A new type heat storage concrete material used in solar thermal power was fabricated by using aluminates cement to be the gelatinizer, and using high heat capacity materials, such as basalt and bauxite, as aggregate, ...A new type heat storage concrete material used in solar thermal power was fabricated by using aluminates cement to be the gelatinizer, and using high heat capacity materials, such as basalt and bauxite, as aggregate, and adding high heat conductivity graphite and high efficient water reducing agent. The experimental results show the addition of graphite can improve the thermal conductivity of the concrete, the value of thermal conductivity is about 2.34 W/mK which means the obtained concrete storage material has excellent thermal properties, and it is expected to be a good heat storage material used in solar power.展开更多
By means of hydration heat, XRD and SEM, effect of phosphorus and fluorine （P205 and F-） in phosphorous slag on hydration process of tricalcium silicate （C3S） and tricalcium aluminate （C3A） was explored. The res...By means of hydration heat, XRD and SEM, effect of phosphorus and fluorine （P205 and F-） in phosphorous slag on hydration process of tricalcium silicate （C3S） and tricalcium aluminate （C3A） was explored. The results indicated that the early hydration exothermic rate of C3S and C3A was obviously lowered by P205 and F- in phosphorous slag, the second peak occurring time of C3A was delayed by 0.9 h, the exothermal output of C3S was reduced by 25.04% and the time of accelerating stage was postponed by 0.86 h. The early hydration degree of C3S and C3A was also decreased. Due to the influence of P205 and F, more pores and thinner crystals can be observed in the microstructure of hardened paste and the chance of cracks was reduced.展开更多
基金Funded by the National ‘973’ Program (No. 2010CB227105)the Na-tional ‘863’ Program (No.2007AA05Z459)
文摘A new type heat storage concrete material used in solar thermal power was fabricated by using aluminates cement to be the gelatinizer, and using high heat capacity materials, such as basalt and bauxite, as aggregate, and adding high heat conductivity graphite and high efficient water reducing agent. The experimental results show the addition of graphite can improve the thermal conductivity of the concrete, the value of thermal conductivity is about 2.34 W/mK which means the obtained concrete storage material has excellent thermal properties, and it is expected to be a good heat storage material used in solar power.
基金Funded by the National Natural Science Foundation of China (No.50802067)
文摘By means of hydration heat, XRD and SEM, effect of phosphorus and fluorine （P205 and F-） in phosphorous slag on hydration process of tricalcium silicate （C3S） and tricalcium aluminate （C3A） was explored. The results indicated that the early hydration exothermic rate of C3S and C3A was obviously lowered by P205 and F- in phosphorous slag, the second peak occurring time of C3A was delayed by 0.9 h, the exothermal output of C3S was reduced by 25.04% and the time of accelerating stage was postponed by 0.86 h. The early hydration degree of C3S and C3A was also decreased. Due to the influence of P205 and F, more pores and thinner crystals can be observed in the microstructure of hardened paste and the chance of cracks was reduced.
