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.