离心成型钢纤维混凝土弯曲拉伸性能试验研究  

Experiment of Flexural-Tensile Properties of Spun-Cast SFRC

作　　者：李凤兰[1] 张吉红[1] 赵顺波[1] 

机构地区：[1]华北水利水电学院工程材料与结构研究所,河南郑州450011

出　　处：《建筑材料学报》2008年第2期217-222,共6页Journal of Building Materials

基　　金：河南省自然科学基金资助项目(0511051700)

摘　　要：通过试验研究了离心工艺参数、骨料级配、钢纤维长度和体积分数等因素对离心成型钢纤维环形截面混凝土的弯曲拉伸强度、受拉应变和变形的影响规律．结果表明，当选用长度较小的钢纤维时，适当延长离心成型中速阶段的离心时间可提高钢纤维混凝土的弯曲拉伸强度和极限变形能力；当选用长度较大的钢纤维时，适当增大中速阶段的离心加速度可提高钢纤维混凝土的弯曲拉伸强度和极限变形能力；选取粗骨料级配为5～10，5～15mm时，钢纤维长度为25～32mm可获得较高的弯曲拉伸强度和极限变形能力，钢纤维体积分数宜取1．2％左右，经统计分析提出了离心成型钢纤维混凝土的弯曲拉伸强度计算公式．A series of experiments were conducted to study the flexural-tensile properties of spun-cast steel fiber reinforced concrete(SFRC) members of circular section subjected to side compression,in which the effects of coefficients of centrifugation,the size grades of coarse aggregate,the length and volume fraction of steel fiber were investigated.It is proved that the flexural-tensile strength and the ultimate deformation can be enhanced by properly extending the spun-cast time of middle speed stage when the length of steel fiber is shorter,they also can be enhanced by properly increasing centrifugation acceleration of middle speed stage when the length of steel fiber is longer.The higher flexural-tensile strength and the higher ultimate deformation can be obtained by selecting the size grade 5～10 mm and 5～15 mm of coarse aggregate and the length of steel fiber in range of 25～32 mm.The volume fraction of steel fiber of about 1.2% is better.The formula is proposed for calculating the flexural-tensile strength of spun-cast SFRC by statistical analysis of the test data.

关 键 词：钢纤维混凝土 离心成型 弯曲拉伸强度 粗骨料级配 钢纤维长度 

分 类 号：TU528.572[建筑科学—建筑技术科学]