The Experts below are selected from a list of 10695 Experts worldwide ranked by ideXlab platform
Min-hong Zhang - One of the best experts on this subject based on the ideXlab platform.
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Water and chloride Ion penetratIon resistance of highstrength ultra lightweight cement composite
2012Co-Authors: Xuemei Liu, Min-hong Zhang, Kok Seng Chia, Jat Yuen LiewAbstract:Durability is a significant issue to focus on for newly developed structural lightweight cement composite (ULCC). This paper presents an experimental study to evaluate the resistance of ULCC to water and chloride Ion penetratIon. Chloride penetrability and sorptivity were evaluated for ULCC (unit weight about 1450 kg/m3) and compared with those of a normal weight concrete (NWC), a lightweight aggregate concrete (LWC), and an ultra lightweight composite with proprietary cementitious binder (DB) (unit weight about 1450 kg/m3) at similar compressive strength of about 60 MPa. Rapid chloride penetrability test, rapid migratIon test, water absorptIon (sorptivity) test, and water permeability test were conducted on these mixtures. Results indicate that ULCC and DB had comparable performance. Compared with control LWC and NWC at similar strength level, the ULCC and DB mixtures had higher resistance to chloride Ion penetratIon, lower water absorptIon and virtually impermeable to water penetratIon.
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Water and chloride Ion penetratIon resistance of high-strength ultra lightweight cement composite
2012Co-Authors: Xuemei Liu, Min-hong Zhang, Kok Seng Chia, Richard J.y. LiewAbstract:Durability is a significant issue to focus on for newly developed structural lightweight cement composite (ULCC). This paper presents an experimental study to evaluate the resistance of ULCC to water and chloride Ion penetratIon. Chloride penetrability and sorptivity were evaluated for ULCC (unit weight about 1450 kg/m3) and compared with those of a normal weight concrete (NWC), a lightweight aggregate concrete (LWC), and an ultra lightweight composite with proprietary cementitious binder (DB) (unit weight about 1450 kg/m3) at similar compressive strength of about 60 MPa. Rapid chloride penetrability test, rapid migratIon test, water absorptIon (sorptivity) test, and water permeability test were conducted on these mixtures. Results indicate that ULCC and DB had comparable performance. Compared with control LWC and NWC at similar strength level, the ULCC and DB mixtures had higher resistance to chloride Ion penetratIon, lower water absorptIon and virtually impermeable to water penetratIon.
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water absorptIon permeability and resistance to chloride Ion penetratIon of lightweight aggregate concrete
Construction and Building Materials, 2011Co-Authors: Kok Seng Chia, Min-hong ZhangAbstract:This paper presents an experimental study to evaluate effect of cumulative lightweight aggregate (LWA) content (including lightweight sand) in concrete [water/cement ratio (w/c) = 0.38] on its water absorptIon, water permeability, and resistance to chloride-Ion penetratIon. Rapid chloride penetrability test (ASTM C 1202), rapid migratIon test (NT Build 492), and salt ponding test (AASHTO T 259) were conducted to evaluate the concrete resistance to chloride-Ion penetratIon. The results were compared with those of a cement paste and a control normal weight aggregate concrete (NWAC) with the same w/c and a NWAC (w/c = 0.54) with 28-day compressive strength similar to some of the lightweight aggregate concrete (LWAC). Results indicate that although the total charge passed, migratIon coefficient, and diffusIon coefficient of the LWAC were not significantly different from those of NWAC with the same w/c of 0.38, resistance of the LWAC to chloride penetratIon decreased with increase in the cumulative LWA content in the concretes. The water penetratIon depth under pressure and water sorptivity showed, in general, similar trends. The LWAC with only coarse LWA had similar water sorptivity, water permeability coefficient, and resistance to chloride-Ion penetratIon compared to NWAC with similar w/c. The LWAC had lower water sorptivity, water permeability and higher resistance to chloride-Ion penetratIon than the NWAC with similar 28-day strength but higher w/c. Both the NWAC and LWAC had lower sorptivity and higher resistance to chloride-Ion penetratIon than the cement paste with similar w/c.
