不同钢纤维对再生混凝土基本力学性能的影响  

The impact of different steel fibers on the basic mechanical properties of recycled concrete

作　　者：杨粉[1] 陈爱玖[1] 王静[1] 

机构地区：[1]华北水利水电学院,河南郑州450011

出　　处：《新型建筑材料》2013年第2期44-46,共3页New Building Materials

基　　金：国家自然科学基金项目(50779018);河南省科技厅科技攻关资助(102102210096);郑州市科技攻关资助(112PPTGY222-3;10PTGS507-3);河南省杰出人才(094200510011);郑州市科技领军人才项目(096SYJH23105)

摘　　要：以普通混凝土的配合比设计原则为基础，研究了再生粗骨料取代率为40％时，C20、C25、C30、C35共4种强度等级下，铣削型、剪切型钢纤维对再生混凝土基本力学性能的影响及变化规律。试验结果表明，加入钢纤维后的再生混凝土立方体抗压强度较基体混凝土提高约1．3％-11．5％，抗折强度提高约2．1％～15．1％，抗压弹性模量提高约0．3％-10．4％，劈裂抗拉强度提高约7．1％～26．O％，轴心抗压强度提高约1．0％-13．4％；剪切型钢纤维对新拌混凝土的坍落度及28d龄期时基体力学性能的影响程度大于铣削型纤维。Based with the ordinary concrete design principles,the influence of milled and shear type steel fibers on the me- chanical properties of the recycled concrete and the change law were studied when the replacement rate of recycled coarse aggre- gate is 40%,and under four kinds of strength grades as C20,C25,C30 and C35. The experimental results show that after the ad- dition of fiber,the cube compressive strength of the recycled concrete improved about 1.3%-11.5% than the substrate concrete,the flexural strength increased about 2.1%-15.1% , the increase of the compressive elastic modulus was about 0.3%-10.4% , and the splitting tensile strength increased about 7.1%-26.0%;the axial compressive strength increased about 1.0%-13.4%.The influence degree of the slump of fresh concrete and the based basic mechanical properties of 28 days by the shear type steel fiber is greater than that by the milled type steel fiber.

关 键 词：配合比 钢纤维 再生混凝土 强度 

分 类 号：TU528.572[建筑科学—建筑技术科学]