After the mixture ratio test of cement stabilized macadam subbase is completed, the influence of the delay time of cement stabilized macadam (the interval time from mixing with water to specimen molding) on the performance of cement stabilized macadam should also be tested.
After mixing the mixture with the proposed cement dosage, the test pieces were made with a delay of 65438 0 hours, 2 hours, 3 hours, 4 hours, 5 hours and 6 hours respectively. After curing to the specified age under standard curing conditions, the unconfined compressive strength test is carried out, and the relationship curve between delay time and strength is drawn according to the test results. According to the relationship curve between delay time and strength and the required strength, the allowable delay time in the construction process is determined.
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Precautions:
Generally, the paving of asphalt pavement should be started after the completion of other projects, so as to avoid the damage and pollution of the pavement. At the same time, the concrete base should be cleaned, and the paving can be carried out only after the drainage slope condition is met.
In the landscape, the roadway generally adopts modified asphalt pavement, the asphalt thickness is 70mm, the bottom layer is 40 thick coarse particles, the particle size is 16mm, the surface layer is 30mm, and the particle size is10-12 mm. If the road needs heavy trucks, the particle size of the surface layer needs to be increased to13 mm.
When paving the coarse-grained layer, it is necessary to maintain a stable speed and spraying amount. When paving the mixture, the transportation distance should not be too far, and the thickness should be uniform. Rolling times should not be too few, at least three times, to ensure that the gap between the mixture is not too big. Generally speaking, the coarse-grained layer can't be replenished.
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