Marva Blankson - Profile on Academia.edu (original) (raw)

Papers by Marva Blankson

Construction and Building Materials, 2017

h i g h l i g h t s Monitoring damage and deformation on the concrete column. Crack profiles by m... more h i g h l i g h t s Monitoring damage and deformation on the concrete column. Crack profiles by means of 3D image analysis and fractal theory. Composites with carbon nanofibre, carbon fibre and steel fibre. Carbon nanofibre maintains the compactness in a fractured concrete.

Micro-Mechanical and 3D Fractal Analysis, Durability, and Thermal Behaviour of Nano-Modified Cementitious Lightweight Composites for Building Facades

Buildings, 2021

There are increasing research endeavours on the application of nanotechnology in the construction... more There are increasing research endeavours on the application of nanotechnology in the construction industry and lightweight composites. In this study, the influence of different percentage (1%, 2%, and 3% by weight of cement) colloidal nano-silica particles on the mechanical, thermal, and durability properties of lightweight cementitious composites was studied through measurement of compressive strength, flexural response, micro-hardness measurement, pore structure analysis, thermal conductivity, water permeability, and chloride penetration. Moreover, 3D X-ray Compute Tomography together with digital image analysis and 3D fractal analysis was used to characterize the nano-silica, micro-structures, and the fracture surfaces. The experimental results show that incorporating nano-silica particles resulted in a mechanical strength increase up to 45.4 % and a water permeability and chloride migration decrease up to 51.2% and 48.2%, respectively. The micro-structural and 3D fractal analysi...

Investigation of Bond between Fibre Reinforced Polymer (FRP) Composites Rebar and Aramid Fibre-Reinforced Concrete

International Journal of Composite Materials, 2015

This paper reports on a study of the bond between Aramid fibre-reinforced concrete (AF) and glass... more This paper reports on a study of the bond between Aramid fibre-reinforced concrete (AF) and glass fibre reinforced polymer (GFRP) rebars. Three types of GFRP rebars were used, namely, ribbed, helically deformed, and sand-coated bars. Traditional concrete was used as the reference cementitious material. Comparative analysis showed that the compressive strength of the Aramid fibre concrete was lower than that of the traditional concrete and this was attributed to the flocculation of the fibres in the concrete. Conversely, the impact strength of the AF was superior to that of reference concrete. A comparison of the bond strength in the GFRP-reinforced control and the GFRP-reinforced AF concrete samples showed that the introduction of the GFRP rebars in the latter produced mixed results. That is, the bond strength between the concrete and the ribbed bars was increased when Aramid fibres were used. However, the addition of Aramid fibres to the concrete did not increase the bond strength ...

Based on normal strength concrete and high strength concrete, with compressive strengths o f 30 a... more Based on normal strength concrete and high strength concrete, with compressive strengths o f 30 and 50 MPa respectively, damage to concrete under elevated temperatures was studied. After exposures to temperatures up to 500 ˚C, impact resistance, compressive strength, density and ultrasonic pulse velocity of the mixtures were determined. In addition; a statistical programme was used to establish a relationship between the impact strength and the compressive strength and tempe rature of the two types of concrete. The results indicate that the compressive strength of the concretes decreased as the temperature of the concrete increased but the percentage decline in the residual compressive strength is much higher in the high stre ngth concrete than in the normal strength concrete. Further, for both high strength and normal strength concrete samples, the percentage loss in the residual strength with rise in temperature was greater in the impact strength than in the compression strength. F inally, it was found from the statistical analysis that there was a very strong inverse relationship (R<-0.9) between the impact strength and temperature of both high strength and normal strength concrete samples.

The use of waste materials and industrial by-products in high-strength concrete could increase th... more The use of waste materials and industrial by-products in high-strength concrete could increase the sustainability of the construction industry. In this study, the potential of using copper slag as coarse aggregate in high-strength concrete was experimentally investigated. The effects of replacing gravel coarse aggregate by copper slag particles on the compressive strength, chloride ion- migration, water permeability and impact resistance of highstrength concretes were evaluated. Incorporating copper slag coarse particles resulted in a compressive strength increase of about 14 % on average partly due to the low Ca/Si ratio through the interface area of this concrete (more homogenous internal structure) as confirmed by the energy dispersive X-ray micro chemical analysis. It was also found that the copper slag high-strength concrete provided better ductility and had much greater load carrying capacity compared to gravel high-strength concrete under dynamic conditions. Finally, it was o...

