骨料种类对超高性能混凝土性能影响机理研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (9): 3164-3172.

骨料种类对超高性能混凝土性能影响机理研究

吴晓刚^1,2, 杨健辉¹, 袁冬冬¹, 田道坡¹, 李志超¹, 王庭辉¹

1.河南理工大学土木工程学院,焦作 454003;
2.明珠建设集团有限公司,金华 321300

收稿日期:2024-01-15 修订日期:2024-03-21 出版日期:2024-09-15 发布日期:2024-09-19
通信作者: 杨健辉,博士,教授。E-mail:jianhui_yang@sohu.com
作者简介:吴晓刚(1988—),男,博士研究生。主要从事土木工程材料、结构及动力学响应的研究。E-mail:xiaogang_wu@hpu.edu.cn
基金资助:
国家自然科学基金联合基金重点支持项目(U2244228);河南省面上科学基金项目(222300420446);河南省科技攻关项目(222102320117);河南省重点研发与推广专项(222102320410);河南省高等学校重点科研项目计划(24B560009)

Mechanism of Aggregate Type Influence on Properties of Ultra-High Performance Concrete

WU Xiaogang^1,2, YANG Jianhui¹, YUAN Dongdong¹, TIAN Daopo¹, LI Zhichao¹, WANG Tinghui¹

1. College of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China;
2. Pearl Construction Group, Jinhua 321300, China

Received:2024-01-15 Revised:2024-03-21 Published:2024-09-15 Online:2024-09-19

摘要/Abstract

摘要： 骨料优选可以弥补超高性能混凝土(UHPC)成本高、收缩大的缺陷。本文先以不同体积比河砂和陶砂混掺制作UHPC,并进行测试,确定陶砂替代河砂体积率为12.5%~25.0%时UHPC性能优异。然后利用石英砂、河砂和陶砂单掺及陶砂替代河砂体积率12.5%混掺制备UHPC,采用宏细观测试手段分析骨料对UHPC性能影响机理。结果表明,轻骨料内养护作用不仅能降低UHPC收缩,还可以显著改善界面区孔隙结构,提升混凝土劈裂抗拉强度和抗压强度。河砂骨料相比石英砂骨料主要区别在表面结构特征更粗糙和不规则,由其制备的UHPC工作性能稍差,但界面区孔隙结构更优。采用熵权法以坍落度、抗压强度、劈裂抗拉强度和56 d收缩为综合评价指标,虽然河砂骨料UHPC抗压强度高于石英砂骨料UHPC,但在其他方面存在劣势。陶砂替代河砂体积率在12.5%~50.0%时,混掺骨料UHPC综合性能高于石英砂骨料UHPC。

关键词: 骨料, 超高性能混凝土, 工作性能, 收缩, 强度

Abstract: Aggregate optimization can compensate for the high cost and shrinkage of ultra-high performance concrete (UHPC). In this paper, different volume ratios of river sand and pottery sand were used as aggregates to produce UHPC, and it was determined through testing that the performance of UHPC was excellent when the volume ratio of pottery sand replacing river sand was in the range of 12.5% to 25.0%. Then UHPC was prepared by quartz sand, river sand and pottery sand, as well as mixing of pottery sand and river sand. The mechanism of aggregate influence on the physical and mechanical properties of UHPC was analyzed using macroscopic and microscopic testing methods. The results show that the internal curing effect of lightweight aggregate not only reduce the shrinkage of UHPC, but also significantly improve the pore structure in the interfacial zone and enhance the splitting tensile and compressive strength of concrete. Compared with quartz sand aggregate, river sand aggregate has a rougher and irregular surface, from which UHPC is prepared with relatively poor workability but better pore structure in the interfacial zone. Taking slump, compressive strength, splitting tensile strength and 56 d shrinkage as the comprehensive evaluation indexes, although the compressive strength of river sand aggregate UHPC is not lower than that of quartz sand aggregate UHPC, there is no advantage in other indexes. The combined performance of mixed aggregate UHPC is higher than that of quartz sand aggregate UHPC when the volume ratio of pottery sand replacing river sand is in the range of 12.5% to 50.0%.

Key words: aggregate, ultra-high performance concrete, workability, shrinkage, strength

中图分类号:

TU528

吴晓刚, 杨健辉, 袁冬冬, 田道坡, 李志超, 王庭辉. 骨料种类对超高性能混凝土性能影响机理研究[J]. 硅酸盐通报, 2024, 43(9): 3164-3172.

WU Xiaogang, YANG Jianhui, YUAN Dongdong, TIAN Daopo, LI Zhichao, WANG Tinghui. Mechanism of Aggregate Type Influence on Properties of Ultra-High Performance Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(9): 3164-3172.

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