Glass fiber grating construction method 1 treatment of laying pavement
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The effect of the glass fiber grating is closely related to the treatment of the paved road. Before laying, the materials on the road surface that may affect the bonding strength between the grid and the bottom layer, such as grease, paint, sealant, water stain, dirt, etc., must be completely removed. Clean and make the paving surface clean and dry. The pressure-sensitive back belly on the glass fiber grille is a water-soluble substance. If there is water on the road surface, it should be laid after the road surface is dry. It is necessary to sprinkle the adhesive layer oil before laying the grille. If the adhesive layer oil is used as emulsified asphalt, it is necessary to lay the grille after completely demulsification and drying.
2 laying and fixing of fiberglass grille
The grille can be laid by special equipment modified by tractors or cars, or it can be laid manually. Each end of the paper barrel of the fiberglass grille is marked with orange and blue marks. Before starting to lay, the glue should be selected to face down, and the color of the above marks should be determined at one end to facilitate construction without paving the plastic surface. wrong. When laying the grille, it should be kept flat, tight, and not wrinkled, so that the grille has effective tension. After the paving is finished, it is crushed again with a clean steel wheel roller.
At present, the commonly used glass fiber grids are available in self-adhesive and non-self-adhesive. The self-adhesive can be laid directly on the flat substrate, and the self-adhesive is usually used for the nail fixing method. The Yangzhou and Nanjing sections of Ningtong Highway use glass fiber gratings without self-adhesive glue. The required materials for fixing are:
150×50×0.3mm fixed iron sheet, it is required to be flat and not warped, and the periphery should be chamfered;
22 inch steel nails.
When the glass fiber grating is laid by the fixed steel nail method, the fixed iron sheet and the steel nail at one end are first fixed on the lower layer structure of the asphalt which has been sprinkled with the adhesive layer, and the steel nail can be injected by hammering or nailing. Then, the grid is longitudinally tensioned and fixed in sections, each length is 2 to 5 m. It can also be segmented by the shirring pitch, and the position of the steel nail is set at the seam. When the grid is tightened, the longitudinal and transverse directions of the glass fiber are in a straight and tight state.
The grid overlap is longitudinally overlapped, the overlap width is not less than 20cm, the lateral overlap width is not less than 15cm, and the longitudinal overlap should be placed on the latter one according to the asphalt paving direction. When fixing, the steel nail cannot be nailed to the glass fiber. The glass fiber cannot be directly hit with a hammer. If the steel nail is broken or the iron sheet is loose after fixing, it needs to be re-fixed. After the glass fiber grating is fixed and fixed, it must be properly rolled and stabilized with a rubber roller, so that the grid and the original road surface are firmly bonded.
In the actual construction, some construction units use the glued layer of oil to directly spread the fiberglass grille, and the road roller is compacted and then pressed, the effect is better, and the fiberglass grille is not easy to wave.
In the actual operation process, the quality of the construction has a great influence on the use effect of the glass fiber grating in the future. Therefore, it is particularly important to strengthen quality supervision and improve the technical level of construction workers.
3 Construction precautions
(1) Strictly control the vehicle entering and leaving the mixture, and prohibit the vehicle from slamming, braking and pouring the mixture material on the grid layer to prevent damage to the glass fiber grille.
(2) Glass fiber grille backing is easily soluble in water, and construction is not allowed on rainy days or when the road surface is wet.
(3) The glass fiber grating is made of glass fiber, which is easy to stimulate the human skin, and the construction personnel must wear protective gloves.
(4) When the rubber roller used in the machine needs to be filled with water to increase the weight, the water injection amount should not be too full to prevent overflow to the glass fiber grille, causing the back belly to lose its viscosity.
(5) During the laying process of the fiberglass grille, if it is found that the smaller pavement of the original pavement has not been filled first, the part corresponding to the pit pond can be cut off on the paved grille to mix the asphalt on the paved layer. The pit can be completely filled in when the material is used.
(6) When laying the grille, the pavement temperature is required to be between 5 °C and 60 °C.
4 Conclusion
(1) There are many types of fiberglass grilles used for asphalt pavement reinforcement in China, but the index of glass fiber grille is not clear, and the test methods and standards are not uniform. It is urgent to formulate product specifications, performance requirements and tests suitable for China's national conditions. Method standard.
(2) The use of fiberglass grid reinforced asphalt concrete pavement can greatly improve its structural performance, but the reasons for improvement have yet to be further studied.
(3) The fiberglass grid reinforced asphalt concrete surface used in the renovation of the old cement concrete pavement from Liuhe East to Yangzhou section of Ningtong Highway, from the current traffic conditions, the effect is ideal, due to the development of cracks requires a certain amount of time, The final effect of suppressing reflective cracks on glass fiber grids remains to be seen in the long term.
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