邱继生;杨占鲁;关虓;邢敏;张程华;秦卿;

• 1:西安科技大学建筑与土木工程学院

摘要(Abstract)：

为了研究煤矸石陶粒对混凝土微观孔结构特征和抗压强度的影响,基于低场核磁共振(NMR)技术,对煤矸石陶粒体积取代率(0%,20%,40%,60%)的混凝土进行试验,测定煤矸石陶粒混凝土T2弛豫时间谱,进而转化为孔径分布曲线,并计算煤矸石陶粒混凝土孔隙率、最可几孔径和孔级占比等微观孔结构特征,同时通过力学性能试验测试不同取代率煤矸石陶粒混凝土的抗压强度。研究结果表明:煤矸石陶粒掺入混凝土后具有细化孔隙的作用,随着煤矸石陶粒取代率的增加,孔隙率先增大后有所减小,且无害孔占比和少害孔占比增多,有害孔占比和多害孔占比减少,最可几孔径减小,能够有效改善混凝土的微观孔结构特征。此外,随着煤矸石陶粒取代率增大,试件的抗压强度先变小,再由小变大,最后再变小,其中取代率40%时,其抗压强度最优。通过对煤矸石陶粒混凝土孔结构特征的测试,为分析煤矸石陶粒混凝土的耐久性能提供了一定的微观基础。

关键词(KeyWords)： 低场核磁共振;煤矸石陶粒混凝土;取代率;微观孔结构;抗压强度

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(51808443);; 陕西省自然科学基础研究计划(2018JM5167);; 中国博士后科学基金(2017M613166)

作者(Author): 邱继生;杨占鲁;关虓;邢敏;张程华;秦卿;

Email:

DOI: 10.13800/j.cnki.xakjdxxb.2020.0115

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