Mohammed Rizwan Ali | KFUPM (original) (raw)
Papers by Mohammed Rizwan Ali
Case Studies in Construction Materials, 2022
Journal of Materials Research and Technology, 2021
Abstract Crumb rubber has been used since sometime to improve the impact and toughness of normall... more Abstract Crumb rubber has been used since sometime to improve the impact and toughness of normally brittle concrete. As the failure due to fatigue and impact loadings is a problem in normal concrete; the flexibility of the rubber aggregates could be the key to solve it. Even though there is a marginal reduction in the mechanical properties of crumb rubber concrete, this can be overcome by appropriate treatment of the crumb rubber aggregates. Methods, such as mechanical, chemical, thermal and microwave treatment could be used to treat crumb rubber aggregates to enhance their adhesion with the cement mortar. This is desirable since a significant positive impact on the environment could be achieved by utilizing crumb rubber from scrap tires in concrete resulting in the solution of their disposal problems and conserving the depleting sources of natural aggregates. Even though some literature on the properties of crumb rubber concrete is available, there is a need to evaluate methods to overcome the deficiencies of crumb rubber concrete. This paper is a state-of-the-art review on the mechanical, durability, thermal, and acoustic properties of concrete incorporating untreated- and treated-crumb rubber. The beneficial treatment methods have been categorized. It is hoped that this review will encourage the use of crumb rubber concrete in the construction of infrastructure and form a basis for further research on this material. The use of crumb rubber concrete will lead to a sustainable utilization of a waste material, leading to environmental protection and conservation of depleting sources of natural aggregates.
Construction and Building Materials, 2018
h i g h l i g h t s Polyethylene beads were utilized to develop thermal insulating lightweight co... more h i g h l i g h t s Polyethylene beads were utilized to develop thermal insulating lightweight concrete (TI-LWC). TI-LWC specimens were tested to assess their strength and thermal properties and durability. The unit weight, strength and durability were within the acceptable limits for LWC. The thermal resistance of the developed TI-LWC was very high indicating its usefulness in energy conservation.
Journal of Composites for Construction, 2016
Reinforcement corrosion is considered to be the major contributor to the deterioration of concret... more Reinforcement corrosion is considered to be the major contributor to the deterioration of concrete. It is caused either due to carbonation or the diffusion of chloride ions to the steel surface. However, chloride-induced reinforcement corrosion significantly outweighs that due to carbonation of concrete. Though the role played by the chloride ions in initiating reinforcement corrosion is not very clear, limitations are placed on their quantity from the perspective of inhibiting reinforcement corrosion. However, these limitations do not consider the effect of sulfate ions on the chloride threshold. Also, the quality of concrete has improved significantly since the threshold values were established by international standards and codes of practices. Consequently, there is a need to establish chloride threshold values for avoiding concrete deterioration due to reinforcement corrosion. This paper presents results of a study conducted to evaluate the chloride threshold values for high qua...
Instances of concrete deterioration, due to its interaction with the service-environment, have be... more Instances of concrete deterioration, due to its interaction with the service-environment, have been reported from several regions of the world. Concrete deterioration in the countries with a cold climate has been attributed to freeze-thaw action or reinforcement corrosion due to the use of deicer salts. In the hot weather conditions of the Arabian Gulf, concrete deterioration is mainly due to accelerated reinforcement corrosion. Other forms of concrete deterioration, such as sulfate attack, salt weathering and cracking due to plastic and drying shrinkage, are also reported. However, the extent of deterioration due to reinforcement corrosion out weighs that due to other reasons. Studies have been conducted at the authors’ institution to develop materials that are compatible with the service environment and helpful in achieving the desired service life of structures for the local conditions. This paper reviews the outcome of studies conducted by the authors to develop materials and te...
This paper reports results of a study conducted to assess the properties of cement kiln dust (CKD... more This paper reports results of a study conducted to assess the properties of cement kiln dust (CKD) blended cement concretes. Type I and Type V cement concrete specimens were prepared with 0, 5, 10, and 15% CKD, used as a replacement of cement. The physical properties of CKD concrete specimens were evaluated by measuring compressive strength while the durability characteristics were assessed by evaluating chloride permeability and electrical resistivity. The compressive strength of CKD cement concrete decreased with the quantity of CKD. However, there was no significant difference in the compressive strength of 0 and 5% CKD cement concretes. The chloride permeability increased and the electrical resistivity decreased due to the incorporation of CKD. However, the performance of concrete with 5% CKD was almost similar to that of concrete without CKD. Therefore, it is suggested to limit the amount of CKD in concrete to 5% since the chloride permeability and electrical resistivity data i...
