Influence of Mineral Admixtures and Air-Entraining Agent on Thermal Expansion Property of Cement-Based Materials
Influence of Mineral Admixtures and Air-Entraining Agent on Thermal Expansion Property of Cement-Based Materials
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发表时间：
2009
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影响因子：
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通讯作者：
Q. Chun-xiang;Zhuang Chen-feng
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作者：
Q. Chun-xiang;Zhuang Chen-feng
矿物掺合料和引气剂是高性能混凝土的重要组成部分，研究了粉煤灰、矿渣微粉和引气剂对水泥基材料热膨胀性能的影响，结果表明：在相同掺量下，矿渣微粉砂浆的热膨胀系数远高于粉煤灰砂浆;随着粉煤灰掺量的增加，砂浆和混凝土的热膨胀系数都相应降低。当粉煤灰掺量小于20%时，混凝土的单位抗压强度CTE随粉煤灰掺量的增加而降低;当粉煤灰掺量大于20%时，混凝土的抗压强度下降幅度过大;随着含气量的增加，混凝土的CTE降低，但混凝土的强度降低。
Mineral admixtures and air-entraining agent are the important component of high-performance concrete.The influence of fly ash,slag powder and airentraining agent on the thermal expansion property of cement-based materials was studied.The results fall into several aspects.Firstly,with the same mix amount,the coefficient of thermal expansion(CTE) of mortar containing slag powder is much higher than that of mortar containing fly ash.Secondly,with the increase of fly ash content,the CTE of both mortar and concrete decreases accordingly. When the fly ash content is less than 20%,the CTE per unit compressive strength decreases with increasing fly ash content.When the fly ash content is over 20%,the compressive strength of concrete will decrease too much.Lastly,the CTE of concrete decreases with the increase of air content,but the strength of concrete is reduced.