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development of lightweight concrete with high resistance to water and chloride Ion penetratIon
Cement & Concrete Composites, 2010Co-Authors: Xuemei Liu, Kok Seng Chia, Min-hong ZhangAbstract:This paper presents an experimental study to evaluate the influence of coarse lightweight aggregate (LWA), fine LWA and the quality of the paste matrix on water absorptIon and permeability, and resistance to chloride-Ion penetratIon in concrete. The results indicate that incorporatIon of pre-soaked coarse LWA in concrete increases water sorptivity and permeability slightly compared to normal weight concrete (NWC) of similar water-to-cementitious materials ratio (w/cm). Furthermore, resistance of the sand-lightweight concrete (LWC) to water permeability and chloride-Ion penetratIon decreases with an increase in porosity of the coarse LWA. The use of fine LWA including a crushed fractIon <1.18 mm reduced resistance of the all-LWC to water and chloride-Ion penetratIon compared with the sand-LWC which has the same coarse LWA. Overall, the quality of the paste matrix was dominant in controlling the transport properties of the concrete, regardless of porosity of the aggregates used. With low w/cm and silica fume, low unit weight LWC (1300 kg/m3) was produced with a higher resistance to water and chloride-Ion penetratIon compared with NWC and LWC of higher unit weights. (A) Reprinted with permissIon from Elsevier.
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Development of lightweight aggregate concrete with high resistance to water and chloride-Ion penetratIon
Science & Engineering Faculty, 2010Co-Authors: Xuemei Liu, Kong Seng Chia, Min-hong ZhangAbstract:This paper presents an experimental study to evaluate the effect of coarse and fine LWA in concrete on its water absorptIon and permeability, and resistance to chloride-Ion penetratIon. In additIons, LWC with lower unit weight of about 1300 kg/m3 but high resistance to water and chloride-Ion penetratIon was developed and evaluated. The results indicate that the incorporatIon of coarse LWA in concrete increases water sorptivity and permeability slightly compared to NWC of similar w/c. The resistance of the sand-LWC to chloride-Ion penetratIon depends on porosity of the coarse LWA. Fine LWA has more influence on the transport proper-ties of concrete than coarse LWA. Use of lightweight crushed sand
Shunbo Zhao - One of the best experts on this subject based on the ideXlab platform.
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influences of freeze thaw cycle and curing time on chloride Ion penetratIon resistance of sulphoaluminate cement concrete
Construction and Building Materials, 2014Co-Authors: Jun Zhao, Shunbo ZhaoAbstract:Abstract In this paper, the influences of freeze–thaw cycle and curing time on the chloride Ion penetratIon resistance of Portland and Sulphoaluminate cement concretes were researched. Results show that freeze–thaw cycle and curing time have significant influences on chloride Ion penetratIon resistance of the two cement concretes. Although the chloride diffusIon coefficients of the two cement concretes decrease gradually when curing time increases, it is much lower for Sulphoaluminate cement concrete. The chloride diffusIon coefficient and chloride Ion penetratIon depth both increase obviously after the two cement concretes were subjected to the freeze–thaw cycles, which indicates that the freeze–thaw cycles can accelerate the chloride Ion diffusIon into the two concretes. Under the same freeze–thaw cycle and curing time, Sulphoaluminate cement concrete has much better chloride Ion penetratIon resistance than Portland cement concrete. Comparing with Portland cement concrete, the variatIon rates of chloride diffusIon coefficient and chloride Ion penetratIon depth both increase more rapidly for Sulphoaluminate cement concrete after freeze–thaw cycle.
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Influences of freeze–thaw cycle and curing time on chloride Ion penetratIon resistance of Sulphoaluminate cement concrete
Construction and Building Materials, 2014Co-Authors: Jun Zhao, Gaochuang Cai, Danying Gao, Shunbo ZhaoAbstract:Abstract In this paper, the influences of freeze–thaw cycle and curing time on the chloride Ion penetratIon resistance of Portland and Sulphoaluminate cement concretes were researched. Results show that freeze–thaw cycle and curing time have significant influences on chloride Ion penetratIon resistance of the two cement concretes. Although the chloride diffusIon coefficients of the two cement concretes decrease gradually when curing time increases, it is much lower for Sulphoaluminate cement concrete. The chloride diffusIon coefficient and chloride Ion penetratIon depth both increase obviously after the two cement concretes were subjected to the freeze–thaw cycles, which indicates that the freeze–thaw cycles can accelerate the chloride Ion diffusIon into the two concretes. Under the same freeze–thaw cycle and curing time, Sulphoaluminate cement concrete has much better chloride Ion penetratIon resistance than Portland cement concrete. Comparing with Portland cement concrete, the variatIon rates of chloride diffusIon coefficient and chloride Ion penetratIon depth both increase more rapidly for Sulphoaluminate cement concrete after freeze–thaw cycle.
Kok Seng Chia - One of the best experts on this subject based on the ideXlab platform.
