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探究了混凝土的自收缩与抗压强度的相关性,建立了描述两者关系的二次多项式数学模型。该模型是基于抗压强度和自收缩均与混凝土的孔隙及其特征密切关联的事实提出的。通过对文献中报道的实验数据进行回归分析求解了这一相关性模型的非变量参数。发现拟合曲线与实验数据的吻合度较高,其回归系数普遍高于0.94。基于现有数据,对可能影响该模型适用性的因素如水胶比、矿物掺合料、化学外加剂及环境温度等进行了分析。分析表明,对于骨料总用量为1 500~1 841 kg/m3、砂率为36.8%~45.3%的混凝土,所提出的自收缩与抗压强度相关性模型具有较好的适用性。
The correlation between self-shrinkage and compressive strength of concrete is explored, and a quadratic polynomial mathematical model describing the relationship between the two is established. The model is based on the fact that both compressive strength and self-shrinkage are closely related to the porosity of concrete and its characteristics. Through regression analysis of experimental data reported in the literature, the non-variable parameters of this correlation model were solved. It is found that the fitted curve has good agreement with the experimental data, and the regression coefficient is generally higher than 0.94. Based on available data, factors that may affect the applicability of the model, such as water-binder ratio, mineral admixtures, chemical admixtures and ambient temperature, were analyzed. The analysis shows that the proposed self-shrinking and compressive strength correlation model has good applicability to the concrete with the total aggregate amount of 1 500 ~ 1 841 kg / m3 and the sand rate of 36.8% ~ 45.3%.