海水环境下混凝土的断裂能及其应变软化

张鹏; 孙志伟; 赵铁军; Wittmann F H

doi:10.11835/j.issn.1674-4764.2010.01.014

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海水环境下混凝土的断裂能及其应变软化

更新时间：2023-11-28

- 海水环境下混凝土的断裂能及其应变软化
- Fracture Energy and Strain Softening ofConcrete under Seawater Environment
- 土木与环境工程学报（中英文） 2010年32卷第1期页码：72-77
- 作者机构：
  
  1. 青岛理工大学耐久性与可持续发展研究中心,山东,青岛,266033
  2. Aedificat Institute Freiburg,Freiburg,Germany
- 作者简介：
- 基金信息：
  
  国家自然科学基金重点项目(50739001);山东省自然科学基金(ZR2009FQ014);国家重点基础研究发展计划(973计划2009CB623203)
- DOI：10.11835/j.issn.1674-4764.2010.01.014
  中图分类号：
- 纸质出版：2010
- 稿件说明：
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张鹏, 孙志伟, 赵铁军, 等. 海水环境下混凝土的断裂能及其应变软化[J]. 土木与环境工程学报（中英文）, 2010,32(1):72-77.

ZHANG Peng, SUN Zhiwei, ZHAO Tiejun, et al. Fracture Energy and Strain Softening ofConcrete under Seawater Environment[J]. Journal of Civil and Environmental Engineering, 2010, 32(1): 72-77.
张鹏, 孙志伟, 赵铁军, 等. 海水环境下混凝土的断裂能及其应变软化[J]. 土木与环境工程学报（中英文）, 2010,32(1):72-77. DOI： 10.11835/j.issn.1674-4764.2010.01.014.

ZHANG Peng, SUN Zhiwei, ZHAO Tiejun, et al. Fracture Energy and Strain Softening ofConcrete under Seawater Environment[J]. Journal of Civil and Environmental Engineering, 2010, 32(1): 72-77. DOI： 10.11835/j.issn.1674-4764.2010.01.014.

摘要

通过带切口梁的三点弯曲试验和楔形劈拉试验，对完全干燥、半干燥、水浸泡、海水浸泡和5%、23.4%NaCl溶液浸泡的6种不同含水状态的混凝土试件进行了测试，根据荷载位移曲线和逆向分析，计算得到混凝土的断裂能及其应变软化曲线。结果表明，随着混凝土中水、海水和高浓度盐溶液的侵入，孔隙溶液中液体的表面张力不断增大，造成表面能下降，承载力随之降低，水浸泡后混凝土的最大承载力较干燥时降低19.6%（三点弯曲）和14.5%（楔形劈拉），海水浸泡后下降28.9%和21.7%，高浓度盐溶液浸泡后降幅更大；海水和盐溶液浸泡时后，混凝土断裂能损失24%以上，软化阶段的开裂韧性也明显降低，裂缝更易形成和扩展。从表面能、断裂能和应变软化的角度研究了海水侵入对混凝土材料造成的不利影响。

Abstract

Both Three Points Bending (TPB) test on notched beams and Wedge Splitting Test (WST) were carried out on concrete specimens under six different conditions

under which they were totally dry

partially dry

water immersed

seawater immersed

5% and 23.4% NaCl solution immersed

respectively. The fracture energy of each type of concrete and their strain softening curves were calculated according to the forcedisplacement diagrams and inverse analysis method. It was indicated that with water

seawater or salt solution penetrating into concrete

the surface tension of pore liquids in concrete increased

which resulted in the decrease of the surface energy and load bearing capacity of concrete. After water immersed

the maximum bearing loads of specimens’ were reduced by 19.6% (TPB) and 14.5% (WST) compared with those of totally dry concrete. And for those of seawater immersed

28.9% and 21.7% were reduced respectively. Furthermore

fracture energy of concrete was decreased more than 24% and fracture toughness was reduced significantly as well for concrete with high concentration salt solution

which made crack formation in concrete easier. The adverse influence of seawater on concrete materials had been investigated in detail from the aspects of surface energy

fracture energy and strain softening.

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