电伴热预养护条件对混凝土受冻临界强度的影响

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (6): 1990-1997.

所属专题：水泥混凝土

电伴热预养护条件对混凝土受冻临界强度的影响

刘仲洋^1,2,3, 付帅², 马国伟¹, 王山², 李冰阳², 杨晗², 崔秀军², 张周²

1.河北工业大学土木与交通学院,天津 300401;
2.河北建筑工程学院土木工程学院,张家口 075051;
3.河北省土木工程诊断、改造与抗灾重点实验室,张家口 075051

收稿日期:2022-01-21 修订日期:2022-02-26 出版日期:2022-06-15 发布日期:2022-07-01
作者简介:刘仲洋(1979—),男,博士研究生,副教授。主要从事新材料与新结构的研究。E-mail:smartlzy@sina.com
基金资助:
河北省教育厅自然科学重点项目(ZD2021041)

Effect of Electric Heat Tracing Pre-Curing Condition on Critical Strength of Concrete

LIU Zhongyang^1,2,3, FU Shuai², MA Guowei¹, WANG Shan², LI Bingyang², YANG Han², CUI Xiujun², ZHANG Zhou²

1. School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China;
2. Department of Civil Engineering, Hebei University of Architecture, Zhangjiakou 075051, China;
3. Hebei Key Laboratory for Diagnosis, Reconstruction and Anti-Disaster of Civil Engineering, Zhangjiakou 075051, China

Received:2022-01-21 Revised:2022-02-26 Online:2022-06-15 Published:2022-07-01

摘要/Abstract

摘要： 电伴热预养护是一种保证预拌混凝土冬期施工养护温度和强度增长的简单高效的方法。本文采用7 d恒负温(-5 ℃、-10 ℃、-15 ℃)一次冻结转标准养护的试验,研究电伴热预养护不同温度和时间对一种高坍落度C30普通混凝土抗压强度的影响。依据混凝土受冻临界强度的定义,确定基于电伴热预养护条件下的混凝土受冻临界强度值及其合理的预养护时间。结果表明:与标准养护相比,经电伴热高温预养护的混凝土抗压强度均得到了提高,但电伴热预养护温度宜控制在30 ℃,较高的预养护温度下强度发展速率和R_-7+28(负温养护7 d再转标养28 d的抗压强度)值反而降低;当预养护温度为30 ℃,硬化温度不低于-15 ℃时,合理的预养护时间在36～48 h之间;恒负温(-5 ℃、-10 ℃、-15 ℃)硬化条件下,采用电伴热预养护的混凝土受冻临界强度的范围是6.6～17.8 MPa,为混凝土立方体抗压强度标准值的22.0%～59.3%。研究旨在比较电伴热预养护制度对普通混凝土力学性能的影响,进而指导相关工程应用。

关键词: 电伴热, 预拌混凝土, 受冻临界强度, 抗压强度, 预养护温度, 预养护时间, 恒负温

Abstract: Electric heat tracing pre-curing is a simple and efficient method to ensure the curing temperature and strength development of ready-mixed concrete in cold weather. The research analyzed the effects of pre-curing temperature and aging on the compressive strength of a high slump C30 normal concrete. Tests of 7 d constant negative temperature (-5 ℃, -10 ℃, -15 ℃) once-freezing to standard curing pretreatment test were reported. According to the definition of critical strength, the reasonable critical strength values and pre-curing time under the electric heat tracing pre-curing treatment were acquired. The results show that concretes pre-cured by electric heat tracing subjected to high temperatures attain higher compressive strengths than concretes subjected to normal temperature. Nevertheless, the pre-curing temperature should be controlled at 30 ℃, because the rate of strength development and R_-7+28 (compressive strength of negative temperature curing for 7 d and then standard curing for 28 d) are reduced at higher pre-curing temperatures. When the pre-curing temperature is 30 ℃ and the hardening temperature is not lower than -15 ℃, the pre-curing time is between 36 h and 48 h. Under the hardening condition of constant negative temperature (-5 ℃, -10 ℃, -15 ℃), the critical strength of concrete pre-cured with electric heat tracing is in the range of 6.6 MPa to 17.8 MPa, which is 22.0% to 59.3% of the standard value for the compressive strength of concrete cubes. This paper aims to compare the influence of electric heat tracing pre-curing treatment on the mechanical properties of common concrete and to guide the relevant engineering applications.

Key words: electric heat tracing, ready-mixed concrete, critical strength, compressive strength, pre-curing temperature, pre-curing time, constant negative temperature

中图分类号:

TU528.1

刘仲洋, 付帅, 马国伟, 王山, 李冰阳, 杨晗, 崔秀军, 张周. 电伴热预养护条件对混凝土受冻临界强度的影响[J]. 硅酸盐通报, 2022, 41(6): 1990-1997.

LIU Zhongyang, FU Shuai, MA Guowei, WANG Shan, LI Bingyang, YANG Han, CUI Xiujun, ZHANG Zhou. Effect of Electric Heat Tracing Pre-Curing Condition on Critical Strength of Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(6): 1990-1997.

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电伴热预养护条件对混凝土受冻临界强度的影响

Effect of Electric Heat Tracing Pre-Curing Condition on Critical Strength of Concrete

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