基于迭代算法的水泥水化动力学多元方法研究

发布时间：2018-05-05 06:03

本文选题：水化动力学 + 水化方程参数　；参考：《合肥工业大学学报(自然科学版)》2017年03期

【摘要】：为合理确定水化动力学分析的参数和实现研究手段多样化,文章提出一种参数识别迭代算法,并探讨了获取水化热数据的数值试验和替代水化热法的背散射电子(back-scattered electron,BSE)图像识别。针对Krstulovic水化动力学模型,通过迭代算法得出各水化阶段的控制时间,为参数识别提供有效的数据区间;使用COMSOL软件建立与绝热温升试验工况一致的数值仿真试验,并将获得的水化温度曲线和最大水化放热量与试验数据进行了比较;识别不同水化时期水泥浆体BSE图像中水化产物的面积比,作为水化程度来确定水泥水化指数函数方程,并与试验数据对比来评价该方程的预估精度。依据迭代算法获取了合理的水化动力学参数,其生成的水化速率曲线与试验数据具有较好的吻合度;水泥水化数值仿真试验可以用来预测绝热情况下水泥混凝土的温度变化,能替代绝热温升试验;依据BSE图像中水化产物面积比获得的水化指数函数与试验数据的吻合度较好,能替代传统水化热法进行水化动力学分析。
[Abstract]:In order to reasonably determine the parameters of hydration dynamics analysis and to realize the diversification of research methods, an iterative algorithm for parameter identification is proposed, and the numerical experiments for obtaining hydration heat data and the back-scattered electron scattering BSEimage recognition instead of hydration heat method are discussed. According to the Krstulovic hydration dynamics model, the control time of each hydration stage is obtained by iterative algorithm, which provides an effective data interval for parameter identification, and the numerical simulation experiment is established by using COMSOL software, which is consistent with the adiabatic temperature rise test condition. The obtained hydration temperature curve and maximum hydration heat release are compared with the experimental data, the area ratio of hydration products in BSE images of cement paste at different hydration periods is identified, and the hydration index function equation is determined as the hydration degree. The prediction accuracy of the equation is evaluated by comparing with the experimental data. Reasonable hydration kinetic parameters are obtained by iterative method, and the hydration rate curve is in good agreement with the experimental data, and the numerical simulation test of cement hydration can be used to predict the temperature change of cement concrete under adiabatic condition. It can replace the adiabatic temperature rise test, and the hydration index function obtained by the area ratio of the hydration product in BSE image is in good agreement with the experimental data, so it can be used to analyze the hydration kinetics instead of the traditional hydration heat method.
【作者单位】：合肥工业大学汽车与交通工程学院;中铁城市规划院有限公司;
【基金】：国家自然科学基金资助项目(51008109;51408173) 安徽省住房城乡建设科学技术计划资助项目(2013YF-01)
【分类号】：TQ172.11

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