常温养护型超高性能混凝土的圆环约束收缩性能*

doi:10.11896/j.issn.1005-023X.2017.023.006

CLDB

2017, Vol. 31

Issue (23): 52-57 https://doi.org/10.11896/j.issn.1005-023X.2017.023.006

专题栏目：超高性能混凝土及其工程应用

常温养护型超高性能混凝土的圆环约束收缩性能^*

王俊颜¹, 边晨¹, 肖汝诚², 马骉³, 刘国平⁴

1 同济大学先进土木工程材料教育部重点实验室,上海201804;
2 同济大学土木工程学院,上海200092;
3 上海市政工程设计研究总院(集团)有限公司,上海200092;
4 上海罗洋新材料科技有限公司,上海200092

Restrained Shrinkage Behavior of Ultra High Performance Concrete Without Thermal Curing

WANG Junyan¹, BIAN Chen¹, XIAO Rucheng², MA Biao³, LIU Guoping⁴

1 Key Laboratory of Advanced Civil Engineering Materials of the Ministry of Education, Tongji University, Shanghai 201804;
2 College of Civil Engineering, Tongji University, Shanghai 200092;
3 Shanghai Municipal Engineering Design Institute(Group) Co., Ltd., Shanghai 200092;
4 Shanghai Royang Innovative Materials Technologies Co., Ltd., Shanghai 200092

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摘要研究了HCSA膨胀剂3种掺量(0%、3%、6%)下常温养护型超高性能混凝土(Ultra high performance concrete,UHPC)的圆环约束收缩性能,包括:(1) UHPC轴拉应力应变曲线测试;(2) 根据GB/T50082的UHPC自由收缩实验;(3) 根据ASTM C1581的UHPC圆环约束实验。结果表明,3种UHPC的极限拉伸应变均高于3 000με,28 d总收缩值分别为1 005.6με、600.0με、462.2με,并且在圆环约束作用下转化为残余应变、弹性拉应变和塑性拉应变,其中塑性拉应变分别为700.4με、437.9με、389.9με。3种UHPC在拉伸应变达到1 000με时及圆环约束实验中均未发现0.01 mm以上的可检测裂缝。基于拉伸实验和声发射损伤分析方法对UHPC进行应变分析,可知具有应变强化段的3种UHPC在圆环约束实验中的塑性变形以小于0.01 mm的多点分布微裂纹形式存在。通过添加HCSA膨胀剂对常温养护型UHPC进行收缩补偿,可有效地降低UHPC自身的拉应力以及对原有结构的影响。

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关键词: 超高性能混凝土自由收缩圆环约束试验轴拉应力应变曲线塑性变形 HCSA膨胀剂

Abstract: Restrained shrinkage behavior of ultra high performance concrete (UHPC) incorporating different HCSA expansion agent dosages (0%, 3%, 6%) without thermal curing was investigated by ring test, including three parts: (1) direct tensile stress-strain test of UHPC; (2) free shrinkage test of UHPC according to GB/T 50082; (3) restrained ring-test of UHPC according to ASTM C1581. The results indicated that three types of UHPC all achieved ultimate tensile strain higher than 3 000με. The 28 d free shrinkage values of three types of UHPC were 1 005.6με, 600.0με, 462.2με respectively, which converted into residual strain, elastic tensile strain and plastic tensile strain under ring restraint whose values were 700.4με, 437.9με, 389.9με, respectively. None of the three kinds of UHPC shows a crack wider than 0.01 mm both in the direct tensile test before a tensile strain of 1 000με and in the ring test. The plastic tensile deformation mechanism of UHPC based on the direct tensile test and acoustic emission (AE) analysis method shows that the tensile stress-strain curves of the three kinds of UHPC all have the strain-hardening properties and their plastic deformation presents in the form of multiple cracks smaller than 0.01 mm in the ring test. Adding HCSA expansion agent can effectively reduce the tensile stress of UHPC and influence of UHPC on the structure.

Key words: ultra high performance concrete free shrinkage restrained ring-test tensile stress-strain curve plastic deformation HCSA expansion agent

出版日期: 2017-12-10 发布日期: 2018-05-08

ZTFLH:

TU528

基金资助: *上海市浦江人才计划基金项目(16PJ1409900); 国家自然科学基金青年项目(51609172); 上海市科委项目(17DZ1204200)

作者简介: 王俊颜:男,1982年生,博士,研究员,博士研究生导师,主要从事超高性能水泥基结构材料(UHPC、ULCC等)的研究 E-mail: wangjunyan@tongji.edu.cn

引用本文:

王俊颜, 边晨, 肖汝诚, 马骉, 刘国平. 常温养护型超高性能混凝土的圆环约束收缩性能^*[J]. CLDB, 2017, 31(23): 52-57.
WANG Junyan, BIAN Chen, XIAO Rucheng, MA Biao, LIU Guoping. Restrained Shrinkage Behavior of Ultra High Performance Concrete Without Thermal Curing. Materials Reports, 2017, 31(23): 52-57.

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http://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2017.023.006 或 http://www.mater-rep.com/CN/Y2017/V31/I23/52

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