骨料级配及砂浆富余系数对防辐射混凝土性能的影响
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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.
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.
引文
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[2]李政统,黄红俊.重晶石防辐射混凝土的制备与泵送施工[J].混凝土与水泥制品,2017(9):82-84.
[3]Kinno M,Kimura K,Nakamura T.Raw materials for lowactivation concrete neutron shields[J].Journal of nuclear science and technology,2002,39(12):1275-1280.
[4]Amritphale S S,Anshul A,Chandra N,et al.A novel process for making radiopaque materials using bauxite-Red mud[J].Journal of the European Ceramic Society,2007,27(4):1945-1951.
[5]伍崇明,丁德馨,张辉赤.屏蔽混凝土配合比设计方法研究[J].核动力工程,2007,28(5):124-127.
[6]Fillmore D L,Winston P L,Morton S L,et al.The long-term performance of concrete in nuclear applications[C].ASME 2005Pressure Vessels and Piping Conference.American Society of Mechanical Engineers,2005:639-648.
[7]潘智生,赵晖,寇世聪.防辐射混凝土研究现状、存在问题及发展趋势[J].武汉理工大学学报,2011(1):45-51.
[8]李国刚.防辐射高性能混凝土材料研究[D].武汉:武汉理工大学,2010.
[9]陈清己.重晶石防辐射混凝土配合比设计及其性能研究[D].长沙:中南大学,2010.
[10]杨帆.防辐射混凝土应用与施工技术研究[D].天津:河北工业大学,2015.
[11]Hüsken G,Brouwers H J H.A new mix design concept for earth-moist concret:A theoretical and experimental study[J].Cement and Concrete Research,2008,38(10):1246-1259.
[12]吴中伟.高性能混凝土-绿色混凝土[J].混凝土与水泥制品,2000(1):3-6.