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Cement hydration based model to predict the mechanical properties of precast concrete

机译：基于水泥水化的模型来预测预制混凝土的力学性能

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摘要

An adiabatic temperature rise (ATR) test was used to determine the degree of cement hydration in concrete. In the experiments, emphasis was placed on the influences of water to cementitious material ratio (w/b) and aggregate content on the ATR and the development of degree of cement hydration. A total of nine concrete mixtures with three w/b ratios (0.30, 0.43, 0.62) and three aggregate contents (50%, 60%, 70% by volume) were used in the tests. The experimental results show that, for a given aggregate content, the lower the w/b ratio, the higher the temperature rise. For a given w/b ratio, the higher the aggregate content, the lower the temperature rise. The effects of temperature and age on the hydration process of cement may be taken into consideration by the equivalent age concept. For the same equivalent age, the degree of cement hydration is a function of w/b ratio only, regardless of the aggregate content. The advance of degree of cement hydration with equivalent age can be described as an initially slow developing stage, followed by a fast increasing stage and then a nearly steady-state stage. With an increase in w/b ratio, both the length of the initial stage and the ultimate degree of cement hydration at steady state increase. The higher the w/b, the longer the equivalent age needed to achieve the steady state. In addition, a model for predicting concrete elastic modulus and compressive strength, based on the degree of cement hydration in which the effect of environmental drying can be taken into account, was developed; good agreement was found between the test and model results. The model may be used for the prediction of mechanical properties of precast concrete under different curing conditions.
机译：绝热温升（ATR）测试用于确定混凝土中水泥的水合程度。在实验中，重点放在水与胶凝材料之比（w / b）和骨料含量对ATR和水泥水化程度发展的影响上。试验中总共使用了九种混凝土混合物，三种混合比（0.30、0.43、0.62）和三种骨料含量（50％，60％，70％（体积））。实验结果表明，对于给定的骨料含量，w / b比越低，温升越高。对于给定的w / b比，骨料含量越高，温升越低。等效年龄概念可以考虑温度和年龄对水泥水化过程的影响。对于相同的等效年龄，水泥的水合度仅是w / b比的函数，而与骨料含量无关。水泥水化程度随同龄期的提高可以描述为最初的缓慢发展阶段，然后是快速增加阶段，然后接近稳态阶段。随着w / b比的增加，稳态时水泥浆初始阶段的长度和极限水化程度都增加。 w / b越高，达到稳态所需的等效寿命越长。另外，基于水泥水化程度，考虑环境干燥的影响，建立了预测混凝土弹性模量和抗压强度的模型。在测试和模型结果之间找到了很好的一致性。该模型可用于预测不同养护条件下预制混凝土的机械性能。

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  • 来源
    《Magazine of Concrete Research》 |2014年第12期|603-617|共15页
  • 作者

    Jun Zhang; Yudong Han; Jianguo Han; Zhenbo Wang;

  • 作者单位

    Key Laboratory of Safety and Durability of Civil Engineering, Department of Civil Engineering, Tsinghua University, Beijing, China;

    Key Laboratory of Safety and Durability of Civil Engineering, Department of Civil Engineering, Tsinghua University, Beijing, China;

    Key Laboratory of Safety and Durability of Civil Engineering, Department of Civil Engineering, Tsinghua University, Beijing, China;

    Key Laboratory of Safety and Durability of Civil Engineering, Department of Civil Engineering, Tsinghua University, Beijing, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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