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Water and chloride Ion penetratIon resistance of highstrength ultra lightweight cement composite
2012Co-Authors: Xuemei Liu, Min-hong Zhang, Kok Seng Chia, Jat Yuen LiewAbstract:Durability is a significant issue to focus on for newly developed structural lightweight cement composite (ULCC). This paper presents an experimental study to evaluate the resistance of ULCC to water and chloride Ion penetratIon. Chloride penetrability and sorptivity were evaluated for ULCC (unit weight about 1450 kg/m3) and compared with those of a normal weight concrete (NWC), a lightweight aggregate concrete (LWC), and an ultra lightweight composite with proprietary cementitious binder (DB) (unit weight about 1450 kg/m3) at similar compressive strength of about 60 MPa. Rapid chloride penetrability test, rapid migratIon test, water absorptIon (sorptivity) test, and water permeability test were conducted on these mixtures. Results indicate that ULCC and DB had comparable performance. Compared with control LWC and NWC at similar strength level, the ULCC and DB mixtures had higher resistance to chloride Ion penetratIon, lower water absorptIon and virtually impermeable to water penetratIon.
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Water and chloride Ion penetratIon resistance of high-strength ultra lightweight cement composite
2012Co-Authors: Xuemei Liu, Min-hong Zhang, Kok Seng Chia, Richard J.y. LiewAbstract:Durability is a significant issue to focus on for newly developed structural lightweight cement composite (ULCC). This paper presents an experimental study to evaluate the resistance of ULCC to water and chloride Ion penetratIon. Chloride penetrability and sorptivity were evaluated for ULCC (unit weight about 1450 kg/m3) and compared with those of a normal weight concrete (NWC), a lightweight aggregate concrete (LWC), and an ultra lightweight composite with proprietary cementitious binder (DB) (unit weight about 1450 kg/m3) at similar compressive strength of about 60 MPa. Rapid chloride penetrability test, rapid migratIon test, water absorptIon (sorptivity) test, and water permeability test were conducted on these mixtures. Results indicate that ULCC and DB had comparable performance. Compared with control LWC and NWC at similar strength level, the ULCC and DB mixtures had higher resistance to chloride Ion penetratIon, lower water absorptIon and virtually impermeable to water penetratIon.
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water absorptIon permeability and resistance to chloride Ion penetratIon of lightweight aggregate concrete
Construction and Building Materials, 2011Co-Authors: Kok Seng Chia, Min-hong ZhangAbstract:This paper presents an experimental study to evaluate effect of cumulative lightweight aggregate (LWA) content (including lightweight sand) in concrete [water/cement ratio (w/c) = 0.38] on its water absorptIon, water permeability, and resistance to chloride-Ion penetratIon. Rapid chloride penetrability test (ASTM C 1202), rapid migratIon test (NT Build 492), and salt ponding test (AASHTO T 259) were conducted to evaluate the concrete resistance to chloride-Ion penetratIon. The results were compared with those of a cement paste and a control normal weight aggregate concrete (NWAC) with the same w/c and a NWAC (w/c = 0.54) with 28-day compressive strength similar to some of the lightweight aggregate concrete (LWAC). Results indicate that although the total charge passed, migratIon coefficient, and diffusIon coefficient of the LWAC were not significantly different from those of NWAC with the same w/c of 0.38, resistance of the LWAC to chloride penetratIon decreased with increase in the cumulative LWA content in the concretes. The water penetratIon depth under pressure and water sorptivity showed, in general, similar trends. The LWAC with only coarse LWA had similar water sorptivity, water permeability coefficient, and resistance to chloride-Ion penetratIon compared to NWAC with similar w/c. The LWAC had lower water sorptivity, water permeability and higher resistance to chloride-Ion penetratIon than the NWAC with similar 28-day strength but higher w/c. Both the NWAC and LWAC had lower sorptivity and higher resistance to chloride-Ion penetratIon than the cement paste with similar w/c.
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development of lightweight concrete with high resistance to water and chloride Ion penetratIon
Cement & Concrete Composites, 2010Co-Authors: Xuemei Liu, Kok Seng Chia, Min-hong ZhangAbstract:This paper presents an experimental study to evaluate the influence of coarse lightweight aggregate (LWA), fine LWA and the quality of the paste matrix on water absorptIon and permeability, and resistance to chloride-Ion penetratIon in concrete. The results indicate that incorporatIon of pre-soaked coarse LWA in concrete increases water sorptivity and permeability slightly compared to normal weight concrete (NWC) of similar water-to-cementitious materials ratio (w/cm). Furthermore, resistance of the sand-lightweight concrete (LWC) to water permeability and chloride-Ion penetratIon decreases with an increase in porosity of the coarse LWA. The use of fine LWA including a crushed fractIon <1.18 mm reduced resistance of the all-LWC to water and chloride-Ion penetratIon compared with the sand-LWC which has the same coarse LWA. Overall, the quality of the paste matrix was dominant in controlling the transport properties of the concrete, regardless of porosity of the aggregates used. With low w/cm and silica fume, low unit weight LWC (1300 kg/m3) was produced with a higher resistance to water and chloride-Ion penetratIon compared with NWC and LWC of higher unit weights. (A) Reprinted with permissIon from Elsevier.