Proceedings of the 17th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Industry, Innovation, and Infrastructure for Sustainable Cities and Communities”

Rubber particles in the form of crumb and shredded rubber have been considered for use in concret... more Rubber particles in the form of crumb and shredded rubber have been considered for use in concrete as artificial aggregate. Several investigations have been conducted by previous researchers but most have not conducted comparative studies between shredded and crumb rubber and hence the effects that each type of rubber has on concrete have been investigated in this research. The results of this research show that the use of shredded and crumb rubber as fine aggregate replacement in traditional concrete reduces compressive and flexural strength of concrete and the propensity for water absorption. While the crumb rubber did not increase the impact resistance of concrete, the shredded rubber significantly delays crack initiation and failure from impact forces. Resistance to wear was increased, especially with the crumb rubber.

This research was undertaken to investigate the effectiveness of carboxylic corrosion inhibitor i... more This research was undertaken to investigate the effectiveness of carboxylic corrosion inhibitor in fly ash and silica fume (respectively FM and SM) samples and nitrite-based corrosion inhibitors in fly ash (FOe) sample. The findings from this research show that the addition of the carboxylic inhibitor altered the hydration of fly ash and silica fume selfcompaction concretes (Sees) by delaying the formation of ettmgite and the production of vi DECLARATION The work described in this thesis was conducted at the Department of the Civil Engineering, University of Nottingham between October 2008 and October 2011. I declare that the work is my own and has not been submitted to any other university for a degree.

Comparison of the effect of organic and inorganic corrosion inhibitors on the rheology of self-compacting concrete

Construction and Building Materials, 2015

ABSTRACT

Environmental performance and mechanical analysis of concrete containing recycled asphalt pavement (RAP) and waste precast concrete as aggregate

Journal of Hazardous Materials, 2014

The overall objective of this research project was to investigate the feasibility of incorporatin... more The overall objective of this research project was to investigate the feasibility of incorporating 100% recycled aggregates, either waste precast concrete or waste asphalt planning, as replacements for virgin aggregates in structural concrete and to determine the mechanical and environmental performance of concrete containing these aggregates. Four different types of concrete mixtures were designed with the same total water cement ratio (w/c=0.74) either by using natural aggregate as reference or by totally replacing the natural aggregate with recycled material. Ground granulated blast furnace slag (GGBS) was used as a mineral addition (35%) in all mixtures. The test results showed that it is possible to obtain satisfactory performance for strength characteristics of concrete containing recycled aggregates, if these aggregates are sourced from old precast concrete. However, from the perspective of the mechanical properties, the test results indicated that concrete with RAP aggregate cannot be used for structural applications. In terms of leaching, the results also showed that the environmental behaviour of the recycled aggregate concrete is similar to that of the natural aggregate concrete.

Fractal–fracture analysis and characterization of impact-fractured surfaces in different types of concrete using digital image analysis and 3D nanomap laser profilometery

Construction and Building Materials, 2013

ABSTRACT

Physico-mechanical, microstructural and dynamic properties of newly developed artificial fly ash based lightweight aggregate – Rubber concrete composite

Composites Part B: Engineering, 2015

ABSTRACT

This paper examines the effectiveness of cements standards in promoting qualities that will mitig... more This paper examines the effectiveness of cements standards in promoting qualities that will mitigate deleterious effects in concrete. This objective is achieved through an examination of the potential harmful effects of some properties of cement and a determination of the adequacy of the standard in minimising harmful effects of these properties through limitation of the constituents in the cement. The scope of the discourse is limited to the chemical properties of ordinary Portland cement (OPC) and blended cements. Comparisons of the provisions for the chemical composition of these cements were made with the British standard (BS EN 197) and the American standards (ASTM C150 and C595). In some instances, comparison of the specification on OPC was also made with the Australian standard (AS 3972) in some instances.

