胶凝砂砾石材料抗压强度影响因素研究  

Study on the Influence Factors of Compressive Strength of CSG Material

作　　者：柴启辉[1,2] 杨世锋[1,2] 孙明权[1,2] 

机构地区：[1]华北水利水电大学,河南郑州450045 [2]水资源高效利用与保障工程河南省协同创新中心,河南郑州450045

出　　处：《人民黄河》2016年第7期86-88,共3页Yellow River

基　　金：水利部公益性行业科研专项(201301025)

摘　　要：胶凝砂砾石材料作为一种新型的筑坝材料,力学特性受水泥用量、粉煤灰掺量、水胶比、砂率、骨料级配、龄期等因素的影响。通过大量不同配合比试验,研究胶凝砂砾石材料抗压强度随水胶比、砂率、水泥用量、粉煤灰掺量等因素变化的规律。砂率在工程常见范围0.1~0.4内时,胶凝砂砾石材料存在最优砂率,为0.2,对应最优水胶比为1.0~1.4;砂率高时最优水胶比取上限,反之取下限,最优砂率对应的最优水胶比为1.1左右。胶凝砂砾石材料中水泥用量每增加10kg/m^3,立方体试件28 d抗压强度可提高15%~20%;粉煤灰掺量每增加10 kg/m^3,立方体试件28 d抗压强度均有所增大,增大幅度为1%~10%。试件尺寸及骨料级配对材料抗压强度影响显著。As a new type of dam materials,the mechanical properties of CSG material are significantly affected by cement content,fly ashcontent,water binder ratio,sand ratio,aggregate gradation and age factors. In order to explore the influences of various factors on thecompressive strength of the material,through a lot of experiments,this paper studied the variation laws of compressive strength and watercement ratio,sand ratio,cement content,fly ash content and other factors. When the engineering common sand ratio is in the range of0.1-0.4,the optimal sand ratio is 0.2,corresponding to the optimal water binder ratio between 1.4 and 1.0. When the sand ratio is high,theupper bound of the optimal water binder ratio should be taken,and the lower value of the optimal water binder ratio is taken when the sandratio is low. When the optimal sand ratio is 20%,the optimal water binder ratio is about 1.1. In every cubic meter of CSG materials,cementcontent increases by 10 kg,the 28 d compressive strength of the cube can increase by 15%-20%. With the increase of fly ash content per 10 kg,the compressive strength of cubic 28 d is increased,and the increase range is between 10% and 1%. The effects of specimen size andaggregate gradation on the compressive strength of the material are significant.

关 键 词：胶凝砂砾石 抗压性能 影响因素 力学特性 

分 类 号：TV43[水利工程—水工结构工程]