|Table of Contents|

Experimental study and numerical analysis on performance changes of high-temperature concrete under different cooling conditions(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2025年05期
Page:
125-134
Research Field:
建筑材料
Publishing date:

Info

Title:
Experimental study and numerical analysis on performance changes of high-temperature concrete under different cooling conditions
Author(s):
LIU Jialiang1;  MIAO Jijun1;  WANG Shengxu1;  LIU Yanchun1;  LIU Caiwei1;  XIN Luchao2
(1. School of Civil Engineering, Qingdao University of Technology, Qingdao 266520, Shandong, China; 2. Linyi Urban Construction Group Co., Ltd, Linyi 276002, Shandong, China)
Keywords:
concrete;  cooling method;  compressive strength;  temperature difference;  numerical analysis
PACS:
TU528
DOI:
10.19815/j.jace.2024.01002
Abstract:
In order to study the heat transfer law and mechanical performance changes of high-temperature concrete during the cooling process, 40 sets of 120 standard concrete cube specimens(150 mm×150 mm×150 mm)were designed. The concrete was subjected to heating tests, cooling tests, and compressive strength tests with variables such as fire temperature, cooling method, and water spray cooling time. Based on the experimental results, a corresponding temperature numerical model was proposed to study the heat transfer law of high-temperature concrete during different cooling methods. The results show that the cooling rate of high-temperature concrete water cooling is significantly faster than natural cooling. 100 ℃ can be used as the boundary point for the concrete water cooling process. When the temperature drops to 100 ℃, the cooling rate of immersion cooling and spray cooling slows down significantly. In the early stage of water spray cooling, the “thermal shock” caused by water spray will result in a huge temperature difference between the inside and outside of the concrete, causing significant loss of mechanical properties. As the experiment progresses, the temperature difference of concrete slowly disappears. Therefore, in the later stage of cooling, the compressive strength gradually recovers. After iterative optimization of the boundary conditions and thermal parameters of concrete during the cooling process, the calculated values of the proposed ABAQUS finite element model has a good agreement with the experimental values, providing theoretical reference for the heat transfer of high-temperature concrete water cooling.

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Last Update: 2025-09-25