早期受冻损伤混凝土应力-应变试验研究

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (6): 2026-2033.

早期受冻损伤混凝土应力-应变试验研究

连海东^1,2, 田青青^1,2, 徐存东^1,2,3, 高懿伟⁴

1.华北水利水电大学水利学院,郑州 450046;
2.河南省水工结构安全工程技术研究中心,郑州 450046;
3.浙江省农村水利水电资源配置与调控关键技术重点实验室,杭州 310018;
4.河海大学水利水电学院,南京 210098

收稿日期:2021-02-24 修回日期:2021-03-28 出版日期:2021-06-15 发布日期:2021-07-08
作者简介:连海东(1990—),男,助教。主要从事水工结构优化设计和耐久性研究。E-mail:lianhaidong@ncwu.edu.cn
基金资助:
国家自然科学基金(51579102);河南省高校科技创新团队支持计划(19IRTSTHN030);中原科技创新领军人才支持计划(204200510048);河南省高等学校重点科研项目(20A570006);河南省科技攻关项目(212102310273);浙江省重点研发计划(2021C03019)

Experimental Study on Stress-Strain of Concrete Damaged by Early Freezing

LIAN Haidong^1,2, TIAN Qingqing^1,2, XU Cundong^1,2,3, GAO Yiwei⁴

1. School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, China;
2. Henan Provincial Hydraulic Structure Safety Engineering Research Center, Zhengzhou 450046, China;
3. Key Laboratory for Technology in Rural Water Management of Zhejiang Province, Hangzhou 310018, China;
4. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China

Received:2021-02-24 Revised:2021-03-28 Online:2021-06-15 Published:2021-07-08

摘要/Abstract

摘要： 北方地区混凝土冬季施工过程,新浇筑混凝土容易因突然降温而遭受早期损伤。为研究早期受冻对混凝土单轴受压状态下力学性能的影响,通过对不同冻结温度(-5 ℃、-10 ℃)、不同起冻时刻(1.0 h、3.5 h、8.0 h、24.0 h)养护条件下的混凝土进行单轴受压试验,获得了应力-应变全曲线,拟合得到了适用于早期受冻混凝土的单轴受压本构方程。结果表明:早期受冻后混凝土应力-应变曲线在下降段更为陡峭,延性和塑性变形能力降低;冻结温度对峰值应力和峰值应变影响不明显;随起冻时刻的延后,峰值应力先下降后上升,峰值应变先上升后下降,初凝后至终凝前受冻混凝土力学性能损伤最为严重;基于过镇海教授模型拟合得到的早期受冻后混凝土应力-应变曲线方程与试验曲线吻合较好;对早期受冻混凝土峰值应力、峰值应变及延性和塑性变形能力最不利的起冻时刻均在养护4 h前后。

关键词: 早期受冻, 起冻时刻, 冻结温度, 应力-应变全曲线, 本构模型, 混凝土损伤

Abstract: During the winter construction of concrete in northern areas, the newly poured concrete often suffers damage due to sudden temperature drop. In order to study the effect of early freezing on the mechanical properties of concrete under uniaxial compression,the uniaxial compression tests of concrete under the curing conditions of different freezing temperatures (-5 ℃, -10 ℃) and different freezing moments (1.0 h, 3.5 h, 8.0 h, 24.0 h) were carried out, the full stress-strain curve under uniaxial compression was obtained, and the constitutive equation suitable for uniaxial compression of early frozen concrete was obtained by fitting. The results show that the change trend of the stress-strain curve of concrete after early freezing is basically similar to that of normal cured concrete, but in the descending section, the early frozen concrete is steeper, and the ductility and plastic deformation ability are reduced. The freezing temperature has no obvious effect on the peak stress and peak strain. With the delay of the freezing time, the peak stress first drops and then rises, and the peak strain first rises and then drops. The mechanical properties of frozen concrete after the initial setting and before the final setting are the most severely damaged. The stress-strain curve equation of early frozen concrete based on the fitting of Professor Guo Zhenhai’s model is in good agreement with the experimental curve. The most unfavorable freezing point for the peak stress, peak strain, ductility and plastic deformation ability of the early frozen concrete is around 4 h after curing.

Key words: early freezing, freezing moment, freezing temperature, full stress-strain curve, constitutive model, concrete damage

中图分类号:

TU528

连海东, 田青青, 徐存东, 高懿伟. 早期受冻损伤混凝土应力-应变试验研究[J]. 硅酸盐通报, 2021, 40(6): 2026-2033.

LIAN Haidong, TIAN Qingqing, XU Cundong, GAO Yiwei. Experimental Study on Stress-Strain of Concrete Damaged by Early Freezing[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(6): 2026-2033.

