摘要
为解决使用重骨料防辐射混凝土易分层离析的问题,采用重晶石和磁铁矿为粗骨料,制备了防辐射混凝土,并研究了骨料级配、砂浆富余系数对其工作性及抗压强度的影响。结果表明,以Dinger-Funk方程优化粗骨料级配后,粗骨料空隙率下降,用两种类型骨料制备的混凝土相对沉降系数减小,坍落度增大,28 d抗压强度提高;分别以砂浆富余系数1.4、1.6、1.8、2.0拌合混凝土,相对沉降系数随砂浆富余系数的增大呈先减小后增大的趋势,坍落度和28 d抗压强度呈先增大后减小的趋势,两种类型重骨料混凝土最优砂浆富余系数均为1.8。
In order to solve the severe segregation of irradiation resistant concrete due to using heavyweight aggregates,the effects of aggregate gradation and mortar surplus coefficient on the workability and compressive strength of barite concrete and magnetite concrete were studied.The Dinger-Funk equation was used to optimize the aggregate gradation.The results show that after the optimized grading,the voidage of the aggregate decreases,the relative settling coefficient of the concrete mixed with the two types of aggregates respectively decrease,the slump and 28 d compressive strength increase.The concrete was mixed with the mortar surplus coefficient of 1.4,1.6,1.8 and 2.0.The results show that the relative settling coefficient decreases first and then increases with the increase of the mortar surplus coefficient,the slump and 28 d compressive strength increase first and then decrease.The optimum mortar surplus coefficients of the two types of heavyweight aggregate concrete are all 1.8.
作者
王蒙
曹银
王玲
吴浩
WANG Meng;CAO Yin;WANG Ling;WU Hao
出处
《混凝土与水泥制品》
北大核心
2019年第6期1-4,共4页
China Concrete and Cement Products
基金
国家重点研发计划资助(2017YFB0309902-2)
关键词
防辐射混凝土
重骨料
相对沉降系数
骨料级配
砂浆富余系数
Radiation shielding concrete
Heavyweight aggregates
Relative settling coefficient
Aggregate gradation
Mortar surplus coefficient
