摘要:基于RapidAir 和 MAP-BEI测试技术,对比研究了分别以玄武岩、砂岩和灰岩为人工骨料的
卡期注:+ 部乳及累耕征,结果 表 明:定时,友爱混凝土气泡数·丶/发多,同距系
數和平均孔径最小;砂岩混凝土气泡数量最少,间距系数和平均孔径最大,工程中应予以足够重
视,界面Ca(OH)2的富集程度受骨料化学属性及物理性能(如长期吸水率)影响.上述3种骨料-浆
休界面Ca(OH):的富集程度为砂岩>玄武岩>灰岩,界面过渡区厚度为砂岩>灰岩>玄武岩,砂
岩界面性能最薄弱。
关键词:骨料种类;大坝混凝土;孔结构,界面过渡区
中图分类号:TU528.2
文献标志码:A
doi:10.3969/j.issn.1007-9629.2015.01.024
Influence of Aggregate Variety on Pore Structure and
Microscopic Interface of Concrete
SHI Yan,YANG Huaquan, CHEN Xia , LI Xiang,ZHOU Shihua
(Collaborative Innovation Center for Geo-Hazards and Eco-Environment in the Three Gorges Area,
Changjiang River Scientific Research Institate,Wuhan 430010,China)
Abstract:Based on the test technique of RapidAir and MAP-BEI, pore structure and microscopic interface
of dam concrete with different aggregates were studied. The results show that with the definite mix pro-
portion, the limestone concrete has the maximum amount of bubbles and the minimum space coefficient
and average pore size, while the sandstone concrete leads to the opposite results, which should be paid e-
nough attention. The enrichment of Ca(OH) in the interfacial transition zone(ITZ) is affected by chemi
cal and physical properties of aggregates(such as long-term water absorption). The degree of Ca(OH): en-
richment and interface thickness are increased in the order of sandstone > basalt >limestone and sandstone
>limestone> basalt. Sandstone concrete has the weakest interface structure.
Key words:aggregate variety : dam concrete;pore structure;interfacial transition zone(ITZ)
骨料在大坝混凝土中用量比例高(约占混凝土
核生长,从而影响界面过渡区的微观结构,导致界面
材料总质量的 90%),最大粒径大(可达 150 mm),
过渡区力学性能存在差异.同时,骨料类型也会影响
骨料特性对大坝混凝土性能的影响尤其显著,甚至
水泥浆体的孔隙结构,这与骨料形状、表面结构及长
起着决定性的作用[1.硬化混凝土由骨料、界面过渡
期吸水率等性能有关.在满足新拌混凝土含气量要
区和水泥浆体3部分组成,其中水泥浆体气孔结构
求的同时,部分国家已将硬化混凝土的气泡参数指
及界面微观特征对混凝土宏观性能的影响不容忽
标(含气量、气泡间距系数和气泡平均直径等)列人
视.研究表明[3],骨料的矿物组成和表面结构会影
了规范[1,以确保混凝土的抗冻性.但是,目前关于
响水化产物特别是Ca(OH),和钙矾石(AFt)的成
骨料种类影响大坝混凝土内部孔结构及微观界面特
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