高温后陶粒混凝土性能试验研究  

EXPERIMENT AND ANALYSIS OF CERAMSITE LIGHTWEIGHT AGGREGATE CONCRETE AFTER ELEVATED TEMPERATURE

作　　者：蒋文婷[1] 王建民[1] 程博[1] 

机构地区：[1]宁波大学建筑工程与环境学院,浙江宁波315211

出　　处：《工业建筑》2014年第2期103-107,共5页Industrial Construction

基　　金：浙江省自然科学基金项目(Y1100197);宁波市自然科学基金资助项目(2013A610193)

摘　　要：分常温,200,350,500,650,800℃六个温度水平,对陶粒轻骨料混凝土分批进行高温加热。待自然冷却后,观察试块经不同温度水平加热后的颜色变化、裂缝发展等表观特征,分析质量变化、抗压强度和抗拉强度随加热温度的变化规律,并通过扫描电子显微镜对高温后陶粒混凝土的微观结构特征进行观测分析。试验结果表明:陶粒混凝土的外观颜色、表面裂纹及微观特征随温度的升高发生一定规律的变化;与普通混凝土相比,陶粒混凝土的抗压和抗拉强度随着加热温度的升高,其下降变化趋势较为平稳缓慢,且残余抗压与抗拉强度比明显大于普通混凝土的。研究表明,经过缓慢升温与自然冷却后,陶粒混凝土具有良好的抗火性能。Experiment on the performance of ceramsite lightweight aggregate concrete （LWAC） after elevated temperature was conducted and six temperature levels, room temperature, 200 ℃ , 350 ℃ , 500 ℃ , 650 ℃ and 800 ℃were selected to heat the LWAC test blocks. The appearance features of color, crack development and changes on quality were observed after elevated temperature, and the micro-characteristics were analyzed by utilizing the scanning electron microscopy （SEM）. The experiment results indicate that, the variation of compressive and tensile strengths of LWAC with the elevated temperature are smoother and slower than those of normal concrete （ NC）. The residual compressive and tensile strength ratios are obviously larger than those of NC. It provides basic experimental study on the fire resistance of LWAC. If the spalling problem could be well solved at high temperature, the ceramsite LWAC will have potentially better fire resistance than that of NC.

关 键 词：轻骨料混凝土 高温 力学性能 微观特征 

分 类 号：TU528[建筑科学—建筑技术科学]