自密实混凝土自生约束收缩下应力松弛性能研究

王国杰; 刘积丁; 郑建岚

doi:10.13409/j.cnki.jdpme.2019.01.012

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自密实混凝土自生约束收缩下应力松弛性能研究

论文 | 更新时间：2025-12-11

- 自密实混凝土自生约束收缩下应力松弛性能研究
- Study on the Stress Relaxation Properties Induced in Restrained Autogenous Shrinkage of Self-compacting Concrete
- 防灾减灾工程学报 2019年39卷第1期页码：82-88
- 作者机构：
- 作者简介：
- 基金信息：
  
  国家自然科学基金项目（51578153）;福建省教育厅科研项目A类产学研项目（JA15529）资助
- DOI：10.13409/j.cnki.jdpme.2019.01.012
  中图分类号： U528
- 纸质出版：2019
- 稿件说明：
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[1]王国杰,刘积丁,郑建岚.自密实混凝土自生约束收缩下应力松弛性能研究[J].防灾减灾工程学报,2019,39(01):82-88.

王国杰, 刘积丁, 郑建岚. Study on the Stress Relaxation Properties Induced in Restrained Autogenous Shrinkage of Self-compacting Concrete[J]. 2019, 39(1): 82-88.
[1]王国杰,刘积丁,郑建岚.自密实混凝土自生约束收缩下应力松弛性能研究[J].防灾减灾工程学报,2019,39(01):82-88. DOI： 10.13409/j.cnki.jdpme.2019.01.012.

王国杰, 刘积丁, 郑建岚. Study on the Stress Relaxation Properties Induced in Restrained Autogenous Shrinkage of Self-compacting Concrete[J]. 2019, 39(1): 82-88. DOI： 10.13409/j.cnki.jdpme.2019.01.012.

摘要

以水胶比、胶凝材料用量为主要参数

研究较长龄期内自密实混凝土的自由自生收缩性能及圆环约束收缩下钢环应变的发展规律

通过分析得到自密实混凝土在自生约束收缩下的应力松弛性能。结果表明:自密实混凝土自生变形在经过1d左右的小幅膨胀后开始收缩

3～7d内收缩增长较快

接下来在长达100d的测试过程中缓慢而持续地增长;自生收缩在受约束时应力增长也有类似的规律。自生约束收缩引起的应力松弛主要发生在3～7d的早龄期

之后应力松弛的增长几乎停滞;自密实混凝土的应力松弛率随水胶比的提高显著增大

随胶结料用量的增加有增大的趋势。

Abstract

Internal stress development and stress relaxation induced by restrained autogenous shrinkage of self-compacting concrete（SCC）were investigated under different water/binder ratios and different amounts of cementitious material.Test results show that the free autogenous deformation expanded within 1 dand then shrank rapidly from 3 dto 7 d;afterward

the autogenous shrinkage grew slowly and steadily.The development of stress during restrained autogenous shrinkage also had a similar trend.The stress relaxation mainly developed at early ages within 7 d

and then its growth was almost stagnant.The stress relaxation rate of SCC increased significantly with the increase of water/binder ratio;it also increased with increasing cementitious contents.

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references

混凝土早期约束应力发展与松弛过程研究 [D]. 李飞. 清华大学 2009

自密实混凝土自生约束收缩下应力松弛性能研究 [D]. 刘积丁. 福州大学 2017

A fracture mechanics-based method for prediction of cracking of circular and elliptical concrete rings under restrained shrinkage [J] . Wei Dong,Xiangming Zhou,Zhimin Wu. Engineering Fracture Mechanics . 2014

Assessing residual stress development and stress relaxation in restrained concrete ring specimens [J] . Akhter B. Hossain,Jason Weiss. Cement and Concrete Composites . 2003 (5)

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