Research on Rapid Curing Technology of Lime-flyash-cement Stabilized Macadam

摘要

In order to solve the problem of long curing time and long construction time of projects, the early strength of lime and fly-ash stabilized macadam can be increased by applying the proper amount of cement. First, compressive strength, cleavage strength and compression rebound modulus of lime-fly ash-cement stabilized macadam are tested systematically applying standard curing (T: 20±2°C, RH: ≥95%) and high-temperature curing (T: 60±2°C , RH:≥95). Secondly, a relationship curve between strength and curing age is found by applying four different regression models. Thirdly, strength gain relationship between high temperature curing and standard curing is achieved. So, the 180-day strength by standard curing can be determined from the strength cured by high temperature curing. Fourthly, the microstructure of samples is observed and analyzed systematically by applying electron microscope scanning. By the way of high temperature curing, not only can the microstructure of it be improved, but also the curing time can be shortened. Therefore, design parameters and major control index of ratio design for the lime-fly ash-cement stabilized macadam base course construction can be confirmed rapidly.