大粒径水稳砾石CSG-50劈裂强度增长规律

Variation Pattern of Splitting Tensile Strength in Large-Size Cement-Stabilized Gravel CSG-50

摘要: 随着公路建设的快速发展，对路面基层材料的性能要求日益提高。大粒径水稳砾石(CSG-50)因其优异的力学性能和耐久性而受到广泛关注。文章通过垂直振动试验方法(VVTM)研究了CSG-50的劈裂强度增长规律，与CSG-30作对比分析了养生龄期、水泥剂量和集料级配对其劈裂强度的影响。结果表明：随着龄期的增长，CSG-50的劈裂强度随水泥掺量的增加呈线性增长趋势；在试件成型的初期阶段，CSG-50的劈裂强度比CSG-30高出约1.30~1.33倍。在水泥稳定砾石的劈裂强度完全形成后，CSG-50的劈裂强度相比CSG-30高出约1.15~1.17倍。

Abstract: With the rapid development of highway construction, the performance requirements for pavement base materials are increasing. Large grained water stable gravel (CSG-50) has received widespread attention due to its excellent mechanical properties and durability. This article studied the growth law of splitting tensile strength of CSG-50 through vertical vibration test method (VVTM), and compared it with CSG-30 to analyze the effects of curing age, cement dosage, and aggregate grade on its splitting tensile strength. The results showed that as the age increased, the splitting tensile strength showed a linear growth trend with the increase of cement dosage; In the initial stage of specimen formation, the splitting tensile strength of CSG-50 is about 1.3~1.33 times higher than that of CSG-30. After the splitting tensile strength of cement stabilized gravel is fully formed, the splitting tensile strength of CSG-50 is about 1.15~1.17 times higher than that of CSG-30.