辅助振捣对自密实重晶石混凝土离析的影响  

Effect of Auxiliary Vibration on Segregation of Self-Compacting Barite Concrete

作　　者：石建军 李竹静 张志恒 杨晓峰 颜维 许新春 禹博 SHI Jian-jun;LI Zhu-jing;ZHANG Zhi-heng;YANG Xiao-feng;YAN Wei;XU Xin-chun;YU Bo(School of Civil Engineering,University of South China,Hengyang 421001,China)

机构地区：[1]南华大学土木工程学院,湖南衡阳421001

出　　处：《混凝土与水泥制品》2023年第4期9-13,共5页China Concrete and Cement Products

基　　金：湖南省科技厅重点研发计划项目(2015JC3090);湖南省自然科学基金资助项目(14JJ2083)。

摘　　要：为了研究辅助振捣对自密实重晶石混凝土离析的影响,以振捣棒电压(70 V、85 V、100 V)、振捣时间(6 s、8 s、10 s)及插入深度(100 mm、200 mm、300 mm)三个因素设计了正交试验。在内径和深度均为300 mm的检测筒内进行分层离析试验,试验采用两种辅助振捣方式(第一种插拔静止状态下的振捣棒、第二种插拔振动状态下的振捣棒),并对结果进行了评价与分析。结果表明:采用第一种振捣方式时,电压70 V、振捣时间6 s、插入深度200 mm为最优振捣参数,自密实重晶石混凝土的离析最小;不同粒径粗骨料的离析有明显区别,粗骨料粒径越大,离析越大;采用相同振捣参数,第二种振捣方式比第一种振捣方式下的自密实重晶石混凝土离析更大。In order to study the effect of auxiliary vibration on segregation of self-compacting barite concrete,the orthogonal experiment was designed from three factors of poker vibrator voltages(70 V,85 V,100 V),vibration time(6 s,8 s,10 s)and vibration depths(100 mm,200 mm,300 mm).The segregation test was carried out in three layers of mold with inner diameter and depth of 300 mm,and the results were analyzed and evaluated.Two methods of auxiliary vibration(the first method is keeping poker vibrator in static state when it is inserted and pulled and the second is in vibrating state)were adopted in the test.The results show that the optimal vibration parameters are voltage of 70 V,vibration time of 6 s and insertion depth of 200 mm when the first vibration method is adopted,and the segregation of self-compacting barite concrete is the smallest.The separation of coarse aggregates with different particle sizes has an apparent difference,and the larger the particle size of the aggregate,the greater the segregation.With the same vibration parameters,the segregation of self-compacting barite concrete in the second vibration method is greater than that in the first vibration method.

关 键 词：自密实重晶石混凝土 辅助振捣 离析率 振捣参数 

分 类 号：TU528.35[建筑科学—建筑技术科学]