The main application of geotextile in pavement structure
One of the main applications of geotextiles in pavement structures is to improve the anti-fatigue cracks, anti-reflective cracks, and anti-permanent deformation capabilities of asphalt pavements or overlays. The research on improving the anti-fatigue cracking performance and preventing the reflection crack is generally combined with the mechanical analysis of the formation mechanism of the reflection crack.
Some engineering applications explained the stress state of the asphalt concrete overlay on the old cement concrete pavement and theoretically discussed the formation mechanism of reflective cracks. The material with low modulus and high deformation rate as the interlayer can greatly reduce the stress concentration factor at the tip of the crack and play a role in preventing reflection cracks. wholesale polypropylene nonwoven geotextiles are the best in various preventive measures. Taking the elastic foundation beam as a model, the technology of preventing cracks in the asphalt road network is analyzed theoretically.
When the geotextile is spread on the pavement, the geotextile with large thickness, low elastic modulus, and large deformation rate can significantly reduce the temperature stress at the bottom of the asphalt concrete layer, but the effective stress caused by the load tends to increase. Laying a limited width geotextile interlayer at the joints of the old pavement can not only take advantage of the low modulus of the high quality polyester nonwoven geotextile but also avoid damaging the overall continuity of the pavement structure, thereby achieving the purpose of reducing the temperature stress and load stress of the overlay.
The connection between the test section and the conventional section appeared earlier, indicating that there are still weak sections in the variable cross-sections of the two structural layers where only the geotextile is laid, and special treatment is required during construction;
There are no reflective cracks at the joints covered by geotextiles (including expansion joints); under bad weather conditions, tiny cracks will appear at the joints of polyester nonwoven geotextile manufacturers. Over time, some cracks will heal, and some will It develops into a through seam, but the probability of occurrence is low, and a crack will appear. There are many through cracks at the joints without geotextiles. The occurrence rate of cracks in the south is 9.5% and that in the north is 9.8%.
The concrete slab covered with polypropylene nonwoven geotextile for sale has three pits and the geotextile is exposed. The reason is that when the paver spreads the asphalt concrete surface, the geotextile will curl, causing the asphalt concrete surface to peel off under repeated driving loads.
The engineering characteristics of geotextiles mainly considered in the application of pavement engineering include the following aspects:
1. Physical characteristics (thickness and mass per unit area);
2. Mechanical properties (tensile strength, grip, trapezoidal tear strength, burst strength, puncture strength, cone penetration strength, and creep characteristics);
3. Interface characteristics of geotextile and high quality polypropylene nonwoven geotextile interaction (direct shear strength and pull-out friction strength);
4. Hydraulic characteristics (porosity, pore size, and permeability of geotextile);
5. The durability of geotextiles (anti-aging, chemical corrosion resistance, building damage, temperature freeze-thaw, and the effect of changes in drying humidity on the performance of the fabric).
In order to reasonably select and apply filament nonwoven geotextile factory price, corresponding tests are carried out according to the different characteristics of geotextiles to correctly determine the design parameters.