利用玻璃渣替代安山岩骨料制备耐热混凝土的试验研究  

Experimental study on the properties of heat resistant concrete prepared by replacing part of andesite aggregate with recycled cullet

作　　者：鲁杰[1] 李瑞欣[1] 关鹏[2] 薛志佳 LU Jie;LI Ruixin;GUAN Peng;XUE Zhijia(The Fourth Geological Exploration Institute,Henan Geology and Mineral Exploration Bureau,Zhengzhou 450000,China;China University of Geoscience,Wuhan 430074,China;Highway College,Chang′an University,Xi′an 710064,China)

机构地区：[1]河南省地质矿产勘查开发局第四地质勘查院,河南郑州450000 [2]中国地质大学(武汉)工程学院,湖北武汉430074 [3]长安大学公路学院,陕西西安710064

出　　处：《混凝土》2024年第8期95-101,共7页Concrete

基　　金：国家自然科学基金青年基金(41902280);陕西省高校科协青年人才托举计划项目(20210422)。

摘　　要：采用普通硅酸盐水泥、安山岩粗细骨料、粉煤灰、玻璃渣制备了耐热混凝土,研究了不同掺量玻璃渣替代部分粗骨料(0、5%、10%)对耐热混凝土在不同温度热处理(常温25℃,110℃烘干,300℃、500℃、700℃、900℃煅烧)前后对混凝土的尺寸、质量、抗压强度、热导率的影响,评价了混凝土的耐热性能,并分析了混凝土在高温热处理过程中的耐热损伤机理。研究结果表明:随温度从25℃升高至900℃,混凝土逐渐脱水脱碳而失重,密度逐渐降低,热导率也相应减小。混凝土的质量和密度可以用来评价混凝土的导热率。随热处理温度的升高,混凝土先收缩后膨胀,抗压强度则随温度的升高而先增加后减少,在300℃时达到最大值,此时混凝土的收缩变形也最小。玻璃渣取代粗骨料比例越高,混凝土变形越大,失质量越大,导热率越小,混凝土抗压强度越低,但整体差异不大。验证了采用玻璃渣取代部分骨料制备耐热混凝土的可行性。Ordinary Portland cement.Andesite coarse and fine aggregates,fly ash,and recycled cullet are used to prepare heat resistant concrete.The effects of recycled cullet with different contents replacing part of coarse aggregates(0,5%,10%)on the size,quality,compressive strength,and thermal conductivity of heat resistant concrete before and after heat treatment at different temperatures(25℃,110℃,300℃,500℃,700℃,900℃)are studied.The heat resistance of concrete is evaluated,and the heat damage mechanism of concrete during high temperature heat treatment is analyzed.The results show that with the temperature rising from 25℃to 900℃,the concrete gradually loses weight due to dehydration and decarburization,and the density and thermal conductivity decrease accordingly.The quality and density of concrete can be used to evaluate the thermal conductivity of concrete.With the increase of heat treatment temperature,the concrete first shrinks and then expands,and the compressive strength first increases and then decreases with the increase of temperature,reaching the maximum value at 300℃,at which time the shrinkage deformation of concrete is minimum.The higher the proportion of recycled cullet replacing coarse aggregate,the greater the concrete deformation,the greater the weight loss,the smaller the thermal conductivity,and the lower the compressive strength of concrete,but the overall difference is small.The feasibility of using glass slag to replace part of aggregate to prepare heat-resistant concrete is verified.

关 键 词：安山岩 玻璃渣 耐热混凝土 耐热机理 失重 

分 类 号：TU528.041[建筑科学—建筑技术科学]