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为合理地选择水灰比、胶凝材料掺量、骨料用量等配合比参数,从而达到降低混凝土干缩的目的,采用设计的干燥收缩试验装置,通过改变参数水平,研究了不同因素对道路混凝土早期干缩的影响,并确定了控制干缩的主要配合比参数。通过对比分析现有干缩预测模型的局限性,基于多元线性回归理论,利用SPSS软件建立了基于原材料组成的道路混凝土早期干缩预测模型。研究结果表明:在选定的原料试验范围内,用水量和骨料体积含量是影响道路混凝土干缩率的主要因素,水泥用量次之,粗细集料体积比基本上没有影响;可为道路混凝土抗裂性配合比设计提供理论基础。
In order to reduce the shrinkage of concrete, the designed drying shrinkage test equipment was adopted to change the parameters to study the effect of different factors on the road The influence of concrete early shrinkage and the main parameters for controlling shrinkage were determined. By comparing and analyzing the limitations of the existing shrinkage prediction model, an early dry shrinkage prediction model of road concrete based on raw material composition was established by using SPSS software based on multiple linear regression theory. The results show that water consumption and aggregate volume content are the main factors influencing the shrinkage of road concrete in the range of selected raw materials tested, followed by the amount of cement, the volume ratio of coarse and fine aggregate has basically no effect; for road concrete Crack resistance design to provide the theoretical basis.