Infrared Physics & Technology, 2012
Construction and Building Materials, 2013
ABSTRACT This paper reports the results of a study conducted to assess the effect of curing on sh... more ABSTRACT This paper reports the results of a study conducted to assess the effect of curing on shrinkage and corrosion resistance of OPC and silica fume cement concretes. The concrete specimens were cured by covering with wet burlap or applying one of the following curing compounds, water-, acrylic-, bitumen-based, or coal tar epoxy. The results indicated that the selected curing compounds were effective in decreasing the shrinkage strain and enhancing the corrosion resistance of both OPC and silica fume cement concretes. It was also noted that 3 days of wet burlap curing prior to the application of a curing compound was necessary for the OPC concrete while 7 days of wet burlap curing is required for the silica fume cement concrete.
Construction and Building Materials, 2009
... Mohamed Al-Mehthel a , Salah Al-Dulaijan b , Saleh H. Al-Idi a , MohammedShameem b , MR Ali b... more ... Mohamed Al-Mehthel a , Salah Al-Dulaijan b , Saleh H. Al-Idi a , MohammedShameem b , MR Ali b and Mohammed Maslehuddin b , Corresponding Author Contact Information , E-mail The Corresponding Author. ... Malik et al. ...
Construction and Building Materials, 2009
This paper reports results of a study conducted to assess the properties of cement kiln dust (CKD... more This paper reports results of a study conducted to assess the properties of cement kiln dust (CKD) blended cement concretes. Cement concrete specimens were prepared with 0%, 5%, 10%, and 15% CKD, replacing ASTM C 150 Type I and Type V. The mechanical ...
Construction and Building Materials, 2011
... M. Maslehuddin a , Corresponding Author Contact Information , E-mail The Corresponding Author... more ... M. Maslehuddin a , Corresponding Author Contact Information , E-mail The Corresponding Author , FR Awan b , M. Shameem a , M. Ibrahim a and MR Ali a. a King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia. ...
Advances in Cement Research, 2007
The sulphate resistance of plain (ASTM C150 Type I and Type V) cements and cements blended with s... more The sulphate resistance of plain (ASTM C150 Type I and Type V) cements and cements blended with silica fume, fly ash, blast furnace slag or Superpozz, a new generation of supplementary cementing materials, exposed to sodium sulphate solutions was evaluated in this study. Cement mortar specimens were exposed to sulphate concentrations of up to 25 000 ppm. The sulphate resistance of the selected cements was evaluated by visual examination and measuring expansion and reduction in the compressive strength. Morphological changes in cements, due to sulphate exposure, were evaluated by scanning electron microscopy. The mineralogical changes in cements exposed to a solution with 15 000 ppm sulphate were evaluated. Cracks were noted in Type I and silica fume cement mortar specimens exposed to a sulphate concentration of 15 000 ppm or more. In Type V cement, the sulphate tolerance was 25 000 ppm. Cracks were not noted in the blast furnace slag, fly ash, and Superpozz cement mortar specimens e...
Construction and Building Materials, 2020
Abstract The aim of this research was to reduce the demand for air conditioning in buildings by m... more Abstract The aim of this research was to reduce the demand for air conditioning in buildings by minimizing the heat flow from outdoor environment to the interior of building envelopes (walls and roofs). Hence, a finite element model (FEM) was developed to find out the optimum geometry of cavities and their layout in masonry concrete blocks in order to reduce the thermal flow of heat and the results were compared with that of hollow blocks available in the market in terms of thermal insulation. Results of the simulation were promising and indicated that the new “optimum” designed geometry of hollow blocks was much better than the hollow blocks available in the market. Thereafter, some insulation materials were utilized in the concrete mixtures to produce hollow masonry concrete blocks to reduce the thermal conductivity through wall elements. Experimentally, the results of the new block with optimum geometry without the insulation materials showed improved thermal insulation by as much as 71% compared to other designs of hollow blocks including those available in the market. The thermal resistance of concrete and masonry blocks with the insulation materials (perlite, rubber and polyethylene) was enticing and significant. The newly developed optimum design of masonry concrete block with and without the insulation materials satisfied the ASTM C129 requirements for non-load bearing walls in terms of strength and absorption and was considered as medium weight (without insulation material) and as lightweight (with insulation materials) masonry hollow blocks. Results of this comprehensive investigation also indicated that the thermal conductivity could be reduced by up to 40% compared to that of the conventional blocks available in the market. Therefore, it is recommended that these optimum designed blocks be utilized by the construction industry in order to reduce the amount of energy used for the air conditioning as well as the carbon footprrint.
