 and 100% as replacement for crushed granite were produced. The oven-dry density, compressive strength and thermal properties (thermal conductivity, thermal diffusivity, volumetric heat capacity and thermal resistivity) were determined. The results showed that the oven-dry density and compressive strength of concrete declined with increasing PKS content. Nevertheless, the compressive strength increased with curing age and the gain in strength of RHA-blended PKSC were higher than the control at the later age. The thermal conductivity and diffusivity decreased with increasing PKS contents but increase with curing age while volumetric heat capacity and thermal resistivity increased as PKS content increases but decreased with curing age. In addition, concrete with 1:3:6 mix ratio exhibited the lowest thermal conductivity and diffusivity but higher volumetric heat capacity and thermal resistivity than those with 1:1½:3, 1:2:4 mix ratios. RHA-blended PKSC with 40% PKS and 15% RHA for 1:1½:3 mix ratio attained the compressive strength and thermal conductivity values recommended for lightweight aggregate concrete which is suitable for structural and insulation purposes. It was concluded that the combined use of PKS and RHA as raw materials in concrete is effective in improving concrete's thermal and insulation properties.

Research paper thumbnail of Flexural Strength Characteristics of Beams Reinforced with Fan Palm under Various Exposure Conditions

Innovative Systems Design and Engineering, 2015

The relative high cost of man-made imported fibres like, glass, steel and plastics used in cement... more The relative high cost of man-made imported fibres like, glass, steel and plastics used in cement based composites as reinforcement calls for investigation into the use of locally available natural fibre as a substitute. Fan palm is locally available and has been studied as a suitable alternative to steel reinforcement. The need for durability of the fan palm under varying exposure conditions is the concern of this study. The ultimate flexural strength of beams reinforced with fan palm under diverse exposure conditions was determined to evaluate its possible usage, both on short and long term basis. Fan palm specimens were cut, shaped to desired flexural reinforcements sizes and coated with water repellants (epoxy, sulphur and bitumen) and blocking agents (hydroxylamine, sodium sulphate magnesium sulphate) for 24 hours. They were then used as reinforcements for concrete beams (75 x 100 x 500 mm) of 1:2:4 mix ratio and cured in alkaline media (0.1N sodium hydroxide solution). Two se...

Research paper thumbnail of Characterisation of Lateritic Soil from Selected Locations along Ibadan – Oyo Expressway for Highway Pavement Construction

LAUTECH Journal of Civil and Environmental Studies, 2018

A good understanding of the engineering properties of lateritic soil is highly essential for effe... more A good understanding of the engineering properties of lateritic soil is highly essential for effective use of the soil for highway pavement construction. The alarming rate of highway pavement failures within the study area has been attributed to paucity of information on the properties of the soil within the study zone. Therefore, the lateritic soils along selected locations along Ibadan – Oyo were characterised for their suitability for highway construction. Ten (10) lateritic soil samples were collected and they were labelled Trial Pit (TP) 1 to 10. The samples were subjected to the following laboratory tests: Sieve analysis, Liquid Limit (LL), Plastic Limit (PL), and Shrinkage Limit (SL), British Standard (BS), West African Standard (WAS), Modified AASHTO compaction and California bearing ratio. The samples were classified using AASHTO classification system. The results of the sieve analyses for percentage passing the 75 m ranged from 15.6 – 33.7%, LL, PL and SL ranged from 30.1 ...

Research paper thumbnail of A study of thermal conductivity of wood ash blended cement mortar

Research paper thumbnail of Influence of Nanosilica on Workability and Compressive Strength of Wood Ash Cement Concrete

LAUTECH Journal of Civil and Environmental Studies, 2019

Studies have revealed that wood ash cement concrete just like other pozzolanic cement concrete ha... more Studies have revealed that wood ash cement concrete just like other pozzolanic cement concrete has lower early strength compared to plain cement concrete. Nanoparticles have been found to improve the early strength of concrete due to its small size and large surface area. This paper reports the influence of nanosilica on the workability and compressive strength of wood ash cement concrete. Wood ash was obtained as a waste product from Ladoke Akintola University of Technology (LAUTECH) bread bakery, Ogbomoso. Biological synthesis of nanosilica using kola Pod extract and silica precursor (1:5) was conducted at Nanotechnology research group laboratory at LAUTECH. The chemical composition, specific gravity and particle size distribution of wood ash, fine and coarse aggregate used were determined. Concrete with 10% wood ash replacement for cement was produced using1:2:4mix proportion and water to binder ratio of 0.5.Nanosilica was added at 0.5, 1.0, 1.5 and 2.0% levels. Concrete with no ...

Research paper thumbnail of Investigation of Workability and Compressive Strength of Wood Ash Cement Concrete Containing Nanosilica

Advanced Materials Research, 2019

Studies have revealed that wood ash cement concrete just like other pozzolanic cement concrete ha... more Studies have revealed that wood ash cement concrete just like other pozzolanic cement concrete has lower early strength compared to plain cement concrete. Nanoparticles have been found to improve the early strength of concrete due to its small size and large surface area. This paper reports the findings on influence of nanosilica on the workability and compressive strength of wood ash cement concrete. Wood ash was obtained as a waste product from Ladoke Akintola University of Technology (LAUTECH) bread bakery, Ogbomoso. Biological synthesis of nanosilica using kola pod extract and silica precursor (1:5) was conducted at Nanotechnology research group laboratory at LAUTECH. The chemical composition, specific gravity and grading of wood ash, fine and coarse aggregate used were determined. Concrete with 10% wood ash replacement for cement was produced using 1:2:4 mix proportion and water to binder ratio of 0.5. Nanosilica was added at 0.5, 1.0, 1.5 and 2.0% levels. Concrete with no wood...

Research paper thumbnail of Economic Exploitation of Gravel in Place of Granite in Concrete Production

Materials Science Forum, 2016

The paper investigated the application of gravel as partial economic replacement of granite in co... more The paper investigated the application of gravel as partial economic replacement of granite in concrete production. Concrete was produced using granite/gravel combination in varying percentages of 90/10, 80/20, 70/30, 60/40, 50/50, 40/60, 30/70, 20/80 and 10/90. Concrete made from 100 % granite and 100 % gravel served controls while other constituents of concrete were kept constant. Two different mix ratios of 1:2:4 and 1:3:6 were employed. Sieve analysis was carried out on the aggregates, while slump and compaction factor tests were carried out on fresh concrete. Compressive strength tests were performed on hardened concrete. Specimens were produced using 150 mm cubes for compressive tests. The reliable percentage of granite/gravel combination from compressive strength view point 60/40 with a value of 21.15 N/mm2 for mix ratios 1:2:4 and 70/30 with 15.17 N/mm2 for 1:3:6 mix ratio at 28 days. Satisfying respectively the 20 N/mm2 and 15.17 N/mm2 minimum requirement of BS 8110: 1997.T...