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为提高混凝土防冻剂的使用效率,增强混凝土在负温条件下的性能,研究防冻混凝土的最优配比.通过研究混凝土防冻剂防冻组分对混凝土性能影响,采用三因素三水平的响应曲面分析法,在考虑硝酸钙、减水剂和引气剂对混凝土强度、坍落度和含气体积分数的影响情况下,在单因素试验的基础上,建立二次多项数学模型.最后确定了防冻混凝土最优配比:硝酸钙掺量为4.79%,减水剂掺量为0.21%,引气剂掺量为0.31%.研究结果表明,响应曲面法可以对防冻混凝土配比设计进行优化.
In order to improve the efficiency of concrete antifreeze and enhance the performance of concrete under negative temperature conditions, the optimal proportion of antifreezing concrete was studied.Through the study of concrete antifreeze antifreeze components on the performance of concrete, the use of three factors and three levels of response surface analysis Method, taking into account the influence of calcium nitrate, water-reducing agent and air-entraining agent on concrete strength, slump and gas-containing volume fraction, based on the single factor test, the mathematical model of quadratic multiple is established. Finally, The optimal ratio of antifreeze concrete is 4.79% for calcium nitrate, 0.21% for water reducer and 0.31% for air-entraining agent.The results show that response surface methodology can optimize the design of antifreezing concrete mix.