低胶凝材料自密实混凝土的制备及性能研究  

Study on Preparation and Properties of Self-Compacting Concrete with Low Cementitious Materials

作　　者：虞冬冬 温金保[2,3,4] 祝烨然 夏强[2,3,4] 唐修生 杜志芹 刘兴荣[2,3,4] YU Dongdong;WEN Jinbao;ZHU Yeran;XIA Qiang;TANG Xiusheng;DU Zhiqin;LIU Xingrong(Changzhou Port and Waterway Development Center,Changzhou 213000,China;Nanjing Hydraulic Research Institute,Nanjing 210029,China;Nanjing R&D Hi-Tech Co.,Ltd.,Nanjing 210024,China;Research Center on New Materials in Hydraulic Structures of Ministry of Water Resources,Nanjing 210024,China)

机构地区：[1]常州市港航事业发展中心,江苏常州213000 [2]南京水利科学研究院,江苏南京210029 [3]南京瑞迪高新技术有限公司,江苏南京210024 [4]水利部水工新材料工程技术研究中心,江苏南京210024

出　　处：《混凝土与水泥制品》2023年第6期11-15,共5页China Concrete and Cement Products

基　　金：中央级公益性科研院所基本科研业务基金项目(Y420010)。

摘　　要：以自密实混凝土(SCC)的工作性及28 d抗压强度为评价指标,采用正交试验法进行了低胶凝材料SCC性能的因素极差分析与方差分析。结果表明:试验设计的水胶比、砂率、粉煤灰和矿粉掺量对低胶凝材料SCC的工作性及28 d抗压强度的影响均不显著,但水胶比与粉煤灰掺量的影响程度相对较大,且极差分析与方差分析结果基本一致。所制备的低胶凝材料SCC具有优异的工作性、力学性能及耐久性能,坍落扩展度经时损失仅为8.1%,初始坍落扩展度与J环扩展度差值为20 mm,离析率为4.9%,后期强度增长幅度大,抗水与抗氯离子渗透性能好。Taking the workability and 28 d compressive strength of self-compacting concrete(SCC)as the evaluation indexes,the factor range analysis and variance analysis of the performance of low cementitious material SCC were carried out by using orthogonal test method.The results show that the effects of water binder ratio,sand ratio,fly ash content and mineral powder content on the workability and 28 d compressive strength of low cementitious material SCC are not significant,but the effects of water binder ratio and fly ash content are relatively large,and the results of range analysis are basically consistent with those of variance analysis.The prepared low cementitious material SCC has excellent workability,mechanical properties and durability,the loss of slump expansion over time is only 8.1%,the difference between the initial slump expansion and the J-ring expansion is 20 mm,the segregation rate is 4.9%,the late strength growth is large,and the water resistance and chloride ion penetration resistance are good.

关 键 词：低胶凝材料 自密实混凝土 正交试验 方差分析 工作性 抗压强度 耐久性能 

分 类 号：TU528[建筑科学—建筑技术科学]