掺高活性稻壳灰混凝土的抗冻融特性(英文)  

FREEZING AND THAWING RESISTANCE OF CONCRETE INCORPORATING HIGHLY ACTIVE RICE HUSK ASH

作　　者：冯庆革[1,2] 杨义[1] 童张法[1] YAMAMICHI H SUGITA S 

机构地区：[1]广西大学化学化工学院,南宁530004 [2]日本八户工业大学,八户市031-8501

出　　处：《硅酸盐学报》2008年第A01期136-139,共4页Journal of The Chinese Ceramic Society

基　　金：教育部科学技术研究重点(206111);教育部留学回国基金;广西科学基金(桂科青0640010)资助项目。

摘　　要：通过控制煅烧温度,合成了高活性的稻壳灰,采用快速冻融实验测定质量损失和相对动弹性模量,研究了在水胶比(以质量计)分别为0.45,0.55和0.65的掺高活性稻壳灰混凝土的抗冻融特性,分析了气泡及空气量对高活性稻壳灰混凝土的抗冻融特性的影响。研究表明:(1)对不同的水胶比,掺10%和20%高活性稻壳灰混凝土都具有良好的抗冻融特性,但是掺30%稻壳灰的混凝土的抗冻融特性下降;(2)混凝土含气量和平均气泡间隔系数极大的影响稻壳灰混凝土的抗冻融特性,硬化后含气量为4.5%和平均气泡间隔系数为400μm以下的稻壳灰混凝土都具有良好的抗冻融特性;(3)从混凝土的抗冻性角度来看,高活性稻壳灰在混凝土中的掺量上限为20%。Rice husk ash （RHA） with highly pozzolanic activity was obtained by controlling the calcination temperature. The relative dynamic modulus of elasticity and mass loss of concrete were measured by the rapid freezing-thawing test. The freezing and thawing resistance of concrete mixture was investigated with the addition of such highly active RHA at ratios of water to binder in mass of 0.45, 0.55, and 0.65, and the bubble structure in RHA concrete as well was determined. The results show： （1） concretes with 10% and 20% RHA have higher resistance to freezing and thawing; however, concrete containing 30% RHA have lower resistance to freezing and thawing. （2）The average spacing factor of bubbles and the air content will importanyly effect the freezing and thawing resistance of concrete with RHA added, and the concrete with a spacing factor less than 400 μm and an air content above 4.5% have high resistance to freezing and thawing. （3） According to the freezing and thawing resistance of concrete, 20% is the maximum amount of RHA that should be added to concrete.

关 键 词：混凝土 稻壳灰 抗冻融特性 含气量 气泡间隔系数 

分 类 号：TU528[建筑科学—建筑技术科学] TQ172[化学工程—水泥工业]