硅粉对低热硅酸盐水泥混凝土基本力学性能的影响  

Influence of Silica Fume Content on the Basic Mechanical Properties of Low-Heat Portland Cement Concrete

作　　者：郭建强 GUO Jianqiang(The 5th Engineering Co.,Ltd.,China Railway Construction Bridge Engineering Bureau Group,Chengdu 610500,China)

机构地区：[1]中铁建大桥工程局集团第五工程有限公司,成都610500

出　　处：《工业建筑》2024年第4期195-199,共5页Industrial Construction

基　　金：国家自然科学基金项目(51808351)。

摘　　要：随着低热硅酸盐水泥在水利工程中的广泛应用,对低热硅酸盐水泥混凝土的力学性能提出了更高的要求。采用水下钢球法量化硅粉掺量(0、3%和5%)对低热硅酸盐水泥混凝土基本力学性能和其他力学性能的影响进行研究。结果表明:掺入硅粉可有效提高低热硅酸盐水泥混凝土的抗冲磨性能,当掺量由0增大至3%和5%时,抗冲磨性能分别提高了12.2%和14.6%;相比于不掺入硅粉的混凝土,当掺入3%硅粉时,低热硅酸盐水泥混凝土的抗压强度和劈裂抗拉强度分别降低约3.5%~6.0%、3.8%~11.1%;轴向拉伸性能(轴向拉伸强度和极限拉伸值)提高约7.0%;当掺入5%硅粉时,低热硅酸盐水泥混凝土的抗压强度、劈裂抗拉强度和轴向拉伸性能分别提高约3.6%~7.0%、2.8%~3.5%、6.9%~14.8%。可见,硅粉掺量为5%的低热硅酸盐水泥混凝土具有相对理想的力学性能。With the wide application of low-heat Portland cement in hydraulic projects,higher requirements are put forward for the mechanical properties of low-heat Portland cement concrete.In this study,the underwater steel ball method was used to quantify the influence of silica fume content(0,3%and 5%)on the basic mechanical properties and other mechanical properties of low-heat Portland cement concrete.The results showed that the addition of silica fume could effectively improve the abrasion resistance of low-heat Portland cement concrete,which increased by 12.2%when the content was 3%,and increased by 14.6%when the content was 5%.Compared to concrete without adding silicon powder,when 3%silica fume was added,the compressive strength and split tensile strength of low-heat Portland concrete were respectively reduced by about 3.5%-6.0%,3.8%-11.1%;axial tensile properties(axial tensile strength and ultimate tensile value)increased by about 7.0%;when 5%silica fume was added,the compressive strength,splitting tensile strength and axial tensile properties could be respectively increased by about 3.6%-7.0%,2.8%-3.5%,6.9%-14.8%.Therefore,a relatively ideal overall performance could be obtained when the content of silica fume was 5%.

关 键 词：硅粉 低热硅酸盐水泥 抗冲磨性能 力学性能 

分 类 号：TV431[水利工程—水工结构工程]