骨料碱活性矿物组成和含量对碱-硅酸反应的影响  

Effect of composition and content of alkali-active mineral in aggregate on alkali-silica reaction

作　　者：王浩伟 何忠茂 巴恒静[3] WANG Haowei;HE Zhongmao;BA Hengjing(School of Civil and Environmental Engineering and Geography Science,Ningbo University,Ningbo 315300,China;College Science and Technology,Ningbo University,Ningbo 315300,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]宁波大学土木工程与地理环境学院,浙江宁波315300 [2]宁波大学科学与技术学院,浙江宁波315300 [3]哈尔滨工业大学土木工程学院,黑龙江哈尔滨150001

出　　处：《混凝土》2024年第7期138-140,148,共4页Concrete

摘　　要：采用岩相法确定某东南沿海地区常用骨料具有碱活性,岩石类型为蚀变岩和安山岩,活性矿物主要为硅质蛋白石、玉髓、隐晶玻璃和绿帘石。蚀变岩碱活性矿物含量远高于安山岩,骨料以蚀变岩为主的试块快速砂浆棒法膨胀率大于以安山岩为主的试块。通过SEM和EDS对快速砂浆棒法试样自然断面进行形貌观察和元素含量分析,结果表明:蚀变岩碱活性矿物以铝硅酸盐为主,蚀变过程中Al^(3+)部分取代Si^(4+),Na^(+)吸附能力增强,碱活性增加。Petrographic method is used in this experiment to determine a kind of commonly used aggregate alkali activity in Southeast coastal area,the aggregate is composed of altered rock and andesite,and the main mineral composition is silica opal,chalcedony cryptocrystalline glass and epidote.The alkali active mineral content of altered rock is much higher than that of andesite,the expansion rate of altered rock in rapid mortar bar test is greater than that of andesite.SEM and EDS are applied to observe the micro-appearance and analyze the elemental content,and the results indicate that the alkali-active mineral of altered rock is mainly composed of aluminosilicate,Al^(3+)partly replace Si^(4+)when rocks alter,this process increase the adsorption capacity of Na^(+),and the alkali activity of altered rocks.

关 键 词：岩相分析 碱-硅酸反应 Na^(+)吸附 碱活性矿物 

分 类 号：TU528.041[建筑科学—建筑技术科学]