Construction and Building Materials, 2017

h i g h l i g h t s Monitoring damage and deformation on the concrete column. Crack profiles by m... more h i g h l i g h t s Monitoring damage and deformation on the concrete column. Crack profiles by means of 3D image analysis and fractal theory. Composites with carbon nanofibre, carbon fibre and steel fibre. Carbon nanofibre maintains the compactness in a fractured concrete.

Micro-Mechanical and 3D Fractal Analysis, Durability, and Thermal Behaviour of Nano-Modified Cementitious Lightweight Composites for Building Facades

Buildings, 2021

There are increasing research endeavours on the application of nanotechnology in the construction... more There are increasing research endeavours on the application of nanotechnology in the construction industry and lightweight composites. In this study, the influence of different percentage (1%, 2%, and 3% by weight of cement) colloidal nano-silica particles on the mechanical, thermal, and durability properties of lightweight cementitious composites was studied through measurement of compressive strength, flexural response, micro-hardness measurement, pore structure analysis, thermal conductivity, water permeability, and chloride penetration. Moreover, 3D X-ray Compute Tomography together with digital image analysis and 3D fractal analysis was used to characterize the nano-silica, micro-structures, and the fracture surfaces. The experimental results show that incorporating nano-silica particles resulted in a mechanical strength increase up to 45.4 % and a water permeability and chloride migration decrease up to 51.2% and 48.2%, respectively. The micro-structural and 3D fractal analysi...

Investigation of Bond between Fibre Reinforced Polymer (FRP) Composites Rebar and Aramid Fibre-Reinforced Concrete

International Journal of Composite Materials, 2015

This paper reports on a study of the bond between Aramid fibre-reinforced concrete (AF) and glass... more This paper reports on a study of the bond between Aramid fibre-reinforced concrete (AF) and glass fibre reinforced polymer (GFRP) rebars. Three types of GFRP rebars were used, namely, ribbed, helically deformed, and sand-coated bars. Traditional concrete was used as the reference cementitious material. Comparative analysis showed that the compressive strength of the Aramid fibre concrete was lower than that of the traditional concrete and this was attributed to the flocculation of the fibres in the concrete. Conversely, the impact strength of the AF was superior to that of reference concrete. A comparison of the bond strength in the GFRP-reinforced control and the GFRP-reinforced AF concrete samples showed that the introduction of the GFRP rebars in the latter produced mixed results. That is, the bond strength between the concrete and the ribbed bars was increased when Aramid fibres were used. However, the addition of Aramid fibres to the concrete did not increase the bond strength ...

Based on normal strength concrete and high strength concrete, with compressive strengths o f 30 a... more Based on normal strength concrete and high strength concrete, with compressive strengths o f 30 and 50 MPa respectively, damage to concrete under elevated temperatures was studied. After exposures to temperatures up to 500 ˚C, impact resistance, compressive strength, density and ultrasonic pulse velocity of the mixtures were determined. In addition; a statistical programme was used to establish a relationship between the impact strength and the compressive strength and tempe rature of the two types of concrete. The results indicate that the compressive strength of the concretes decreased as the temperature of the concrete increased but the percentage decline in the residual compressive strength is much higher in the high stre ngth concrete than in the normal strength concrete. Further, for both high strength and normal strength concrete samples, the percentage loss in the residual strength with rise in temperature was greater in the impact strength than in the compression strength. F inally, it was found from the statistical analysis that there was a very strong inverse relationship (R<-0.9) between the impact strength and temperature of both high strength and normal strength concrete samples.

The use of waste materials and industrial by-products in high-strength concrete could increase th... more The use of waste materials and industrial by-products in high-strength concrete could increase the sustainability of the construction industry. In this study, the potential of using copper slag as coarse aggregate in high-strength concrete was experimentally investigated. The effects of replacing gravel coarse aggregate by copper slag particles on the compressive strength, chloride ion- migration, water permeability and impact resistance of highstrength concretes were evaluated. Incorporating copper slag coarse particles resulted in a compressive strength increase of about 14 % on average partly due to the low Ca/Si ratio through the interface area of this concrete (more homogenous internal structure) as confirmed by the energy dispersive X-ray micro chemical analysis. It was also found that the copper slag high-strength concrete provided better ductility and had much greater load carrying capacity compared to gravel high-strength concrete under dynamic conditions. Finally, it was o...

