微裂后水泥粉煤灰稳定碎石力学性能变化规律研究

Study on Mechanical Properties of Cement Fly Ash Gravel Stabilized Macadam after Microcracking

为了更加科学合理地对微裂后水泥粉煤灰稳定碎石基层的力学性能进行评价,研究了微裂后水泥粉煤灰碎石力学性能的变化规律。本文定义水泥粉煤灰碎石材料早期微裂后抗压回弹模量的下降百分率为微裂程度,在利用SPSS软件对水泥粉煤灰碎石微裂程度的影响因素进行显著性分析后,基于响应面法建立了水泥粉煤灰碎石微裂程度控制模型,并研究不同工况下水泥粉煤灰碎石力学性能的变化规律。试验结果表明:当微裂时间为2 d、微裂程度30%、水泥掺量为5%、粉煤灰掺量为7. 5%时,混合料的整体力学性能优于其他情况。所得到的微裂程度控制模型及试验结果均可应用于实际微裂技术施工中,为微裂技术在实际工程中的推广应用提供理论基础。

In order to evaluate the mechanical properties of the microcracked cement fly ash stabilized macadam base more scientifically and reasonably,the change rule of mechanical properties of cement fly ash gravel after microcracking is studied.The percentage decrement of the early equivalent modulus of elasticity of the cement treated crushed stone material is defined as the microcracking degree in this paper,after using SPSS to analyze the influence factors of cement fly ash macadam microcracking degree,a control model of cement fly ash gravel microcracking degree was established based on response surface methodology.The change rule of mechanical properties of cement fly ash macadam under different working conditions is also studied.The results show that:When the microcracking time is 2 d,the microcracking degree is 30%,the cement content is 5%,and the fly ash content is 7.5%,the overall mechanical properties of the mixture are better than other conditions.Both the microcracking degree control model and test results obtained can be applied to the actual microcracking technology construction,and provide the theoretical basis for the popularization and application of microcracking technology in practical engineering.