基于骨料-浆体两相组成的混凝土细观结构定量研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (6): 2011-2018.

基于骨料-浆体两相组成的混凝土细观结构定量研究

许海铭¹, 许晓明², 牛贺洋³, 许鸽龙⁴, 蔡基伟⁴, 田青⁴

1.开封城市运营投资集团有限公司,开封 475004;
2.长沙县自然资源局,长沙 410100;
3.黄河水利职业技术学院,开封 475004;
4.河南大学,开封市工程修复与材料循环工程技术研究中心,开封 475004

收稿日期:2020-11-25 修回日期:2021-01-21 出版日期:2021-06-15 发布日期:2021-07-08
通讯作者: 许鸽龙,博士。E-mail:henu2020@yeah.net
作者简介:许海铭(1989—),男,硕士研究生。主要从事市政工程方面的研究。E-mail:xhmhenu@163.com
基金资助:
河南省科技发展计划(152102210053)

Quantitative Study of Concrete Mesostructure Based on Two-Phase Composition of Aggregate and Paste

XU Haiming¹, XU Xiaoming², NIU Heyang³, XU Gelong⁴, CAI Jiwei⁴, TIAN Qing⁴

1. Kaifeng Urban Operation and Investment Group Co., Ltd., Kaifeng 475004, China;
2. Changsha County Bureau of Natural Resources,Changsha 410100, China;
3. Yellow River Conservancy Technical Institute, Kaifeng 475004, China;
4. Kaifeng Research Center forEngineering Repair and Material Recycle, Henan University, Kaifeng 475004, China

Received:2020-11-25 Revised:2021-01-21 Online:2021-06-15 Published:2021-07-08

摘要/Abstract

摘要： 骨料间浆体层厚度或距离是混凝土性能研究和配合比设计中的重要参数,其定量方法一般包括两类浆体层厚度的计算模型、平均自由程模型以及图像分析法。本文使用以上方法计算、测量了24组混凝土试样的浆体层厚度和骨料间自由程,通过对比试样结果间的差异与关系,来说明不同方法的适用性。结果表明:不同方法所得浆体层厚度与骨料体积分数之间呈幂函数关系,且不同方法的计算值或测量值之间具有较好的线性关系,说明它们均可用于定性分析混凝土性能与细观结构之间的关系;通过对比不同浆体层厚度定量模型的推导过程,得到了修正的浆体层厚度(MAPT_Ⅱ)模型,相比最大/平均浆体层厚度(MPT/APT_Ⅰ)模型,其具有更好的便利性和精确程度。

关键词: 混凝土细观结构, 骨料分布, 定量方法, 浆体层厚度, 骨料间自由程

Abstract: Paste thickness or distance between aggregates is an important parameter in the study of concrete properties and the mix design of concrete, and its quantitative methods generally include two types of paste thickness models, the mean free path model and the image processing method. In this paper, the paste thickness and the mean free path of 24 concrete specimens were calculated and measured by the quantitative methods above, by comparing the differences and relationships of the quantitative results, the applicability of these methods was illustrated. The results show that the power functions can be regressed between the paste thickness obtained by different methods and the volume fraction of aggregate, and the linear relationships are observed between the paste thickness calculated and measured by different methods, which implies that all of these methods can be used to qualitatively analyze the relationship between concrete performance and mesostructure. By comparing the derivation process of the different quantitative models, a modified paste thickness model (MAPT_Ⅱ) is obtained, which has better convenience and precision than the maximum/average paste thickness (MPT/APT_Ⅰ) models.

Key words: concrete mesostructure, distribution of aggregate, quantitative method, paste thickness, free path between aggregates

中图分类号:

TU528

许海铭, 许晓明, 牛贺洋, 许鸽龙, 蔡基伟, 田青. 基于骨料-浆体两相组成的混凝土细观结构定量研究[J]. 硅酸盐通报, 2021, 40(6): 2011-2018.

XU Haiming, XU Xiaoming, NIU Heyang, XU Gelong, CAI Jiwei, TIAN Qing. Quantitative Study of Concrete Mesostructure Based on Two-Phase Composition of Aggregate and Paste[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(6): 2011-2018.

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