Case Studies in Construction Materials, 2022
Journal of Materials Research and Technology, 2021
Abstract Crumb rubber has been used since sometime to improve the impact and toughness of normall... more Abstract Crumb rubber has been used since sometime to improve the impact and toughness of normally brittle concrete. As the failure due to fatigue and impact loadings is a problem in normal concrete; the flexibility of the rubber aggregates could be the key to solve it. Even though there is a marginal reduction in the mechanical properties of crumb rubber concrete, this can be overcome by appropriate treatment of the crumb rubber aggregates. Methods, such as mechanical, chemical, thermal and microwave treatment could be used to treat crumb rubber aggregates to enhance their adhesion with the cement mortar. This is desirable since a significant positive impact on the environment could be achieved by utilizing crumb rubber from scrap tires in concrete resulting in the solution of their disposal problems and conserving the depleting sources of natural aggregates. Even though some literature on the properties of crumb rubber concrete is available, there is a need to evaluate methods to overcome the deficiencies of crumb rubber concrete. This paper is a state-of-the-art review on the mechanical, durability, thermal, and acoustic properties of concrete incorporating untreated- and treated-crumb rubber. The beneficial treatment methods have been categorized. It is hoped that this review will encourage the use of crumb rubber concrete in the construction of infrastructure and form a basis for further research on this material. The use of crumb rubber concrete will lead to a sustainable utilization of a waste material, leading to environmental protection and conservation of depleting sources of natural aggregates.
Construction and Building Materials, 2018
h i g h l i g h t s Polyethylene beads were utilized to develop thermal insulating lightweight co... more h i g h l i g h t s Polyethylene beads were utilized to develop thermal insulating lightweight concrete (TI-LWC). TI-LWC specimens were tested to assess their strength and thermal properties and durability. The unit weight, strength and durability were within the acceptable limits for LWC. The thermal resistance of the developed TI-LWC was very high indicating its usefulness in energy conservation.
Journal of Composites for Construction, 2016
Reinforcement corrosion is considered to be the major contributor to the deterioration of concret... more Reinforcement corrosion is considered to be the major contributor to the deterioration of concrete. It is caused either due to carbonation or the diffusion of chloride ions to the steel surface. However, chloride-induced reinforcement corrosion significantly outweighs that due to carbonation of concrete. Though the role played by the chloride ions in initiating reinforcement corrosion is not very clear, limitations are placed on their quantity from the perspective of inhibiting reinforcement corrosion. However, these limitations do not consider the effect of sulfate ions on the chloride threshold. Also, the quality of concrete has improved significantly since the threshold values were established by international standards and codes of practices. Consequently, there is a need to establish chloride threshold values for avoiding concrete deterioration due to reinforcement corrosion. This paper presents results of a study conducted to evaluate the chloride threshold values for high qua...
Instances of concrete deterioration, due to its interaction with the service-environment, have be... more Instances of concrete deterioration, due to its interaction with the service-environment, have been reported from several regions of the world. Concrete deterioration in the countries with a cold climate has been attributed to freeze-thaw action or reinforcement corrosion due to the use of deicer salts. In the hot weather conditions of the Arabian Gulf, concrete deterioration is mainly due to accelerated reinforcement corrosion. Other forms of concrete deterioration, such as sulfate attack, salt weathering and cracking due to plastic and drying shrinkage, are also reported. However, the extent of deterioration due to reinforcement corrosion out weighs that due to other reasons. Studies have been conducted at the authors’ institution to develop materials that are compatible with the service environment and helpful in achieving the desired service life of structures for the local conditions. This paper reviews the outcome of studies conducted by the authors to develop materials and te...
This paper reports results of a study conducted to assess the properties of cement kiln dust (CKD... more This paper reports results of a study conducted to assess the properties of cement kiln dust (CKD) blended cement concretes. Type I and Type V cement concrete specimens were prepared with 0, 5, 10, and 15% CKD, used as a replacement of cement. The physical properties of CKD concrete specimens were evaluated by measuring compressive strength while the durability characteristics were assessed by evaluating chloride permeability and electrical resistivity. The compressive strength of CKD cement concrete decreased with the quantity of CKD. However, there was no significant difference in the compressive strength of 0 and 5% CKD cement concretes. The chloride permeability increased and the electrical resistivity decreased due to the incorporation of CKD. However, the performance of concrete with 5% CKD was almost similar to that of concrete without CKD. Therefore, it is suggested to limit the amount of CKD in concrete to 5% since the chloride permeability and electrical resistivity data i...
