中高强混凝土抗压强度与气孔分布特征关系模型研究

杨帅; 毛海涛; 刘畅; 王晓菊

doi:10.11988/ckyyb.20221442

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raybet体育在线院报 ›› 2024, Vol. 41 ›› Issue (4) : 194-202. DOI: 10.11988/ckyyb.20221442

水工结构与材料

中高强混凝土抗压强度与气孔分布特征关系模型研究

杨帅^1,2, 毛海涛^1,2, 刘畅², 王晓菊¹

作者信息 +

Modeling the Relationship between Compressive Strength and Pore Distribution Characteristics of Medium-to-High Strength Concrete

YANG Shuai¹, MAO Hai-tao^1,2, LIU Chang², WANG Xiao-ju²

Author information +

文章历史 +

摘要

为探究气孔分布特征与中高强混凝土抗压强度之间的定量关系,采用低场核磁共振成像分析系统与全自动压力试验机开展了不同气孔分布特征下的高强混凝土抗压强度试验。通过对Ryshkewitch半经验公式模型进行验证和改进,建立了中高强混凝土抗压强度与孔结构关系模型。结果表明:混凝土孔隙率会随着砂率和初始含气量的增加而逐渐增加,相比于提高砂率,提高初始含气量更容易得到差异性较大的孔隙率;提高砂率使非毛细孔占比增加了17.2%,毛细孔占比降低了13.0%;提高初始含气量使毛细孔占比增加了12.7%,凝胶孔占比降低了12.6%。基于Ryshkewitch半经验公式改进的模型R²接近于1,P值<0.05,可以更准确地描述孔隙分布特征与抗压强度的定量关系。

Abstract

To investigate the quantitative relationship between pore distribution characteristics and the compressive strength of medium-to-high strength concrete, we conducted comprehensive compressive strength tests by using a low-field nuclear magnetic resonance (NMR) imaging analysis system in conjunction with a fully automatic pressure testing machine. By validating and modifying the Ryshkewitch semi-empirical equation model, we established the quantitative relationship model between pore distribution characteristics and compressive strength. Test results demonstrate several key findings. First, an increase in sand rate and initial entrapped air content of concrete leads to a gradual increase in porosity. Increasing the initial air content proves to be more effective in generating a more variable porosity compared to increasing the sand rate. Specifically, by increasing the sand rate, the percentage of non-capillary pores increases by 17.2% while the percentage of capillary pores decreases by 13.0%. On the other hand, increasing the initial air content results in a 12.7% increase in capillary pores and a 12.6% decrease in gel pores. By employing the model based on modified Ryshkewitch semi-empirical equation, we achieved accurate results with an R² value close to 1 and a P-value less than 0.05, effectively describing the quantitative relationship between pore distribution characteristics and compressive strength.

导出引用

杨帅, 毛海涛, 刘畅, 王晓菊. 中高强混凝土抗压强度与气孔分布特征关系模型研究[J]. raybet体育在线院报. 2024, 41(4): 194-202 https://doi.org/10.11988/ckyyb.20221442

YANG Shuai, MAO Hai-tao, LIU Chang, WANG Xiao-ju. Modeling the Relationship between Compressive Strength and Pore Distribution Characteristics of Medium-to-High Strength Concrete[J]. Journal of Changjiang River Scientific Research Institute. 2024, 41(4): 194-202 https://doi.org/10.11988/ckyyb.20221442

中图分类号： TU528.31

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