Assessment of mechanical performance and ice content of concrete at low temperature using impact-echo method

被引：7

作者：

Sang, Yuan ^{[1
,2
,3
]}

Pan, Yijie ^{[1
,2
,3
]}

Ying, Weichao ^{[1
]}

Yang, Yingzi ^{[1
,2
,3
]}

机构：

[1] Harbin Inst Technol, Sch Civil Engn, Harbin 150090, Peoples R China

[2] Harbin Inst Technol, Minist Educ, Key Lab Struct Dynam Behav & Control, Harbin 150090, Peoples R China

[3] Harbin Inst Technol, Key Lab Smart Prevent & Mitigat Civil Engn Disast, Minist Ind & Informat Technol, Harbin 150090, Peoples R China

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2022年 / 346卷

基金：

中国国家自然科学基金;

关键词：

Impact-echo method; Negative temperature; Wave velocity; Compressive strength; Ice content; CEMENT-BASED MATERIALS; NUMERICAL-SIMULATION; HARDENED CONCRETE; AGE; MICROSTRUCTURE; SATURATION; MODULUS; MORTAR; PASTE; RESISTIVITY;

D O I：

10.1016/j.conbuildmat.2022.128286

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Ice formation and its volume expansion are important causes of concrete damage in winter construction. This paper presented a non-destructive method to evaluate the strength and ice content of concrete in winter using the impact-echo method. The longitudinal wave velocity obtained by the impact-echo method was the main monitoring indicator. Firstly, the variation of wave velocity and strength of concrete under positive temperature curing and freezing conditions was studied. The influences of pre-curing time, water to cement ratio and exposure temperature on concrete were analyzed. The differences in the strength-wave velocity relationships between frozen and unfrozen concrete are revealed. Further, a quantitative method for evaluating on-site concrete strength in winter by the impact-echo method was established. Secondly, a semi-empirical approach was proposed for calculating ice content based on wave velocity. This model provides a non-destructive way to study the freezing behavior of concrete, which is helpful for further understanding the freezing damage mechanism of concrete in the field.

引用

页数：17

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