常年冻土区混凝土孔隙结冰规律对抗压强度的影响

王萧萧; 刘畅; 张菊; 刘曙光; 闫长旺; 李恒

doi:10.13204/j.gyjzG20072117

常年冻土区混凝土孔隙结冰规律对抗压强度的影响

doi: 10.13204/j.gyjzG20072117

王萧萧^1,2,4,
刘畅¹,
张菊^3,4, ,,
刘曙光^3,4,
闫长旺^3,4,
李恒¹

1. 内蒙古工业大学土木工程学院, 呼和浩特 010051;
2. 内蒙古自治区土木工程结构与力学重点实验室, 呼和浩特 010051;
3. 内蒙古工业大学矿业学院, 呼和浩特 010051;
4. 生态型建筑材料与装配式结构内蒙古自治区工程研究中心, 呼和浩特 010051

基金项目:

国家自然科学基金项目（51609119，51768051）；内蒙古自治区高等学校"青年科技英才支持计划"项目（NJYT-18-B24）；内蒙古自治区科技成果转化专项资金项目（2019CG072）；中央引导地方科技发展资金项目（2021ZY0024）。

详细信息

作者简介:
王萧萧,女,1987年出生,博士。

通讯作者:
张菊,zj970941@126.com。

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出版历程
- 收稿日期: 2020-07-21
- 网络出版日期: 2022-01-11

EFFECT OF FREEZING LAWS FOR CONCRETE PORES ON COMPRESSIVE STRENGTH IN PERMAFROST REGIONS

WANG Xiaoxiao^1,2,4,
LIU Chang¹,
ZHANG Ju^{3,4
, ,},
LIU Shuguang^3,4,
YAN Zhangwang^3,4,
LI Heng¹

1. School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China;
2. Key Laboratory of Civil Engineering Structure and Mechanics, Inner Mongolia University of Technology, Hohhot 010051, China;
3. School of Mining and Technology, Inner Mongolia University of Technology, Hohhot 010051, China;
4. Inner Mongolia Engineering Research Center of Ecological Building Materials and Prefabricated Construction, Hohhot 010051, China

摘要

摘要: 为了探究常年冻土区混凝土孔隙结冰规律对抗压强度的影响，使用自制低温压力机测试混凝土抗压强度，并借助核磁共振仪测试混凝土中不同孔径的孔隙结冰规律。基于灰色理论分析了孔隙结冰量对抗压强度的影响规律，并建立了孔隙结冰量与抗压强度的关系模型。结果表明：0~-10℃时，混凝土毛细孔和过渡孔由于孔径较大，快速结冰，使得此温度区间内结冰量和抗压强度迅速增长。过渡孔是混凝土的主要孔隙，-10℃时99.7%的毛细孔和55.8%的过渡孔已经结冰，此时凝胶孔占比增大且不易结冰，结冰量和抗压强度增长缓慢。混凝土过渡孔结冰量对抗压强度影响最为显著，其灰熵关联度为0.985 0，基于GM （0，2）模型的混凝土抗压强度计算值与试验值的平均相对误差为3.33%。
- 冻土区 /
- 混凝土 /
- 结冰规律 /
- 抗压强度
Abstract: In order to study the effect of freezing laws for concrete pores on compressive strength in permafrost regions, a self-made low-temperature compressive testing machine was used to gauge the concrete compressive strength. The laws of ice content in different size pores were measured by nuclear magnetic resonance apparatuses. Based on the grey theory, the effect of the ice content in pores on compressive strength was analyzed, and the relation model between ice content and compressive strength was constructed. The results showed that from 0℃ to -10℃, the capillary pores and transition pores freezed rapidly due to the larger pore sizes, so the ice content and compressive strength increased rapidly in the temperature range. Transition pores were the main pores of concrete. At -10℃, 99.7% of the capillary pores and 55.8% of the transition pores had been frozen. At the time, the proportion of gel pore increased and it was hard to be frozen, so the ice content and compressive strength increased slowly. The ice content of the transition pores was the most significant influence on compressive strength, and its correlation degree of grey entropy was 0.985 0. The calculated values of concrete compressive strength based on GM(0,2) Model had an average relative error of 3.33% from the test value.
- permafrost region /
- concrete /
- freezing law /
- compressive strength

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