Proceedings of the 17th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Industry, Innovation, and Infrastructure for Sustainable Cities and Communities”

Rubber particles in the form of crumb and shredded rubber have been considered for use in concret... more Rubber particles in the form of crumb and shredded rubber have been considered for use in concrete as artificial aggregate. Several investigations have been conducted by previous researchers but most have not conducted comparative studies between shredded and crumb rubber and hence the effects that each type of rubber has on concrete have been investigated in this research. The results of this research show that the use of shredded and crumb rubber as fine aggregate replacement in traditional concrete reduces compressive and flexural strength of concrete and the propensity for water absorption. While the crumb rubber did not increase the impact resistance of concrete, the shredded rubber significantly delays crack initiation and failure from impact forces. Resistance to wear was increased, especially with the crumb rubber.

This research was undertaken to investigate the effectiveness of carboxylic corrosion inhibitor i... more This research was undertaken to investigate the effectiveness of carboxylic corrosion inhibitor in fly ash and silica fume (respectively FM and SM) samples and nitrite-based corrosion inhibitors in fly ash (FOe) sample. The findings from this research show that the addition of the carboxylic inhibitor altered the hydration of fly ash and silica fume selfcompaction concretes (Sees) by delaying the formation of ettmgite and the production of vi DECLARATION The work described in this thesis was conducted at the Department of the Civil Engineering, University of Nottingham between October 2008 and October 2011. I declare that the work is my own and has not been submitted to any other university for a degree.

Comparison of the effect of organic and inorganic corrosion inhibitors on the rheology of self-compacting concrete

Construction and Building Materials, 2015

ABSTRACT

Environmental performance and mechanical analysis of concrete containing recycled asphalt pavement (RAP) and waste precast concrete as aggregate

Journal of Hazardous Materials, 2014

The overall objective of this research project was to investigate the feasibility of incorporatin... more The overall objective of this research project was to investigate the feasibility of incorporating 100% recycled aggregates, either waste precast concrete or waste asphalt planning, as replacements for virgin aggregates in structural concrete and to determine the mechanical and environmental performance of concrete containing these aggregates. Four different types of concrete mixtures were designed with the same total water cement ratio (w/c=0.74) either by using natural aggregate as reference or by totally replacing the natural aggregate with recycled material. Ground granulated blast furnace slag (GGBS) was used as a mineral addition (35%) in all mixtures. The test results showed that it is possible to obtain satisfactory performance for strength characteristics of concrete containing recycled aggregates, if these aggregates are sourced from old precast concrete. However, from the perspective of the mechanical properties, the test results indicated that concrete with RAP aggregate cannot be used for structural applications. In terms of leaching, the results also showed that the environmental behaviour of the recycled aggregate concrete is similar to that of the natural aggregate concrete.

Fractal–fracture analysis and characterization of impact-fractured surfaces in different types of concrete using digital image analysis and 3D nanomap laser profilometery

Construction and Building Materials, 2013

ABSTRACT

Physico-mechanical, microstructural and dynamic properties of newly developed artificial fly ash based lightweight aggregate – Rubber concrete composite

Composites Part B: Engineering, 2015

ABSTRACT

This paper examines the effectiveness of cements standards in promoting qualities that will mitig... more This paper examines the effectiveness of cements standards in promoting qualities that will mitigate deleterious effects in concrete. This objective is achieved through an examination of the potential harmful effects of some properties of cement and a determination of the adequacy of the standard in minimising harmful effects of these properties through limitation of the constituents in the cement. The scope of the discourse is limited to the chemical properties of ordinary Portland cement (OPC) and blended cements. Comparisons of the provisions for the chemical composition of these cements were made with the British standard (BS EN 197) and the American standards (ASTM C150 and C595). In some instances, comparison of the specification on OPC was also made with the Australian standard (AS 3972) in some instances.