(内蒙古农业大学水利与土木建筑工程学院, 呼和浩特 010018)

摘要: 为了研究风积沙对不同种类引气混凝土强度和孔结构的影响,利用风积沙替代部分河砂作为混凝土细骨料,并采用皂苷和烷基两种引气剂配制风积沙引气混凝土,从抗压强度、劈裂抗拉强度与核磁共振孔结构等方面分析风积沙掺量对引气混凝土强度及孔结构的影响,利用分形理论对不同风积沙掺量下引气混凝土孔结构分形维数进行分析. 研究结果表明:掺入适量风积沙可以提高引气混凝土的强度,风积沙引气混凝土能够满足 C25 强度设计要求;风积沙引气混凝土核磁共振 T2 谱呈现明显“三峰”结构,且风积沙引气混凝土核磁共振孔结构具有一定分形特征,其孔结构分形维数具有分段性. 该研究可为风积沙引气混凝土强度及孔结构发展规律提供数据支撑.

关键词: 风积沙混凝土; 皂苷引气剂; 烷基引气剂; 抗压强度; 劈裂抗拉强度; 孔结构; 分形维数

中图分类号:TU528 文献标志码:A 文章编号:1002⁃848X(2022)08⁃0112⁃06

DOI:10. 19701 / j.jzjg.LS210181

Influence of aeolian sand on strength and pore structure of air⁃entrained concrete

XUE Huijun, ZHENG Jianting, ZOU Chunxia, LI Hao

(College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China)

Abstract: In order to study the influence of aeolian sand on the strength and pore structure of different types ofair⁃entrained concrete, aeolian sand was used to replace part of river sand as concrete fine aggregate, and aeolian sandair⁃entrained concrete was prepared with saponins and alkyl air⁃entraining agents, and the influence of aeolian sand contenton the strength and pore structure of air⁃entrained concrete were analyzed from the aspects of compressive strength, splittensile strength and nuclear magnetic resonance pore structure. Fractal dimension of air⁃entrained concrete pore structureunder different aeolian sand content was analyzed by fractal theory. The study results show that mixing a proper amount ofaeolian sand can increase the strength of air⁃entrained concrete. Aeolian sand air⁃entrained concrete can meet the C25strength design requirements. The nuclear magnetic resonance T2spectrum of aeolian sand air⁃entrained concrete presentsan obvious " three peaks" structure, and the nuclear magnetic resonance pore structure of aeolian sand air⁃entrainedconcrete has certain fractal characteristics, and nuclear magnetic resonance fractal dimension is segmented. The study canprovide data support for the strength characteristics and pore structure development law of aeolian sand air⁃entrainedconcrete.

Keywords:aeolian sand concrete; saponin air⁃entraining agent; alkyl air⁃entraining agent; compressive strength; splittensile strength; pore structure; fractal dimension

∗内蒙古自然科学基金项目(2020BS05008),内蒙古科技重大专项项目(2021ZD0007),内蒙古农业大学引进人才科研启动项目(NDYB2018-40).

第一作者:薛慧君,博士,讲师,主要从事新型混凝土材料与结构研究,Email:xuehuijun@ yeah.net.

[引用本文] 薛慧君,郑建庭,邹春霞,等. 风积沙对引气混凝土强度及孔结构的影响[J]. 建筑结构,2022,52(8):112⁃117. XUE Huijun, ZHENG Jianting, ZOU Chunxia, et al. Influence of aeolian sand on strength and pore structure ofair⁃entrained concrete[J]. Building Structure,2022,52(8):112⁃117.