公路预制桥梁人工砂混凝土性能影响因素试验研究  

Experimental Study on Influencing Factors of Artificial Sand Concrete Performance of Highway Precast Bridge

作　　者：胡文 HU Wen(Guangdong Nanyue Traffic Xiongxin Expressway Management Office,Shaoguan,Guangdong512499,China)

机构地区：[1]广东省南粤交通雄信高速公路管理处,广东韶关512499

出　　处：《施工技术（中英文）》2024年第22期49-54,共6页Construction Technology

摘　　要：为解决公路预制桥梁(T形梁)浇筑混凝土和易性不足、脱模后光滑度不够等问题,开展新型预制桥梁人工砂混凝土试验研究,探讨人工砂取代率、减水剂掺量、矿物掺合料复合掺量对混凝土流动性能、力学性能的影响。结果表明:人工砂取代河砂应用到混凝土中,综合性能未降低,人工砂取代率100%具有可行性;减水剂因其静电斥力与空间位阻效应对混凝土流动性能产生较大影响,确定最优减水剂掺量为0.39kg/m^(3);适量矿物掺合料粉煤灰、矿粉替代水泥,对混凝土流动性能、力学性能均有有利影响,最佳掺量质量比为m_(水泥)∶m_(粉煤灰)∶m_(矿粉)=455∶60∶35;最优配合比性能测试中人工砂混凝土综合性能更优,进一步表明人工砂替代河砂在大批量混凝土生产中的可行性。In order to solve the problems of insufficient workability and insufficient smoothness after demoulding of concrete for highway precast bridge(T-beam),the experimental study on artificial sand concrete of new precast bridge was carried out,and the effects of replacement rate of artificial sand,dosage of water reducing agent and compound dosage of mineral admixture on the fluidity and mechanical properties of concrete were discussed.The results show that the comprehensive performance of concrete is not reduced when artificial sand is used to replace river sand,and it is feasible to replace 100%of artificial sand.The superplasticizer has a great influence on the fluidity of concrete due to its electrostatic repulsion and steric hindrance effect,and the optimal dosage of superplasticizer is determined to be 039kg/m^(3).The proper amount of mineral admixture fly ash and slag powder instead of cement has a beneficial effect on the flow performance and mechanical properties of concrete.The optimum dosage mass ratio is:m_(水泥)∶m_(粉煤灰)∶m_(矿粉)=455∶60∶35.The optimal mix ratio performance test shows that the comprehensive performance of artificial sand concrete is better,which further indicates the feasibility of artificial sand replacing river sand in mass concrete production.

关 键 词：预制桥梁 混凝土 人工砂 减水剂 矿物掺合料 流动性能 力学性能 

分 类 号：TU528[建筑科学—建筑技术科学]