The Experts below are selected from a list of 507 Experts worldwide ranked by ideXlab platform
Zhou Zhikai - One of the best experts on this subject based on the ideXlab platform.
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comparison of the properties between high volume fly ash concrete and high volume steel slag concrete under temperature matching Curing Condition
Construction and Building Materials, 2015Co-Authors: Shi Mengxiao, Wang Qiang, Zhou ZhikaiAbstract:Abstract Massive concrete structures tend to have high cracking risk due to early temperature rise. High-volume mineral admixture concrete, which has low hydration heat, is suitable for massive concrete structures. In this paper, the properties of high-volume fly ash (HVFA) concrete and high-volume steel slag (HVSS) concrete were compared under two different Curing Conditions (Standard Curing Condition and temperature match Curing Condition). The results show that the promoting effect of temperature match Curing on the early strength of HVFA concrete is more obvious than that on HVSS concrete. Temperature match Curing has negative effect on the late strength and elastic modulus of HVSS concrete. The promotion of temperature match Curing to the elastic modulus development is not so obvious as that to the strength development. Temperature match Curing can significantly decrease the chloride permeability of HVFA concrete, but its influence on the chloride permeability of HVSS concrete is inconspicuous. Though the adiabatic temperature rise of HVSS concrete is lower than that of HVFA concrete, which is beneficial to its application to the massive concrete structures, its strength especially the splitting tensile strength and resistance to chloride ion penetration need to be improved.
Yongqiang Wei - One of the best experts on this subject based on the ideXlab platform.
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Effect of steel slag on fresh, hardened and microstructural properties of high-calcium fly ash based geopolymers at Standard Curing Condition
Construction and Building Materials, 2019Co-Authors: Weilong Song, Zhiduo Zhu, Yuyi Peng, Yu Wan, Song Shigong, Yongqiang WeiAbstract:Abstract This study presents an extensive experimental investigation on the effect of steel slag (SS) usage on the fresh, hardened and microstructural properties of high-calcium fly ash (FA) based geopolymer pastes at Standard Curing Condition. SS was used to partially replace FA to form a binary composite raw material system and six experimental groups were designed according to the replacement levels of 0, 10%, 20%, 30%, 40% and 50% (by mass). The fresh properties including setting times, flowability and viscosity, as well as the hardened properties including compressive strength, flexural strength, elasticity modulus and sorptivity of the geopolymer pastes with different SS contents were investigated. In addition, the microstructural properties of 28-day geopolymer pastes were studied by various microscale analysis methods. The results indicated that the incorporation of SS obviously increased the setting times and flowability of fresh geopolymer pastes. SS can replace up to 20% FA without 28-day compressive strength loss. A strong correlation between sorptivity and compressive strength of hardened geopolymer pastes was observed. The strength of hardened geopolymer paste was related to its porosity and capillary pore volume, and the sorptivity was related to the critical and threshold pore diameters of geopolymer matrix.
Shi Mengxiao - One of the best experts on this subject based on the ideXlab platform.
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comparison of the properties between high volume fly ash concrete and high volume steel slag concrete under temperature matching Curing Condition
Construction and Building Materials, 2015Co-Authors: Shi Mengxiao, Wang Qiang, Zhou ZhikaiAbstract:Abstract Massive concrete structures tend to have high cracking risk due to early temperature rise. High-volume mineral admixture concrete, which has low hydration heat, is suitable for massive concrete structures. In this paper, the properties of high-volume fly ash (HVFA) concrete and high-volume steel slag (HVSS) concrete were compared under two different Curing Conditions (Standard Curing Condition and temperature match Curing Condition). The results show that the promoting effect of temperature match Curing on the early strength of HVFA concrete is more obvious than that on HVSS concrete. Temperature match Curing has negative effect on the late strength and elastic modulus of HVSS concrete. The promotion of temperature match Curing to the elastic modulus development is not so obvious as that to the strength development. Temperature match Curing can significantly decrease the chloride permeability of HVFA concrete, but its influence on the chloride permeability of HVSS concrete is inconspicuous. Though the adiabatic temperature rise of HVSS concrete is lower than that of HVFA concrete, which is beneficial to its application to the massive concrete structures, its strength especially the splitting tensile strength and resistance to chloride ion penetration need to be improved.
Weilong Song - One of the best experts on this subject based on the ideXlab platform.
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Effect of steel slag on fresh, hardened and microstructural properties of high-calcium fly ash based geopolymers at Standard Curing Condition
Construction and Building Materials, 2019Co-Authors: Weilong Song, Zhiduo Zhu, Yuyi Peng, Yu Wan, Song Shigong, Yongqiang WeiAbstract:Abstract This study presents an extensive experimental investigation on the effect of steel slag (SS) usage on the fresh, hardened and microstructural properties of high-calcium fly ash (FA) based geopolymer pastes at Standard Curing Condition. SS was used to partially replace FA to form a binary composite raw material system and six experimental groups were designed according to the replacement levels of 0, 10%, 20%, 30%, 40% and 50% (by mass). The fresh properties including setting times, flowability and viscosity, as well as the hardened properties including compressive strength, flexural strength, elasticity modulus and sorptivity of the geopolymer pastes with different SS contents were investigated. In addition, the microstructural properties of 28-day geopolymer pastes were studied by various microscale analysis methods. The results indicated that the incorporation of SS obviously increased the setting times and flowability of fresh geopolymer pastes. SS can replace up to 20% FA without 28-day compressive strength loss. A strong correlation between sorptivity and compressive strength of hardened geopolymer pastes was observed. The strength of hardened geopolymer paste was related to its porosity and capillary pore volume, and the sorptivity was related to the critical and threshold pore diameters of geopolymer matrix.
Wang Qiang - One of the best experts on this subject based on the ideXlab platform.
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comparison of the properties between high volume fly ash concrete and high volume steel slag concrete under temperature matching Curing Condition
Construction and Building Materials, 2015Co-Authors: Shi Mengxiao, Wang Qiang, Zhou ZhikaiAbstract:Abstract Massive concrete structures tend to have high cracking risk due to early temperature rise. High-volume mineral admixture concrete, which has low hydration heat, is suitable for massive concrete structures. In this paper, the properties of high-volume fly ash (HVFA) concrete and high-volume steel slag (HVSS) concrete were compared under two different Curing Conditions (Standard Curing Condition and temperature match Curing Condition). The results show that the promoting effect of temperature match Curing on the early strength of HVFA concrete is more obvious than that on HVSS concrete. Temperature match Curing has negative effect on the late strength and elastic modulus of HVSS concrete. The promotion of temperature match Curing to the elastic modulus development is not so obvious as that to the strength development. Temperature match Curing can significantly decrease the chloride permeability of HVFA concrete, but its influence on the chloride permeability of HVSS concrete is inconspicuous. Though the adiabatic temperature rise of HVSS concrete is lower than that of HVFA concrete, which is beneficial to its application to the massive concrete structures, its strength especially the splitting tensile strength and resistance to chloride ion penetration need to be improved.