Jiang Yingjun, Wang Huatao, Yuan Kejia, Li Mingjie, Yang Ming, Yi Yong, Fan Jiangtao, Tian Tian
Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University, Xi'an 710064, China.
Henan Provincial Transportation Infrastructure Quality Inspection Station, Zhengzhou 450016, China.
Materials (Basel). 2022 Mar 14;15(6):2132. doi: 10.3390/ma15062132.
To study the mechanical properties of cement-graded crushed stone for use in the transition sections of intercity railways, the growth laws governing unconfined compressive strength, splitting strength and resilience modulus of cement-graded crushed stone and their influencing factors were studied by the vertical vibration compaction method (VVCM). The strength growth equations of cement-graded crushed stone are proposed, and strength prediction equations are established. The research shows the unconfined compressive strength, splitting strength and resilience modulus of cement-graded crushed stone with a strong interlocked skeleton density type (VGM-30) are significantly enhanced to 20, 20 and 17% higher, respectively, than those of standard cement-graded crushed stone. The growth law of mechanical properties of cement-graded crushed stone is similar, with the fastest growth occurring before 14 days, and the rate decreasing after 28 days. The strength growth tended to be stable after 90 days, increasing with the increase in curing time, compaction coefficient and cement dosage. The correlation coefficients (R) of the strength growth prediction models were found to be 0.99, 0.97, and 0.99, respectively. These values can be used to accurately predict the strength growth curve. This paper verifies the superiority of VGM-30 gradation through laboratory tests, providing a reference for gradation selection in the construction of intercity railway transition sections.
为研究用于城际铁路过渡段的水泥级配碎石的力学性能，采用竖向振动压实法（VVCM）研究了水泥级配碎石无侧限抗压强度、劈裂强度和回弹模量的增长规律及其影响因素。提出了水泥级配碎石的强度增长方程，并建立了强度预测方程。研究表明，具有强嵌锁骨架密实型（VGM - 30）的水泥级配碎石的无侧限抗压强度、劈裂强度和回弹模量分别比标准水泥级配碎石显著提高20%、20%和17%。水泥级配碎石力学性能的增长规律相似，14天前增长最快，28天后速率降低。90天后强度增长趋于稳定，随养护时间、压实系数和水泥用量的增加而增加。强度增长预测模型的相关系数（R）分别为0.99、0.97和0.99。这些值可用于准确预测强度增长曲线。本文通过室内试验验证了VGM - 30级配的优越性，为城际铁路过渡段施工中的级配选择提供了参考。
