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采用复合力学理论,建立混凝土弯拉强度随龄期增长全过程分析模型。与水泥水化动力学相结合,建立了养生温度和湿度条件下水泥混凝土弯拉强度发展的预估模型,通过试验数据回归分析对不同养生条件下弯拉强度预估模型进行了验证,模型预测结果与实测结果基本相符。研究结果表明,相对湿度越低,各龄期混凝土弯拉强度越低,弯拉强度差异随着龄期增长而变大。初始水灰比大于0.39,则水分蒸发损失对强度的影响减小。据此确定了养生工艺参数,结合水泥混凝土水分蒸发率分析对养生浇水次数进行了重新计算,根据自然养生条件下强度增长规律计算了养生时间,进而提出了水泥混凝土路面自然养生工艺优化措施。
Using the theory of composite mechanics, the whole process model of bending strength of concrete with age is established. Combined with the hydration kinetics of cement, the prediction model of the flexural strength of cement concrete under the temperature and humidity regimen was established. The prediction model of flexural strength under different health conditions was verified by the regression analysis of the experimental data, and the prediction model The results are basically in line with the measured results. The results show that the lower the relative humidity, the lower the flexural strength of concrete at various ages, the greater the difference of flexural strength with age. When the initial water-cement ratio is greater than 0.39, the effect of water evaporation loss on strength decreases. Based on this, the parameters of regimen were determined. Based on the analysis of water evaporation rate of cement concrete, the frequency of regimen watering was recalculated, and the time of regimen was calculated according to the law of strength increasing under natural regimen. Then the optimization measures of natural regimen of cement concrete pavement were put forward.