煅烧高岭土粉对低碳混凝土性能影响的研究

Study on the effects of calcined-kaolin powder on low-carbon concrete

为降低混凝土成本,提高其性能,将煅烧高岭土粉按一定比例替代矿粉配制低碳混凝土,对煅烧高岭土粉的特性及其对低碳混凝土力学性能、收缩性能和抗冻融性能的影响进行了研究.结果表明:煅烧高岭土粉具有填充效应和高水化活性.当其替代矿粉的质量分数为20%时,低碳混凝土的抗压强度与基准混凝土相近,28d收缩率比减少了5%;经过200次冻融循环后,其质量和抗压强度的损失率均比基准混凝土分别减少了0.17%和2.07%.

The calcined kaolin powder was replaced by mineral powder in a certain proportion to prepare low carbon concrete.The characteristics of calcined-kaolin powder and the effects on the mechanical properties,shrinkage and freeze-thaw resistance of low-carbon concrete were studied.The results show that the calcined kaolin powder has a filling effect and a high hydration activity.When the mass fraction of the substitute mineral powder is 20%,the compressive strength of the low carbon concrete is similar to that of the reference concrete,and the 28d shrinkage ratio is reduced by 5%;after 200 freeze-thaw cycles,the mass and compressive strength are lost.The rates were reduced by 0.17%and 2.07% compared to the baseline concrete,respectively.