Influence Of Different Curing Conditions On Road Performance Of Semi-rigid Base Material

For the curing of semi-rigid road base materials,the standard curing temperature and humidity of indoor laboratory is constant(for example,the standard curing temperature and humidity in the north is 20? and more than 90%),and the materials have been in the standard curing state of constant temperature and humidity.However,the actual curing temperature and humidity of semi-rigid base materials at the construction site vary with the change of climate conditions,especially for the highway construction in cold regions(for example,the highway construction period in Harbin is from May to October),the temperature difference between day and night is relatively large,and the temperature and humidity difference between months is also large.Therefore,in the same curing time,the mechanical properties of semi-rigid base material formed under the laboratory standard curing conditions are different from those under the actual site curing conditions.In order to be able to simulate outdoor actual health preservation indoors,this paper puts forward the concept of daily stage temperature and humidity,which divides the temperature and humidity of 24 hours a day into several stages,and adopts the weighted average value of hourly temperature and humidity in the same stage.In order to compare the mechanical properties of semi-rigid base materials under the standard curing conditions,the daily temperature and humidity in different areas are used as curing conditions to simulate the site curing of semi-rigid base materials in indoor,and then evaluate the differences between the site curing and indoor standard curing of semi-rigid base materials.Because of the great difference of temperature and humidity in Heilongjiang area,Heilongjiang area is divided into two parts:North and south.Harbin city is the representative in the south,and Mohe County is the representative in the north.In this paper,the unconfined compressive strength,splitting strength,dry shrinkage and temperature shrinkage tests are carried out with cement stabilized macadam and cement stabilized soil as base materials.The results show that the intensity of 7-day indoor simulated site curing in Harbin area is 12.7%and 15.2%higher than that of 7-day indoor standard curing,and the splitting strength is 22%and 27.7%higher.The unconfined compressive strength and splitting strength of 5-day outdoor curing have reached the intensity of indoor standard curing.In Mohe area,the intensity of 2-day indoor simulated site curing is 12.7%and 15.2%higher than that of 7-day indoor standard curing The strength of indoor simulated site curing for 7 days is 23.6%and 25%higher than that of indoor standard curing for 7 days,and the splitting strength is 14.8%and 24%higher,and the unconfined compressive strength and splitting strength of outdoor curing for 5 days have reached the strength of indoor standard curing;the shrinkage coefficient of outdoor 5 under the two materials is roughly the same as that of indoor standard curing for 7 days.The test results show that the intensity of indoor standard curing can be achieved by outdoor curing for 5 days,and the change of temperature and humidity is more conducive to the formation of intensity.The research results have certain theoretical and practical value for evaluating the influence of the difference between the site and indoor standard curing on the mechanical properties of semi-rigid base materials.