高温后高强轻骨料混凝土力学性能试验研究  

Experimental Study on Mechanical Properties of High Strength Light Aggregate Concrete after High Temperature

作　　者：刘宏波 魏鲁彬 叶晓旭 汪凯柄 杨奥齐 LIU Hongbo;WEI Lubin;YE Xiaoxu;WANG Kaibing;YANG Aoqi(Hebei Institute of Civil Engineering,Zhangjiakou Hebei 075000,China;Key Laboratory of Civil Engineering Diagnosis,Transformation and Disaster Resistance,Zhangjiakou Hebei 075000,China)

机构地区：[1]河北建筑工程学院土木工程学院,河北张家口075000 [2]河北省土木工程诊断、改造与抗灾重点试验室,河北张家口075000

出　　处：《长春工程学院学报(自然科学版)》2025年第1期19-24,共6页Journal of Changchun Institute of Technology:Natural Sciences Edition

基　　金：河北省高校2022年基本科研业务费项目(2022CXTD01);河北建筑工程学院博士基金项目(B-202103);2024年度校级研究生创新基金项目(XY2024007)。

摘　　要：为研究高强轻骨料混凝土高温后的力学性能,制备了强度等级为LC50、LC60和LC70的高强轻骨料混凝土,并研究了LC50、LC70轻骨料混凝土在高温后的轴压性能。用快速升温箱式电炉对LC50、LC70轻骨料混凝土进行200℃、400℃、600℃和800℃的加热,并对各温度后的高强混凝土进行单轴抗压力学性能试验。观察高温后高强轻骨料混凝土的表观特征,测试其立方体抗压强度,分析高温对其力学性能的影响。结果表明:高强轻骨料混凝土立方体试块的抗压强度随温度的升高总体呈下降趋势,并具有一定规律性。当温度由常温加热到800℃时,高强轻骨料混凝土轴心抗压强度下降量<50%,在600℃时降幅较大。In order to study the mechanical properties of high strength light aggregate concrete after high temperature,high strength light aggregate concrete with strength grades of LC50,LC60 and LC70 are prepared,and the axial compression performance of LC50 and LC70 light aggregate concrete after high temperature is studied.Heating LC50 and LC70 light aggregate concrete at 200℃,400℃,600℃,and 800℃by a rapid heating box type electric furnace,the high strength concrete after each temperature is conducted to test uniaxial compressive performance.It observes the apparent characteristics of high strength light aggregate concrete after high temperature,tests the cubic compressive strength,and analyzes the influence of high temperature on the mechanical properties.The results show that the compressive strength of cubic specimens of high strength light aggregate concrete generally decreases with increasing of temperature and has a certain regularity.When the temperature is heated from normal temperature to 800℃,the axial compressive strength of high strength light aggregate concrete decreases by less than 50%,and the decrease is greater at 600℃.

关 键 词：高温 高强轻骨料混凝土 轴压性能 

分 类 号：TU528.2[建筑科学—建筑技术科学]