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硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (8): 2609-2621.

• 水泥混凝土 • 上一篇    下一篇

混凝土内部湿度场与自约束应力场的研究

钟卓1, 黄乐鹏2, 张恒1   

  1. 1.中建四局第三建设有限公司,遵义 563099;
    2.重庆大学土木工程学院,重庆 400044
  • 收稿日期:2021-02-07 修回日期:2021-04-18 出版日期:2021-08-15 发布日期:2021-09-02
  • 通讯作者: 黄乐鹏,博士,副研究员。E-mail:63602122@qq.com
  • 作者简介:钟 卓(1976—),男,高工。主要从事建筑工程施工方面的研究。E-mail:295140427@qq.com

Research on Humidity Field and Self Restraint Stress Field in Concrete

ZHONG Zhuo1, HUANG Lepeng2, ZHANG Heng1   

  1. 1. CCFED the Third Construction Ltd., Zunyi 563099, China;
    2. School of Civil Engineering, Chongqing University, Chongqing 400044, China
  • Received:2021-02-07 Revised:2021-04-18 Online:2021-08-15 Published:2021-09-02

摘要: 为防治混凝土自约束作用导致的开裂现象,对混凝土内部湿度场和自约束应力场开展了研究。通过位移传感器、温湿度传感器对不同强度、养护条件下的混凝土收缩、内部温度和湿度进行测试。之后,通过理论推导,建立混凝土内部湿度、应变与内部湿度关系的理论计算模型。研究表明,混凝土内部湿度随着水泥水化作用和干燥作用的增强而降低。混凝土湿度扩散系数是表征其内部湿度的函数,随着与干燥面的间距增加,混凝土内部湿度扩散系数增大。混凝土的收缩变形与内部湿度之间存在显著的相关性,计算模型与试验结果拟合良好。混凝土内部湿度场的存在导致了应变梯度的存在,进而使混凝土内部产生自约束应力。相同环境条件下,高强混凝土内部自约束应力高于普通强度混凝土。

关键词: 混凝土, 收缩应力, 内约束, 内部湿度场, 自约束应力场

Abstract: In order to prevent the cracking of concrete caused by internal restraint, the internal humidity field and self restraint stress field of concrete were studied in this paper. The shrinkage, internal temperature and humidity of concrete under different strength and curing conditions were tested by displacement sensors, temperature and humidity sensors. Afterwards, through theoretical derivation, a theoretical calculation model for the internal humidity, relationship betweenstrain and internal humidity of concrete were established. Studies indicate that the humidity in concrete decreases with the increase of cement hydration and drying. The moisture diffusion coefficient of concrete is a function of its internal humidity. As the distance from the drying surface increases, the internal moisture diffusion coefficient of concrete increases. There is a significant correlation between the shrinkage deformation and the internal humidity of concrete. The calculation model proposed in this paper is in good agreement with the experimental results. The existence of the humidity field in concrete leads to the existence of a strain gradient, which in turn causes the self restraint stress in concrete. Under the same environmental conditions, the internal self restraint stress of high-strength concrete is higher than that of ordinary-strength concrete.

Key words: concrete, shrinkage stress, internal restraint, internal humidity field, self restraint stress field

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