Generally speaking, the cracks of asphalt cold recycled concrete pavement can be divided into two types: one is the load type crack, which is mainly caused by the driving load. Under the action of vehicle load, tensile stress is produced at the bottom of semi-rigid base. If the tensile stress is greater than the tensile strength of base material, the bottom of base will crack quickly until it affects the asphalt surface; the other is non load crack, which is mainly low temperature shrinkage crack and temperature fatigue crack; the other is crack caused by improper construction technology or unqualified materials. The two types of cracks are shown by transverse cracks, longitudinal cracks, net cracks and reflection cracks.
The longitudinal crack phenomenon is: the crack strike is basically parallel to the driving direction, and the crack length and width are different. It usually occurs on the high fill subgrade. The longitudinal cracks are easy to form, which are stepped along the driving direction and affect the driving comfort.
The network crack phenomenon is: the crack crisscross, divides the surface layer into several polygon small pieces, generally the joint width is more than 1 mm, and the joint distance is less than 40 cm. Network Cracks lead to loose asphalt pavement or potholes, which seriously affect the comprehensive service level of SBS modified asphalt pavement.
The transverse cracks are as follows: the cracks are basically vertical to the center line of the road, the width of the cracks is different, the length of the cracks runs through the whole road width, some runs through part of the road width, and the cracks are curved, with branches and forks. The pumping in the transverse cracks leads to the depression on both sides of the cracks. The transverse cracks on the road surface at the bump at the bridgehead accelerate the speed of bump development under the action of water accumulation on the road surface, and at the same time cause erosion to the subgrade.
The reflection crack phenomenon is: after the base cracks, under the effect of temperature and traffic load, the cracks gradually reflect to the asphalt concrete surface, and the crack form of the pavement is basically the same as that of the base. For the semi-rigid base, the majority of transverse cracks, for the asphalt structure layer covered on the flexible pavement, the crack forms are different, which mainly depends on the underlying layer.
The above is the presentation of cracks in the cold recycling of road asphalt. I believe you all know it. For more wonderful information, please click our website: cold recycling machine rental http://www.sddhfjx.com