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Development of lightweight concrete with high resistance to water and chloride-Ion penetratIon
Cement and Concrete Composites, 2010Co-Authors: Xuemei Liu, Kok Seng Chia, Min-hong ZhangAbstract:This paper presents an experimental study to evaluate the influence of coarse lightweight aggregate (LWA), fine LWA and the quality of the paste matrix on water absorptIon and permeability, and resistance to chloride-Ion penetratIon in concrete. The results indicate that incorporatIon of pre-soaked coarse LWA in concrete increases water sorptivity and permeability slightly compared to normal weight concrete (NWC) of similar water-to-cementitious materials ratio (w/cm). Furthermore, resistance of the sand-lightweight concrete (LWC) to water permeability and chloride-Ion penetratIon decreases with an increase in porosity of the coarse LWA. The use of fine LWA including a crushed fractIon
Jun Zhao - One of the best experts on this subject based on the ideXlab platform.
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influences of freeze thaw cycle and curing time on chloride Ion penetratIon resistance of sulphoaluminate cement concrete
Construction and Building Materials, 2014Co-Authors: Jun Zhao, Shunbo ZhaoAbstract:Abstract In this paper, the influences of freeze–thaw cycle and curing time on the chloride Ion penetratIon resistance of Portland and Sulphoaluminate cement concretes were researched. Results show that freeze–thaw cycle and curing time have significant influences on chloride Ion penetratIon resistance of the two cement concretes. Although the chloride diffusIon coefficients of the two cement concretes decrease gradually when curing time increases, it is much lower for Sulphoaluminate cement concrete. The chloride diffusIon coefficient and chloride Ion penetratIon depth both increase obviously after the two cement concretes were subjected to the freeze–thaw cycles, which indicates that the freeze–thaw cycles can accelerate the chloride Ion diffusIon into the two concretes. Under the same freeze–thaw cycle and curing time, Sulphoaluminate cement concrete has much better chloride Ion penetratIon resistance than Portland cement concrete. Comparing with Portland cement concrete, the variatIon rates of chloride diffusIon coefficient and chloride Ion penetratIon depth both increase more rapidly for Sulphoaluminate cement concrete after freeze–thaw cycle.
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Influences of freeze–thaw cycle and curing time on chloride Ion penetratIon resistance of Sulphoaluminate cement concrete
Construction and Building Materials, 2014Co-Authors: Jun Zhao, Gaochuang Cai, Danying Gao, Shunbo ZhaoAbstract:Abstract In this paper, the influences of freeze–thaw cycle and curing time on the chloride Ion penetratIon resistance of Portland and Sulphoaluminate cement concretes were researched. Results show that freeze–thaw cycle and curing time have significant influences on chloride Ion penetratIon resistance of the two cement concretes. Although the chloride diffusIon coefficients of the two cement concretes decrease gradually when curing time increases, it is much lower for Sulphoaluminate cement concrete. The chloride diffusIon coefficient and chloride Ion penetratIon depth both increase obviously after the two cement concretes were subjected to the freeze–thaw cycles, which indicates that the freeze–thaw cycles can accelerate the chloride Ion diffusIon into the two concretes. Under the same freeze–thaw cycle and curing time, Sulphoaluminate cement concrete has much better chloride Ion penetratIon resistance than Portland cement concrete. Comparing with Portland cement concrete, the variatIon rates of chloride diffusIon coefficient and chloride Ion penetratIon depth both increase more rapidly for Sulphoaluminate cement concrete after freeze–thaw cycle.
Xuemei Liu - One of the best experts on this subject based on the ideXlab platform.
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Water and chloride Ion penetratIon resistance of highstrength ultra lightweight cement composite
2012Co-Authors: Xuemei Liu, Min-hong Zhang, Kok Seng Chia, Jat Yuen LiewAbstract:Durability is a significant issue to focus on for newly developed structural lightweight cement composite (ULCC). This paper presents an experimental study to evaluate the resistance of ULCC to water and chloride Ion penetratIon. Chloride penetrability and sorptivity were evaluated for ULCC (unit weight about 1450 kg/m3) and compared with those of a normal weight concrete (NWC), a lightweight aggregate concrete (LWC), and an ultra lightweight composite with proprietary cementitious binder (DB) (unit weight about 1450 kg/m3) at similar compressive strength of about 60 MPa. Rapid chloride penetrability test, rapid migratIon test, water absorptIon (sorptivity) test, and water permeability test were conducted on these mixtures. Results indicate that ULCC and DB had comparable performance. Compared with control LWC and NWC at similar strength level, the ULCC and DB mixtures had higher resistance to chloride Ion penetratIon, lower water absorptIon and virtually impermeable to water penetratIon.
