| 引用本文: | 陈长久,安雪晖.水泥粒径分布对混凝土绝热温升影响的模拟[J].哈尔滨工业大学学报,2012,44(6):126.DOI:10.11918/j.issn.0367-6234.2012.06.028 |
| CHEN Chang-jiu,AN Xue-hui.Simulation of the effects of cement particle size on adiabatic temperature rise of concrete[J].Journal of Harbin Institute of Technology,2012,44(6):126.DOI:10.11918/j.issn.0367-6234.2012.06.028 |
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| 摘要: |
| 为了模拟水泥粒径分布对混凝土绝热温升过程的影响,建立了一个基于水化深度的水化模型．该模型假定混凝土中水泥水化过程由水化深度控制,且水化深度随时间的发展与颗粒粒径无关;通过水泥等温放热曲线试验推导得出最大水化深度的存在;假定温度对水化过程的影响满足Arrhenius公式．通过混凝土绝热温升仪测定了3种不同初始温度下的绝热温升曲线,以此得到水化模型所需的基准水化速率曲线．最后将建立的水化模型用于模拟混凝土的绝热温升曲线,结果表明:基于水化深度的水化模型能够准确模拟水泥粒径分布和初始温度对混凝土绝热温升的影响． |
| 关键词: 混凝土绝热温升 数值模拟 水泥粒径分布 Arrhenius公式 最大水化深度 |
| DOI：10.11918/j.issn.0367-6234.2012.06.028 |
| 分类号:TU52801 |
| 基金项目: |
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| Simulation of the effects of cement particle size on adiabatic temperature rise of concrete |
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CHEN Chang-jiu, AN Xue-hui
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State Key Laboratory of Hydroscience and Engineering, Tsinghua University, 100084 Beijing, China
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| Abstract: |
| To simulate the effects of cement's particle size distribution on the adiabatic temperature rise of concrete, a hydration model based on hydration depth was built. In this model, the hydration process of cement in concrete was assumed to be controlled by the hydration depth, which was independent of cement particle size; Based on the experimental results of isothermal hydration heat of cement, the maximum hydration depth was deduced; The effects of temperature on the hydration process was assumed to be simulated by the Arrhenius law. The reference hydration rate curve was derived from the adiabatic temperature rises of concrete at three different casting temperatures, which were examined by the adiabatic temperature rise equipment. At last, the model was applied to simulate the adiabatic temperature rise of concrete in the experiments. The results show that the hydration model based on the hydration depth can simulate the effects of cement's particle size distribution and casting temperature on the adiabatic temperature rise of concrete with satisfactory accuracy. |
| Key words: adiabatic temperature rise of concrete numerical simulation cement particle size distribution Arrhenius law maximum hydration depth |