Infrared Physics & Technology, 2012
Construction and Building Materials, 2013
ABSTRACT This paper reports the results of a study conducted to assess the effect of curing on sh... more ABSTRACT This paper reports the results of a study conducted to assess the effect of curing on shrinkage and corrosion resistance of OPC and silica fume cement concretes. The concrete specimens were cured by covering with wet burlap or applying one of the following curing compounds, water-, acrylic-, bitumen-based, or coal tar epoxy. The results indicated that the selected curing compounds were effective in decreasing the shrinkage strain and enhancing the corrosion resistance of both OPC and silica fume cement concretes. It was also noted that 3 days of wet burlap curing prior to the application of a curing compound was necessary for the OPC concrete while 7 days of wet burlap curing is required for the silica fume cement concrete.
Construction and Building Materials, 2009
... Mohamed Al-Mehthel a , Salah Al-Dulaijan b , Saleh H. Al-Idi a , MohammedShameem b , MR Ali b... more ... Mohamed Al-Mehthel a , Salah Al-Dulaijan b , Saleh H. Al-Idi a , MohammedShameem b , MR Ali b and Mohammed Maslehuddin b , Corresponding Author Contact Information , E-mail The Corresponding Author. ... Malik et al. ...
Construction and Building Materials, 2009
This paper reports results of a study conducted to assess the properties of cement kiln dust (CKD... more This paper reports results of a study conducted to assess the properties of cement kiln dust (CKD) blended cement concretes. Cement concrete specimens were prepared with 0%, 5%, 10%, and 15% CKD, replacing ASTM C 150 Type I and Type V. The mechanical ...
Construction and Building Materials, 2011
... M. Maslehuddin a , Corresponding Author Contact Information , E-mail The Corresponding Author... more ... M. Maslehuddin a , Corresponding Author Contact Information , E-mail The Corresponding Author , FR Awan b , M. Shameem a , M. Ibrahim a and MR Ali a. a King Fahd University of Petroleum and Minerals, Dhahran, Saudi Arabia. ...
Advances in Cement Research, 2007
The sulphate resistance of plain (ASTM C150 Type I and Type V) cements and cements blended with s... more The sulphate resistance of plain (ASTM C150 Type I and Type V) cements and cements blended with silica fume, fly ash, blast furnace slag or Superpozz, a new generation of supplementary cementing materials, exposed to sodium sulphate solutions was evaluated in this study. Cement mortar specimens were exposed to sulphate concentrations of up to 25 000 ppm. The sulphate resistance of the selected cements was evaluated by visual examination and measuring expansion and reduction in the compressive strength. Morphological changes in cements, due to sulphate exposure, were evaluated by scanning electron microscopy. The mineralogical changes in cements exposed to a solution with 15 000 ppm sulphate were evaluated. Cracks were noted in Type I and silica fume cement mortar specimens exposed to a sulphate concentration of 15 000 ppm or more. In Type V cement, the sulphate tolerance was 25 000 ppm. Cracks were not noted in the blast furnace slag, fly ash, and Superpozz cement mortar specimens e...
Construction and Building Materials, 2020
Abstract The aim of this research was to reduce the demand for air conditioning in buildings by m... more Abstract The aim of this research was to reduce the demand for air conditioning in buildings by minimizing the heat flow from outdoor environment to the interior of building envelopes (walls and roofs). Hence, a finite element model (FEM) was developed to find out the optimum geometry of cavities and their layout in masonry concrete blocks in order to reduce the thermal flow of heat and the results were compared with that of hollow blocks available in the market in terms of thermal insulation. Results of the simulation were promising and indicated that the new “optimum” designed geometry of hollow blocks was much better than the hollow blocks available in the market. Thereafter, some insulation materials were utilized in the concrete mixtures to produce hollow masonry concrete blocks to reduce the thermal conductivity through wall elements. Experimentally, the results of the new block with optimum geometry without the insulation materials showed improved thermal insulation by as much as 71% compared to other designs of hollow blocks including those available in the market. The thermal resistance of concrete and masonry blocks with the insulation materials (perlite, rubber and polyethylene) was enticing and significant. The newly developed optimum design of masonry concrete block with and without the insulation materials satisfied the ASTM C129 requirements for non-load bearing walls in terms of strength and absorption and was considered as medium weight (without insulation material) and as lightweight (with insulation materials) masonry hollow blocks. Results of this comprehensive investigation also indicated that the thermal conductivity could be reduced by up to 40% compared to that of the conventional blocks available in the market. Therefore, it is recommended that these optimum designed blocks be utilized by the construction industry in order to reduce the amount of energy used for the air conditioning as well as the carbon footprrint.