Causes and solutions of reflection cracks in steel plastic geogrid
Author: Hengke Shandong HuaSu Engineering Co., Ltd Time: August 24, 2020 11:16 Visits: second
Description: steel plastic geogrid will have reflective cracks due to the displacement of old surface layer at the joint or around the crack. The geogrid causes the stress concentration in the asphalt concrete overlay above the joint or joint. It includes the horizontal deviation caused by the change of temperature and environmental humidity and the longitudinal cutting deviation caused by the traffic load effect. Therefore, it can effectively reduce the adverse effects caused by load, temperature and foundation void, and improve the anti reflection crack ability of asphalt concrete overlay.
Causes of reflection cracks in steel plastic geogrid
? ? Steel plastic geogrid The main function of asphalt overlay on the old cement concrete pavement is to improve the service function of the pavement, but it has little contribution to the bearing function. The rigid concrete pavement under the overlay still plays a key bearing role. The asphalt overlay on the old asphalt concrete pavement is different, and the asphalt overlay will bear the load together with the old asphalt concrete pavement. Therefore, the asphalt overlay on asphalt concrete pavement will not only produce reflection cracks, but also fatigue cracks due to the long-term effect of load. We do the stress analysis of the asphalt overlay on the old asphalt concrete pavement: because under the asphalt overlay is a flexible surface with the same property as the asphalt overlay, when it is loaded, the pavement surface will be deflected. The asphalt overlay which is in direct contact with the wheel is under pressure, and in the area outside the wheel load edge, the surface layer is subject to tension. Because the two stress areas have different stress properties and are close to each other, Po damage is easy to occur at the junction of the two stress areas, that is, the sudden change of force. Fatigue cracking occurs under long-term load.
Reflection cracks are caused by the displacement of the old surface course at the joints or around the cracks, and the stress concentration in the asphalt concrete overlay above the joints or cracks caused by the geogrid. It includes the horizontal deviation caused by the change of temperature and environmental humidity and the longitudinal cutting deviation caused by the traffic load effect.
Therefore, it can effectively reduce the adverse effects caused by load, temperature and foundation void, and improve the anti reflection crack ability of asphalt concrete overlay; and according to the research, when adding geogrid at the bottom of overlay, the effect of delaying reflective crack is very obvious.
According to the basic theory of references, setting the glass fiber geogrid reinforcement layer between the old concrete slab and the overlay can reduce the stress or strain of the bottom surface of the asphalt concrete overlay because it leaves the joint or the end of the crack where the stress concentration is. In addition, it can also change the tensile and cutting resistance of the overlay structure. Furthermore, it can reasonably reduce the bad influence caused by load, temperature and subgrade void, and improve the anti reflection crack ability of asphalt concrete overlay; and according to scientific research, when adding geogrid at the bottom of overlay, the actual effect of slowing down reflective crack is more prominent.
The solution of reflection crack in steel plastic geogrid;
Generally speaking, the reflection cracks of steel plastic geogrids are normal, but the time and number of them are different according to the quality of the products. When buying, pay attention to the cost performance of goods. Above is about steel plastic Geshan reflection cracks and reduce countermeasures, hope to help you. From the cause of cracks, how to make the strength of asphalt concrete resist the tensile stress is the key to solve the problem. ?
The above is Shandong HuaSu Engineering Materials Co., Ltd. professional and technical personnel for your detailed introduction of steel plastic geogrid reflection crack causes and solutions, hope to help you, if you have steel plastic geogrid in this aspect of demand, please contact us or directly visit the factory to order!