Characteristic and control method of early-age temperature field for cement concrete pavement
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摘要: 提出了基于水泥混凝土路面温度应力、固化基础温度、固化温度差和养生温度的早龄期温度场控制原则, 采用专用水泥混凝土路面早龄期温度场数值模拟程序, 进行了路面早龄期温度场参数的敏感性和影响特性分析, 评估了路面早龄期温度场控制措施的有效性。分析结果表明: 与材料参数相比, 环境施工参数是影响路面早龄期温度特征的主要因素; 选择合适的铺筑时刻、环境条件可使板顶板底温度差改变达20℃; 采用恰当的养护方式和养护材料可降低路面板温度12℃以上; 混凝土摊铺温度、水灰比和水泥用量对固化基础温度影响显著; 对于特定温度控制指标, 各影响参数敏感性并不相同, 需结合现场路面板早龄期温度仿真平衡措施影响。Abstract: The control principles of early-age temperature field were put forward based on the temperature stress, built-in basic temperature, built-in temperature difference and curing temperature of cement concrete pavement.The specialized early-age temperature field numerical simulation program of cement concrete pavement was used, the sensitivities and influencing characteristics of pavement early-age temperature field parameters were researched, and the effectivenesses of pavement early-age temperature field control measures were evaluated.Analysis result shows that compared with material parameters, environment construction parameters are major factors effecting pavement early-age temperature characteristics.Appropriate paving time and environment condition may change the temperature difference between the top and the bottom of slab more than 20℃.Proper curing methods and curing materials may reduce the temperature of pavement more than 12 ℃.Concrete paving temperature, water cement ratio and cement content significantly effect built-in basic temperature.For specific temperature control target, the sensitivities of influencing parameters are not the same, field pavement early-age temperature simulation should be combined to balance the effects of control measures.
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图 1 环境温度对路面板早龄期温度的影响
Figure 1. Effect of ambient temperature on slab early-age temperature
图 2 环境温度对板顶板底温度差的影响
Figure 2. Effect of ambient temperature on slab temperature difference
图 3 太阳辐射对路面板早龄期温度的影响
Figure 3. Effect of solar radiation on slab early-age temperature
图 4 太阳辐射对板顶板底温度差的影响
Figure 4. Effect of solar radiation on slab temperature difference
图 10 蒸发速率对路面板早龄期温度的影响
Figure 10. Effect of water evaporation rate on slab early-age temperature
图 11 不同养护方式下路面板早龄期温度的发展
Figure 11. Developments of slab early-age temperatures under different curing methods
图 12 蒸发速率对板顶板底温度差的影响
Figure 12. Effect of water evaporation rate on slab temperature difference
图 13 混凝土初始温度对路面板早龄期温度的影响
Figure 13. Effect of concrete initial temperature on slab early-age temperature
图 14 混凝土初始温度对板顶板底温度差的影响
Figure 14. Effect of concrete initial temperature on slab temperature difference
图 17 水灰比对路面板早龄期温度的影响
Figure 17. Effect of water cement ratio on slab early-age temperature
图 18 水灰比对板顶板底温度差的影响
Figure 18. Effect of water cement ratio on slab temperature difference
表 4 降低路面板早龄期温度的措施和效果
Table 4. Countermeasures reducing slab early-age temperature and effects
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表 5 降低板顶板底温度差的措施和效果
Table 5. Countermeasures reducing slab temperature difference and effects
下载: 导出CSV
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