高寒高海拔地区外加剂对混凝土力学性能的影响

在混凝土施工中，外加剂应用广泛，其中减水剂、引气剂和速凝剂对混凝土力学性能影响显著。本文研究了掺量为0、0.5%、1%、2%的减水剂，掺量为0、0.25%、0.5%、1%的引气剂，掺量为0、6%、8%、10%的速凝剂对混凝土力学性能的影响。结果表明，适宜的减水剂可提高混凝土的强度，引气剂的掺加会降低混凝土的强度，速凝剂可提高混凝土的早期强度，但后期强度增长缓慢甚至会倒缩。

Effects of admixtures on mechanical properties of concrete in high cold and high altitude areas

Admixtures are widely used in concrete construction, among which water reducing agent, air-entraining agent and accelerator have significant effects on the mechanical properties of concrete. In this paper, the effect of the water reducing agent with the dosage of 0, 0.5%, 1% and 2%, the air-entraining agent with the dosage of 0, 0.25%, 0.5% and 1%, and the accelerator with the dosage of 0, 6%, 8% and 10%, on the mechanical properties of concrete are studied respectively. The results show that the appropriate water reducing agent can improve the strength of concrete, the addition of air-entraining agent can reduce the strength of concrete, and the accelerator can improve the early strength of concrete, but the later strength increases slowly and even shrinks.