[1]王俊豪,杨树桐,孙忠科.高温后碱激发海砂混凝土无尺寸效应断裂参数的预测[J].西安建筑科技大学学报(自然科学版),2022,54(02):220-227.[doi:10.15986/j.1006-7930.2022.02.008]
　WANG Junhao,YANG Shutong,SUN Zhongke.Prediction of fracture parameters without size effect of Alkali-activated sea sand concrete exposed to elevated temperature[J].J. Xi’an Univ. of Arch. & Tech.(Natural Science Edition),2022,54(02):220-227.[doi:10.15986/j.1006-7930.2022.02.008]
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高温后碱激发海砂混凝土无尺寸效应断裂参数的预测()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
54
期数:
2022年02期
页码:
220-227
栏目:
出版日期:
2022-04-28

文章信息/Info

Title:
Prediction of fracture parameters without size effect of Alkali-activated sea sand concrete exposed to elevated temperature
文章编号:
1006-7930(2022)02-0220-08
作者:
王俊豪; 杨树桐; 孙忠科
(中国海洋大学 工程学院,山东 青岛 266100)
Author(s):
WANG Junhao;  YANG Shutong;  SUN Zhongke
(Department of Civil Engineering, College of Engineering in Ocean University of China, Shandong Qingdao 266100, China)
关键词:
碱激发海水海砂混凝土;  高温后;  抗压强度;  抗拉强度;  无尺寸效应断裂参数
Keywords:
Alkali-activated sea sand concrete;  exposed to elevated temperature;  compressive strength;  tensile strength;  fracture parameters without size effect
分类号:
TU501
DOI:
10.15986/j.1006-7930.2022.02.008
文献标志码:
A
摘要:
海洋环境中服役的结构在受到高温侵蚀作用后产生的损伤是不可估量的.碱激发海砂混凝土抵抗裂缝展开的能力需要被评估后才可以将其应用于海洋环境中.然而混凝土内部通常是不均匀的以及不连续的,并且这种情况在高温作用后会更加明显.为了探究这个问题,本文研究了两种不同矿渣粉(GGBFS)/粉煤灰(FA)质量比海水、海砂拌制的碱激发海砂混凝土在加热制度为10 ℃/min、恒温时间为180 min的情况下加热到200 ℃、400 ℃、600 ℃以及800 ℃的目标温度后的残余力学性能、微观表现以及基于边界效应模型(BEM)通过标准三点弯梁试验对无尺寸效应断裂参数抗拉强度ft和断裂韧度KIC的预测.研究发现:随着高温温度升高,ft和KIC逐渐降低并且降低速度越来越大.在400 ℃以下,更高GGBFS/FA质量比的碱激发海砂混凝土预测得到的断裂参数值比低GGBFS/FA质量比的混凝土高; 超过400 ℃后,前者强度损失更大并且其残余强度明显低于后者.
Abstract:
The damage to structures in service in the marine environment after exposure to the erosive effects of high temperature is incalculable. The ability of alkali-stimulated marine sand concrete to resist crack development needs to be assessed before it can be used in a marine environment. However, concrete is often internally heterogeneous as well as discontinuous, and this becomes more pronounced after high temperatures. In order to explore this problem, this paper studied the residual mechanical properties and microscopic performance of alkali-activated sea sand concrete mixed with seawater and sea sand with two different mass ratios of ground granulated blast-furnace slag( GGBFS )/ fly ash( FA )when heated to 200 ℃, 400 ℃, 600 ℃ and 800 ℃ under the heating system of 10 ℃/min and constant temperature time of 180 min, and based on Boundary Effect Model(BEM), the tensile strength ft and fracture toughness KIC of fracture parameters without size effect were predicted through the standard three-point bending beam test. It was found that with the increase of high temperature, the ft and KIC gradually decreased and the decrease rate was increasing. Below 400 ℃, the predicted fracture parameters of alkali-activated sea sand concrete with higher GGBFS/FA mass ratio were higher than those of concrete with lower GGBFS/FA mass ratio. When the temperature exceeded 400 ℃, the strength loss of the former was greater and its residual strength was significantly lower than that of the latter.

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备注/Memo

备注/Memo:
收稿日期:2021-04-01修改稿日期:2021-04-19
基金项目:国家自然科学基金(52178259); 山东省重点研发项目(2019GSF111059)
第一作者:王俊豪(1996—),男,硕士,主要从事碱激发混凝土力学性能研究.E-mail:3037367818@qq.com 通信作者:杨树桐(1979—),男,教授,博士生导师,主要从事混凝土断裂力学研究.E-mail:shutongyang2013@163.com
更新日期/Last Update: 2022-04-28