水泥粉煤灰稳定碎石力学参数影响因素研究

Study on influence factors of mechanical parameters of cement fly ash stabilized crushed stone

采用水泥粉煤灰作为无机结合料稳定天然碎石,研究水泥剂量、粉煤灰剂量及养护龄期对无侧限抗压强度、劈裂强度及回弹模量等力学参数的影响。试验结果表明:无侧限抗压强度、劈裂强度及回弹模量随着水泥剂量的提高均呈现线性增长的趋势;无侧限抗压强度和劈裂强度随着粉煤灰剂量的提高均呈现先增长后减小的趋势,并在9%粉煤灰剂量时达到峰值,回弹模量随着粉煤灰剂量的提高呈线性减小的趋势;28和60 d的无侧限抗压强度较7 d的分别增长约30%和60%,28和60 d的劈裂强度较7 d的分别增长约50%和70%,28和60 d的回弹模量较7 d的分别增长约65%和120%。

Cement fly ash was used as inorganic binder to stabilize natural crushed stone.The effects of cement dosage,fly ash dosage and curing age on unconfined compressive strength,splitting strength and resilience modulus were studied.The results show that the unconfined compressive strength,splitting strength and resilience modulus increase linearly with the increase of cement dosage.The unconfined compressive strength and splitting strength increase first and then decrease with the increase of fly ash dosage,and reach the peak at 9%of fly ash dosage,and the modulus of resilience decreases with the increase of fly ash dosage.With the increase of curing age,the unconfined compressive strength of 28 and 60 d are increased by about 30%and 60%,the splitting strength of 28 and 60 d are increased by about 50%and 70%,and the resilience modulus of 28 and 60 d increased by about 65%and 120%,respectively compared with 7 d.