混凝土楔入劈拉试件预制裂缝类型对断裂能的影响  

Effect of incision shapes of prefabricated crack on fracture energy of concrete w edge splitting specimens

作　　者：田傲霜[1] 王学志[1] 

机构地区：[1]辽宁工业大学土木建筑工程学院,辽宁锦州121001

出　　处：《混凝土》2011年第8期67-69,72,共4页Concrete

基　　金：国家自然科学基金项目(50709013)

摘　　要：对4种不同预制裂缝切口形式的普通混凝土试件和碾压混凝土试件进行楔入劈拉试验,得到了各种工况下不同切口形式试件的断裂能。分析了预制裂缝切口形式对楔入劈拉试件断裂能的影响。试验结果表明:锯开形成切口的试件断裂能最大,切口形式为V型的试件次之,预埋钢片的试件再次之,而缝端有一定宽度的试件断裂能最小。预制裂缝切口形式对普通混凝土断裂能的影响较大,对碾压混凝土断裂能的影响较小。几种预制裂缝切口形式下的楔入劈拉试件断裂能测试中,采用尖端V型的钢片预制裂缝效果较好。The wedge splitting test for four different incision shapes of prefabricated crack of plain concrete and roller compacted concrete spec-imens was carried out and fracture energy were obtained.The effect of incision shapes of prefabricated crack on fracture energy were compared on the analysis of tests results.It indicates that fracture energy of those sawed specimens is the largest,those of V-shaped incision specimens takes the second place and those of embedded steel plate specimens is the third,while those of rectangle shaped incision specimens is the smallest.The re-sult showes that incision shapes of prefabricated crack has more influence for plain concrete than roller compacted concrete.V-shaped incision pre-fabricated crack is preferable when the wedge splitting test is required.

关 键 词：普通混凝土 碾压混凝土 断裂能 楔入劈拉试验 预制裂缝切口形式 

分 类 号：TU528.01[建筑科学—建筑技术科学]