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高溫后混凝土質量損失及抗壓強度退化規律試驗研究*
張白1,2,陳俊1,楊鷗3,蔣恩浩1,馬禹1
摘 要

(1 湘潭大學土木工程與力學學院, 湘潭 411105; 2 東南大學土木工程學院, 南京 211189;3 湖南大學土木工程學院,  長沙  410082)

[摘要]為研究混凝土高溫后質量損失及抗壓強度的退化規律,對高溫后混凝土立方體試件的質量損失和抗壓性能進行了測試,分析了溫度對混凝土的質量損失和抗壓強度的影響以及高溫后混凝土的受壓破壞特征。研究結果表明,隨著溫度的升高,混凝土的質量損失逐漸增大而抗壓強度整體呈下降趨勢,800℃的高溫作用后混凝土抗壓強度基本喪失,相比于常溫其損失程度高達85-4%;總體而言,混凝土抗壓強度隨溫度升高而減小的幅度與質量損失率隨溫度升高而增大的幅度基本一致。通過對試驗數據的擬合回歸分析,建立了混凝土抗壓強度與溫度、質量損失率與溫度及抗壓強度與質量損失率之間的計算公式,可利用所提出的公式通過混凝土質量損失或受火溫度來初步預估火災后混凝土結構的剩余抗壓強度。

[關鍵詞]混凝土; 高溫; 質量損失; 抗壓強度

中圖分類號:TU528-45文獻標識碼:A文章編號:1002-848X(2019)04-0076-06

 

Experimental study on mass loss and compressive strength degradation law of concrete after high temperature exposure

Zhang Bai1, 2, Chen Jun1, Yang Ou3, Jiang Enhao1, Ma Yu1

(1 College of Civil Engineering and Mechanics, Xiangtan University, Xiangtan 411105, China;2 School of Civil Engineering, Southeast University, Nanjing 211189, China;3 College of Civil Engineering, Hunan University, Changsha 410082, China)

Abstract:To investigate the mass loss and compressive strength degradation law of concrete after high temperature exposure, the mass loss and compressive properties of concrete cube specimen after temperature exposure was investigated. The effect of  temperature on mass loss and compressive strength of concrete and the compression failure characteristics after temperature exposure was analyzed. The research results show that the compressive strength of concrete decreases gradually and the mass loss of concrete increases gradually with the high temperature increases. After 800℃, the compressive strength of concrete is basically vanished, which is up to 85-4% loss compared to the normal temperature. In general, the decreasing extent in the compressive strength of concrete with increase of temperature are basically consistent to that of the growth in the mass loss rate of concrete with increase of temperature. Through fitting regression analysis of test data, the formulas were established for calculating the compressive strength of concrete with temperature, calculating mass loss rate and temperature, and calculating compressive strength and mass loss rate. The formulas could be used to predict the residual compressive strength of concrete after fire through mass loss and temperature.

Keywords:concrete; high temperature; mass loss; compressive strength

 

*國家自然科學基金資助項目(51578229)。

 

作者簡介:張白,博士研究生,Email:[email protected]

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