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Water and chloride Ion penetratIon resistance of high-strength ultra lightweight cement composite
2012Co-Authors: Xuemei Liu, Min-hong Zhang, Kok Seng Chia, Richard J.y. LiewAbstract:Durability is a significant issue to focus on for newly developed structural lightweight cement composite (ULCC). This paper presents an experimental study to evaluate the resistance of ULCC to water and chloride Ion penetratIon. Chloride penetrability and sorptivity were evaluated for ULCC (unit weight about 1450 kg/m3) and compared with those of a normal weight concrete (NWC), a lightweight aggregate concrete (LWC), and an ultra lightweight composite with proprietary cementitious binder (DB) (unit weight about 1450 kg/m3) at similar compressive strength of about 60 MPa. Rapid chloride penetrability test, rapid migratIon test, water absorptIon (sorptivity) test, and water permeability test were conducted on these mixtures. Results indicate that ULCC and DB had comparable performance. Compared with control LWC and NWC at similar strength level, the ULCC and DB mixtures had higher resistance to chloride Ion penetratIon, lower water absorptIon and virtually impermeable to water penetratIon.
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development of lightweight concrete with high resistance to water and chloride Ion penetratIon
Cement & Concrete Composites, 2010Co-Authors: Xuemei Liu, Kok Seng Chia, Min-hong ZhangAbstract:This paper presents an experimental study to evaluate the influence of coarse lightweight aggregate (LWA), fine LWA and the quality of the paste matrix on water absorptIon and permeability, and resistance to chloride-Ion penetratIon in concrete. The results indicate that incorporatIon of pre-soaked coarse LWA in concrete increases water sorptivity and permeability slightly compared to normal weight concrete (NWC) of similar water-to-cementitious materials ratio (w/cm). Furthermore, resistance of the sand-lightweight concrete (LWC) to water permeability and chloride-Ion penetratIon decreases with an increase in porosity of the coarse LWA. The use of fine LWA including a crushed fractIon <1.18 mm reduced resistance of the all-LWC to water and chloride-Ion penetratIon compared with the sand-LWC which has the same coarse LWA. Overall, the quality of the paste matrix was dominant in controlling the transport properties of the concrete, regardless of porosity of the aggregates used. With low w/cm and silica fume, low unit weight LWC (1300 kg/m3) was produced with a higher resistance to water and chloride-Ion penetratIon compared with NWC and LWC of higher unit weights. (A) Reprinted with permissIon from Elsevier.
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Development of lightweight aggregate concrete with high resistance to water and chloride-Ion penetratIon
Science & Engineering Faculty, 2010Co-Authors: Xuemei Liu, Kong Seng Chia, Min-hong ZhangAbstract:This paper presents an experimental study to evaluate the effect of coarse and fine LWA in concrete on its water absorptIon and permeability, and resistance to chloride-Ion penetratIon. In additIons, LWC with lower unit weight of about 1300 kg/m3 but high resistance to water and chloride-Ion penetratIon was developed and evaluated. The results indicate that the incorporatIon of coarse LWA in concrete increases water sorptivity and permeability slightly compared to NWC of similar w/c. The resistance of the sand-LWC to chloride-Ion penetratIon depends on porosity of the coarse LWA. Fine LWA has more influence on the transport proper-ties of concrete than coarse LWA. Use of lightweight crushed sand
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Development of lightweight concrete with high resistance to water and chloride-Ion penetratIon
Cement and Concrete Composites, 2010Co-Authors: Xuemei Liu, Kok Seng Chia, Min-hong ZhangAbstract:This paper presents an experimental study to evaluate the influence of coarse lightweight aggregate (LWA), fine LWA and the quality of the paste matrix on water absorptIon and permeability, and resistance to chloride-Ion penetratIon in concrete. The results indicate that incorporatIon of pre-soaked coarse LWA in concrete increases water sorptivity and permeability slightly compared to normal weight concrete (NWC) of similar water-to-cementitious materials ratio (w/cm). Furthermore, resistance of the sand-lightweight concrete (LWC) to water permeability and chloride-Ion penetratIon decreases with an increase in porosity of the coarse LWA. The use of fine LWA including a crushed fractIon
