Asphalt No. 30 | Asphalt drilling fluid treatment agent | Oxidized asphaltQingzhou Tianyi Chemical Co., Ltd

1. Elements that make up asphalt cracks

1.1 Stretching of leaching layer

Asphalt refers to a viscous elastic material, which largely depends on temperature. When the asphalt material is under high temperature conditions, cable asphalt manufacturers generally exhibit varying degrees of looseness. Although the deformation caused by temperature rise and fall does not cause severe temperature stress, assuming that it exists in this temperature environment for a long time, asphalt materials will continue to harden and begin to shorten, and their low-temperature characteristics do not meet engineering planning standards. In addition, due to the semi hardness of the bottom, when the stress of the asphalt mixture weakens to a certain condition, tensile stress will be generated, and the stiffness of the mixture will increase rapidly. The asphalt layer on the sidewalk will receive greater pressure, and then the tensile strength of the asphalt mixture will decrease and form cracks.

1.2 Lack of travel density

In road planning, vehicle loading is primarily combined with travel construction standards. After the travel construction is completed, it is necessary to ensure that the functional requirements are satisfied, and the depth of the travel work area is fixed at this moment. When the vehicle is overloaded during the journey, the depth of the journey work area will increase. The emergence of congestion issues directly leads to the crossing of standard planning in the depth of travel practice work areas, and problems in depth, stability, stiffness, and other aspects are constantly increasing. D. Outside the untreated road surface, it will become abnormal. After traveling for a period of time, vehicles will exhibit varying degrees of cracks, settlement, trajectory, deformation, and other issues on the sidewalk.

1.3 Crack reflection

The reflection of bottom cracks leads to surface cracks, and the reflection of bottom cracks leads to bottom cracks and other phenomena, generally resulting in reflection cracks on asphalt pavement. Temperature cracks are generally in the upper and lower states, with a few cracks attributed to surface and bottom layer cracks, while surface layer cracks are found separately. Assuming from the perspective of temperature expansion coefficient, the asphalt surface layer is significantly larger than the inorganic binder stabilized soil, the cable asphalt manufacturer then, at the same time, the orientation, temperature environment, and temperature shortening stress of the asphalt layer are greater than those of the bottom layer, which are key factors leading to temperature cracks. Regarding the new semi-rigid bottom layer, the impact on the internal pavement structure of the bottom layer cannot be ignored due to the decrease in water content of the mixed liquid. In the semi-rigid bottom layer, dry shortened cracks covered by the asphalt layer appear. Assuming the leaching layer is thin, cracks in the semi-rigid bottom layer often cause the first cracking of the surface and bottom due to temperature stress, accelerating the formation of reflection cracks.

1.4 Shortening of Bottom Dry Heat

Due to excessive scattering of moisture in the mixture, this may lead to dry shrinkage cracks in the semi-rigid bottom layer. The monotonic shortening property is directly related to the size of the material and water consumption. Inorganic stable fine-grained soil has a greater dry shortening deformation than stable coarse-grained soil, which presents a more simplified cracking problem. Assuming water loss reaches 25%, the monotonicity coefficient of lime soil reaches (1200-1500). When the moisture content of cement stabilized gravel reaches 50%, the dry shrinkage coefficient is (5.3-8) × 10-6, and the dry shrinkage deformation is (13-18) × 10-6.

The main reason for low heat shortening is due to the different conditions of semi-rigid bottom layer production, especially during summer construction. After winter, due to the decrease in temperature, the mixture will continue to shorten at low temperatures, resulting in a shortened stress that does not meet the requirements. When the shortened stress crosses the ultimate tensile strength of the mixture, it will lead to the formation of temperature induced cracks. The width of these cracks is generally between 2 and 16 millimeters, and the larger the temperature difference, the more likely the mixture will crack. According to construction experience, asphalt pavement has certain crack rules: when the stress of the mixture crosses the tensile strength of the material due to temperature drop, the first crack will appear. If you have any other questions, please refer to the official website of the cable asphalt manufacturer or contact us directly.