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通过42个尺寸为100 mm×100 mm×515 mm的水泥稳定碎石三点弯曲试件断裂试验,探讨了试件养护龄期和水泥掺量对水泥稳定碎石断裂韧度(KⅠC)和断裂能(GF)的影响,并推荐出评价水泥稳定碎石断裂韧性合适的指标是断裂能。试验结果表明:随着养护龄期的增长,断裂韧度与强度有一致的变化规律,断裂韧度和断裂能均呈增大趋势,水泥稳定碎石抵抗裂缝扩展的能力逐渐增强;随着水泥掺量的增加,试件极限荷载和断裂韧度不断增加,但断裂能却逐渐减小,而且试件最大跨中挠度亦逐渐减小,断裂韧性逐渐减小。
Through the fracture test of 42 three-point specimens of cement-stabilized macadam with the size of 100 mm × 100 mm × 515 mm, the effects of curing age and cement content on the fracture toughness (KⅠC) and fracture of cement-stabilized macadam Can (GF), and recommend a suitable indicator of the fracture toughness of cement stabilized gravel fracture energy. The experimental results show that the fracture toughness and fracture strength change in a consistent manner with the increase of curing age, the fracture toughness and fracture energy increase with the increase of curing age, and the ability of cement stabilized gravel to resist crack propagation gradually increases. With the increase of curing age, With the increase of the content, the ultimate load and fracture toughness of the specimens increase continuously, but the fracture energy decreases gradually, and the maximum midspan deflection decreases and the fracture toughness decreases gradually.