参考文献

[1] 王琛艳.结构物混凝土早期抗冻能力影响因素灰色关联分析[J].硅酸盐通报,2015,34(11):3405-3411.
WANG C Y. Gray correlation analysis of factors affect the ability of structure concrete in early antifreeze[J]. Bulletin of the Chinese Ceramic Society, 2015, 34(11): 3405-3411 (in Chinese).
[2] 张翔宇,徐立丹,牛建刚.早期受冻混凝土的服役性能研究概述[J].内蒙古科技大学学报,2020,39(3):294-299.
ZHANG X Y, XU L D, NIU J G. Summary of research in the service performance of the early frozen concrete[J]. Journal of Inner Mongolia University of Science and Technology, 2020, 39(3): 294-299 (in Chinese).
[3] 崔静忠.混凝土的早期受冻[J].混凝土,1983(2):14-18.
CUI J Z. Early frost of concrete[J]. Concrete, 1983(2): 14-18 (in Chinese).
[4] 巴恒静,张惠,赵亚丁.早期受冻对混凝土强度的影响[J].低温建筑技术,2005,27(6):1-3.
BA H J, ZHANG H, ZHAO Y D. The effect of early-age frozen damage on compressive strength of concrete[J]. Low Temperature Architecture Technology, 2005, 27(6): 1-3 (in Chinese).
[5] MIN T B, CHO I S, PARK W J, et al. Experimental study on the development of compressive strength of early concrete age using calcium-based hardening accelerator and high early strength cement[J]. Construction and Building Materials, 2014, 64: 208-214.
[6] WANG H Y, ZHA X X. Axial strength of CFST columns considering concrete age[J]. Advanced Steel Construction, 2014, 10(2): 139-150.
[7] 汪青杰,张延年,刘旭峰,等.冻融时间对早期混凝土抗压性能的影响试验[J].沈阳大学学报(自然科学版),2014,26(1):61-65.
WANG Q J, ZHANG Y N, LIU X F, et al. Experimental research on compressive property of crumb rubber concrete based on freezing and thawing time[J]. Journal of Shenyang University (Natural Science), 2014, 26(1): 61-65 (in Chinese).
[8] 胡晓鹏,杨兰,杨超,等.早期受冻掺合料混凝土服役性能试验研究[J].土木建筑与环境工程,2017,39(5):93-99.
HU X P, YANG L, YANG C, et al. Experimental analysis of service performance of early frost admixture concrete[J]. Journal of Civil, Architectural & Environmental Engineering, 2017, 39(5): 93-99 (in Chinese).
[9] 胡晓鹏,彭刚,牛荻涛,等.早期受冻环境对混凝土服役期性能的影响[J].建筑材料学报,2020,23(5):1061-1070.
HU X P, PENG G, NIU D T, et al. Effect of early frost environment on service performance of concrete[J]. Journal of Building Materials, 2020, 23(5): 1061-1070 (in Chinese).
[10] 胡晓鹏,彭刚,胡长明,等.早期受冻混凝土服役期黏结性能研究[J].建筑结构学报,2020,41(1):165-172.
HU X P, PENG G, HU C M, et al. Bond properties during service period of early frozen concrete[J]. Journal of Building Structures, 2020, 41(1): 165-172 (in Chinese).
[11] QIN X C, MENG S P, CAO D F, et al. Evaluation of freeze-thaw damage on concrete material and prestressed concrete specimens[J]. Construction and Building Materials, 2016, 125: 892-904.
[12] MA Z M, WITTMANN F H, XIAO J Z, et al. Influence of freeze-thaw cycles on properties of integral water repellent concrete[J]. Journal of Wuhan University of Technology-Mater Sci Ed, 2016, 31(4): 851-856.
[13] 徐存东,程昱,王荣荣,等.带初始冻融损伤的混凝土材料受盐冻作用下性能劣化分析[J].工程科学与技术,2019,51(1):17-26.
XU C D, CHENG Y, WANG R R, et al. Analysis of performance deterioration of concrete material with initial freeze-thaw damage under salt-freezing condition[J]. Advanced Engineering Sciences, 2019, 51(1): 17-26 (in Chinese).
[14] 徐存东,高懿伟,田俊姣,等.早期受冻损伤对混凝土耐久性影响的试验研究[J].人民黄河,2021,43(2):131-136+141.
XU C D, GAO Y W, TIAN J J, et al. Experimental study on influence of early freeze injury to the durability of concrete[J]. Yellow River, 2021, 43(2): 131-136+141 (in Chinese).
[15] 闻洋,陈伟,张迎春.早期负温养护环境下橡胶混凝土强度发展及抗氯离子渗透性能研究[J].硅酸盐通报,2019,38(5):1336-1342.
WEN Y, CHEN W, ZHANG Y C. Study on strength development and resistance to chloride ion penetration of rubber concrete at early negative temperature[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(5): 1336-1342 (in Chinese).
[16] 谢开仲,刘振威,盖炳州,等.机制砂混凝土应力-应变试验研究[J].硅酸盐通报,2020,39(12):3823-3831.
XIE K Z, LIU Z W, GAI B Z, et al. Stress-strain test of manufactured sand concrete[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(12): 3823-3831 (in Chinese).
[17] HOGNESTAD E. Concrete stress distribution in ultimate strength design[J]. ACI Journal Proceedings, 1955, 52(12): 455-479.
[18] POPVICS S. A review of stress-strain relationships for concrete[J]. ACI Journal Proceedings, 1970, 67(3): 243-248.
[19] RÜSCH H. Research toward a general flexural theory[J]. Journal of ACI, 1960, 32: 1-28.
[20] 过镇海,张秀琴,张达成,等.混凝土应力-应变全曲线的试验研究[J].建筑结构学报,1982,3(1):1-12.
GUO Z H, ZHANG X Q, ZHANG D C, et al. Experimental investigation of the complete stress-strain curve of concrete[J]. Journal of Building Structures, 1982, 3(1): 1-12 (in Chinese).