Long-term supply fiberglass grating

Fiberglass geogrid is an enhancement for the road, the old road reinforcement, reinforcement of good geotechnical roadbed and soft soil foundation of synthetic material. Fiberglass geogrid high-strength E-glass fiber mesh substrate warp through the international advanced technology, semi-rigid products made of surface coating process. Having a warp and two-way high tensile strength and low elongation, and high temperature resistance, low cold, anti-aging, corrosion resistance and other excellent properties, widely used in asphalt pavement, concrete pavement and roadbed and rail enhancements subgrade, embankment slope protection, airport runways, desertification and other projects. Fiberglass geogrid action principle 1, reflecting slowing reflective crack crack is due to the old concrete surface layer in a large displacement caused by nearby joints or cracks in the asphalt overlay over which stress concentration caused by, including due to temperature and horizontal displacement resulting from changes in humidity, and vertical shear displacement due to traffic loads generated. The former leads to a higher concentration of tensile stress in the joints or cracks appear above the asphalt overlay; the latter so that the seam above the asphalt overlay is subjected to a greater flexural tensile and shear stresses. Since geogrid modulus big, reaching 67Gpa, as the rigidity of the hard layer application in bituminous surface layer, its role is to inhibit the stress, strain release, at the same time as the asphalt concrete reinforcement materials to improve the overlay structure tensile and shear capacity, so as to achieve the purpose of reducing crack. Practice shows that the fracture energy corresponding to a change in the direction of the horizontal cracks may start moving from 0.6 meters, 1.5 meters above the width of the reinforcement material help to ensure energy on both sides of the crack completely dissipated. 2, anti-fatigue cracking on the old cement concrete pavement asphalt overlay, whose main role is to improve road use function, the role of carrying the little contribution, rigid concrete pavement overlay under still plays a key role in bearer. The asphalt overlay on old asphalt concrete pavement is different, asphalt overlay will host together with the old asphalt pavement. Thus, the asphalt concrete pavement asphalt overlay, except there will be reflective crack, but also because of the long-term effect of load and fatigue cracking. Our asphalt overlay on old asphalt concrete pavement Loaded situation do stress analysis: Since asphalt overcoat for the same asphalt overlay layer of the flexible nature of the surface layer, when subjected to load, the road surface will bend happen Shen. In bituminous surface layer in direct contact with the wheel under pressure, at the edge of the area outside of the wheel carrier, the surface layer subjected to tensile force, due to the nature of the force on two different forces by area, but close to each other, so the two affected the junction area of ??the force that is likely to occur at a force of mutations damage. In the long-term load, the occurrence of fatigue cracking. Fiberglass geogrid in bituminous surface layer, can be said of compressive stress and tensile stress dispersion in the two buffer zone between the force in the region, where the stress gradually change rather than mutation, the mutation reduces the stress on the asphalt overcoat layer destruction. While low elongation fiberglass geogrid reduced the amount of surface deflection to ensure that the transition does not occur pavement deformation. 3, high temperature rutting asphalt concrete rheology at high temperatures, in particular in: summer asphalt road surface soft, sticky; in the vehicle load, the force generated depressed area, the vehicle load can not be completely removed asphalt surface return to pre-load by the situation, which produce the plastic deformation; under repeated rolling action vehicle accumulation of plastic deformation, the formation of ruts. After we have analyzed the structure of the asphalt surface, we can know due to high temperature asphalt concrete rheology, and when subjected to load, the surface layer without any lapse can constrain asphalt concrete aggregate movement mechanism, causing the asphalt surface layer, This is the main reason for the formation of ruts. Use fiberglass geogrid in bituminous surface layer, which functions as a skeleton in the asphalt surface layer. Asphalt concrete aggregate throughout the inter-grid to form a complex mechanical interlocking system, limit the aggregate exercise, increase the asphalt overlay layer lateral binding asphalt surface of each section to contain each other, to prevent the asphalt surface goes, and thus play the role of resistance to rutting. 