混杂钢纤维高强混凝土断裂特性研究  

Study of fracture properties of hybrid-steel fiber reinforced high-strength concrete

作　　者：高淑玲[1,2] 徐世烺[3] 袁全[1] 陈培[1] 

机构地区：[1]河北工业大学土木工程学院,天津300401 [2]河北省土木工程技术研究中心,天津300401 [3]浙江大学建筑工程学院,浙江杭州310058

出　　处：《大连理工大学学报》2011年第4期561-566,共6页Journal of Dalian University of Technology

基　　金："九七三"国家重点基础研究发展计划资助项目(2009CB623203);中国博士后科学基金资助项目(20100470046);国家自然科学基金资助项目(重点项目50438010);江苏省土木工程材料重点实验室开放基金资助项目;河北省建设科技资助

摘　　要：采用楔入劈拉试验方法,利用标准紧凑拉伸公式与楔入劈拉经验公式分别计算高强混凝土及混杂钢纤维高强混凝土的双K断裂韧度和断裂能,经比较发现用紧凑拉伸公式计算的失稳断裂韧度值是经验公式的0.85～0.87倍,因此建议采用尺寸符合标准紧凑拉伸要求的试件进行试验确定断裂韧度.分析了纤维混杂后纤维类型、纤维长度、纤维掺量对混凝土增强、增韧的影响,试验结果表明随着混凝土强度增加,断裂韧度、断裂能增大.最后建议高强混凝土采用双K断裂韧度作为韧性评价指标,高强钢纤维混凝土采用断裂能作为韧性评价指标.The double-K fracture toughness and fracture energy of high-strength concrete and hybrid-steel fiber reinforced high-strength concrete were calculated employing standard compacted tension（CT） formula and wedge splitting（WS） formula by wedge splitting test.By comparing two formulas,it is found that the unstable fracture toughness calculated by CT formula is 0.85 to 0.87 times of that calculated by WS formula,and adopting standard CT specimen can gain the exact test results by WS test with the specimen satisfying the size requirement for CT.The influences of fiber type,fiber length and fiber volume ratio on reinforced effect to concrete were analyzed.With the strength increasing,the fracture toughness and fracture energy both increase.In addition,it is proposed that the double-K fracture toughness is better to be used as the ductility evaluation criterion of high-strength concrete and fracture energy is better to be used as the ductility evaluation criterion of hybrid-steel fiber reinforced high-strength concrete.

关 键 词：混杂钢纤维高强混凝土 起裂断裂韧度 紧凑拉伸 楔入劈拉 失稳断裂韧度 

分 类 号：TU528.31[建筑科学—建筑技术科学]