清水自密实混凝土清水效果表征与研究  

Characterization and Research on the Apparent Effect of Fair-faced Self-compacting Concrete

作　　者：孟亚锋[1] 张宇星 沈卫国[2,3] 谢兼量 杨文亚[1] 唐祥春[1] MENG Ya-feng;ZHANG Yu-xing;SHEN Wei-guo;XIE Jian-liang;YANG Wen-ya;TANG Xiang-chun(Guangdong Provincial Changda Highway Engineering Co.,Ltd.,Guangzhou 510000,China;School of Material Science and Engineering,Wuhan University of Technology,Wuhan 430070,China;State Key Laboratory of Silicate Materials for Architecture,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]广东省长大公路工程有限公司,广州510000 [2]武汉理工大学材料科学与工程学院,武汉430070 [3]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070

出　　处：《硅酸盐通报》2019年第8期2683-2687,共5页Bulletin of the Chinese Ceramic Society

基　　金：广东交通运输厅科技项目(2012-03-006,2016-02-007)

摘　　要：自主设计了用于表征自密实性混凝土清水效果的试件成型模具。制定了系统化的清水效果表征方法,使表征结果完全量化,实现了关于混凝土配合比对清水效果影响规律的系统化实验研究。结果表明,粗集料体积率达0.35时混凝土具有最佳清水效果。砂体积率过低易形成小气泡,砂体积率过高时易产生大气泡,最佳砂体积率为0.44。矿物掺合料在一定掺量范围内可减少气泡数量,但掺量过高时会导致粘度提高,不利于气泡排出。矿渣微粉较粉煤灰具有更强的颜色提亮效果,最佳矿渣微粉掺量为25%,最佳粉煤灰掺量为20%。The apparent effect specimen molds for fair-faced of the self-compacting concrete had been designed independently.A systematic apparent effect characterization method had been designed to quantify the results and achieved systematic experimental research on the influence of mixing proportion to apparent effect.The results indicate that concrete shows the best apparent effect with a 0.35 coarse aggregate volume ratio.The optimum sand volume ratio is 0.44,while a too low sand volume ratio leads to small pores and a too high sand volume ratio leads to big pores.The brighten effect of ground granulated blast furnace slag(GGBS)is higher than that of fly ash.Within a certain dosage range,mineral admixture could reduce the number of pores but adverse to discharge the bubbles in concrete with a too high dosage.The optimum GGBS dosage is 25%and the optimum fly ash dosage is 20%.

关 键 词：清水混凝土 自密实 清水效果 表征方法 影响规律 

分 类 号：TU528.53[建筑科学—建筑技术科学]