4, anti-cold shrinkage cracking asphalt road cold regions, winter temperatures close to the temperature of the surface layer in such temperatures, cold asphalt concrete shrinkage, tensile stress. When the tensile stress exceeds the tensile strength of asphalt concrete, cracks, cracks in the places where the crack form of disease. From the Cracks of view, how to make asphalt concrete strength to resist the tensile stress is the key to solving the problem. Fiberglass geogrid in asphalt overlay layer, so that the tensile strength of asphalt concrete is greatly improved, can withstand large tensile stress without damage occurs. Further, even if the local area to crack, the stress cracking occurred at too concentrated, but by passing fiberglass geogrid gradually disappear, no cracks will develop into cracks. In the selection of fiberglass geogrid, in addition to the performance indicators should be consistent with the provisions of the table, should also pay particular attention to ensure that their width not less than 1.5m, there is enough to meet its cross-sectional area as the reflective crack control interlayer fully dissipate fracture energy; at the same time, the mesh size should be on the asphalt surface material maximum particle size of 0.5 to 1.0 times, which helps to achieve the best shear adhesion promoting aggregate embedded lock and limitations. Fiberglass geogrid main purposes: 1. Old asphalt concrete pavement, reinforced asphalt surface enhancement, disease prevention and control. 2. Cement Concrete Pavements composite pavement, causing reflex inhibition plate contraction cracks. 3. Extension of road improvement works, combining old and new prevention unit and uneven subsidence caused cracks. The soft soil reinforcement radical treatment in favor of the consolidation of soft soil analysis of water, effectively inhibit the settlement, a uniform stress distribution, enhance the overall strength of subgrade. 5. The new road semi-rigid base layer shrinkage cracks, foundation reinforcement enhanced to prevent crack reflection caused pavement cracks. Classification and construction methods now commonly used fiberglass geogrid with a self-adhesive and non-self-adhesive two, with a self-adhesive can be laid at the grassroots level have a direct, non-self-adhesive, usually in a nail fixation. 1, the construction site: Requires compaction level, is horizontal, clear spikes projections. 2, grid lay: on flat compacted site, installing laying grille its main force direction (vertical) axis should be perpendicular to the direction of the embankment, laying should be smooth, without wrinkles, the tension as much as possible. Ballast fixing nailing and quarrying, laying grille main direction of the force is the best long pass no joints, connecting web between the web can be manually banding lap, lap width of not less than 10cm. Such as setting the grid in two or more joints should be staggered between layers. After laying a large area, to adjust its overall flatness. When filling covered with a layer of soil, not before rolling should again tensioned by manual or machinery grille, the intensity should be uniform, so that the grille in the soil as Bengzhi stress state. 3, the choice of filler: filler design requirements should be selected. Practice has proved that, in addition to frozen soil, swamp soil, garbage, chalk, diatomaceous earth can be used as filler outside. But of gravel soil and sandy soil mechanics stable performance, by the water content has little effect, should be preferred. Particle size no larger than 15cm, and pay attention to controlling the filler size distribution, in order to ensure compaction weight. 4, packing paving and compaction: When laying the grill positioning should promptly fill Covered, Uncovered time shall timeout 48 that can take side laying backfill side of assembly-line method. First at both ends paving filler, grill fixed, again the central forward. Laminated on both sides after the first order is intermediate. When the pressure roller is not in direct contact with the compacted reinforcement, not compacted reinforcement generally not allowed to travel on top of the vehicle, in order to avoid dislocation of reinforcement. Stratified degree of compaction 20-30cm. Compactness must meet the design requirements, and this is the key to success reinforced soil engineering. 5, waterproof and drainage measures: the reinforced earth works, drainage treatment must make internal and external wall; to do foot care, anti-erosion; the body to be set in the soil filter, drainage measures, if necessary, should be set geotextiles .