- 大長老
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- Sealing materials extend the life of concrete pavement
- <P> cement concrete pavement structure as a form of advanced pavement, will produce a variety of diseases, such as not properly handled, will affect the function and life of the road. Through years of experience, summed up as long as the disposal of a good shrink cement pavement seams, at the same time to seize the early Pavement Cracking pouring preventive maintenance, it can effectively extend the life of concrete pavement. </P>
<P> reservation shrink seam processing in general, concrete pavement joints reserve thermal processing There are two main meanings: to prevent water infiltration damage to the roadbed; prevent foreign matter from entering the cracks caused by further expansion cracks and flaking. </P>
<P> For airports, there are two other aspects of crack treatment Significance: Some material may be sealed to avoid corrosion-resistant oil fuel deep corrosion pavement and grass, thereby reducing road pollution; foreign body can be reduced by anti-foreign material properties of the sealing material risk of damage to the aircraft may cause. </P>
<P> To this end, after analysis, thermal seam reservation process mainly involves the following aspects: Select the cement pavement crack sealing sealing material for a variety of materials to choose from. Including rubber asphalt construction heat, cold construction silicone, single-component or two-component anti-oil products. To achieve lasting results, we should choose the right products. Sealing material costs accounted for only 20-25% of the entire pouring construction costs, therefore, the choice of the sealing material, recommended that users choose and purchase a standard-setter proven through long-term material, rather than unproven price expensive materials. </P>
<P> At the same time, the material selection should consider the following factors: the area where the road appears winter and summer temperature extremes. In order to achieve the best sealing effect, the sealing material should be at extremely low temperatures in winter can still maintain flexibility and scalability, without overflow in extreme heat in summer, and can be prevented from being swept away by the tires. Whether the sealing material will be faced with other circumstances, such as the effects of exposure to fuel or jet stream, if it is, the material must be fire-resistant oil and jet types. </P>
<P> must consider the size of the joint to be treated in order to select the appropriate size according to the sealant. When applied to the slit, the sealing material must be self-leveling, but also to the low viscosity so that material can flow into the cracks. When the need to re-fill irrigation with surface flaking and damaged old seam sealing material should have a low fluidity and fast setting property and anti-settlement of. </P>
<P> exercise factors should be considered by the joint width, size and temperature difference caused by the Area. Exercise based on the data available at design time.
Reserved shrink seam sealing seam construction usually selected according to the width of the right material and the aspect ratio for construction, sunken construction to be used, the bottom place mat strip. Location pad strip in about twice the depth of the slit width. Seam cleaning is very important, the general sawing grooves, then sand using water guns or other means, to produce a complete and clean vertical surfaces to be bonded. Whether it is or reseal the first seal, so that it can have to ensure that the final seal. The new standard pavement seams 1 cm wide, new pavement narrow seams While cost savings during design and construction, but the cause of each seam bear tensile stress, it is necessary to adopt anti-stretch and low viscosity when this kind of seal seams glue. </P>
<P> reseal. First remove the old seal material, re-cut, so that the new cut out the old seam slit width, must be strictly clean, new and clean formation of a new seal. For oil contaminated areas must be sealed with a material resistant oil, hot asphalt construction products do not apply. If long-term exposure to jet exhaust area (such as parking lots, toll stations, etc.) should be used in high-temperature exhaust gas anti-material construction due to the heat seal material is easily melted high temperature or high pressure blown away, and silicone has good resistance to high temperature capability , it is more appropriate for the region. In addition, the parking lot or sidewalk area used for the sealing material must be able to resist torsional torque and summer high temperatures slow walking pace car tires, thus ensuring a certain flexibility while having a good supportive </P>
<P> tackle road is one of the early cracks cracks with asphalt concrete pavement diseases co-exist, which seriously affected the life of the road, many years of experience has shown that pouring is the key road preventive maintenance phase is to extend life, creating one of the effective means to maximize economic and social benefits. Cement pavement crack treatment construction process required grooving, cleaning, filling sealing material. When you select should pay attention to the choice of sealing materials on the cement pavement suitable sealant. Some modified asphalt sealant on Asphalt Pavement good results, but in the cement pavement performance was not so good. There are also some modified asphalt sealant suitable both for cement and asphalt pavement. Silicone is also very good, although at a higher cost, the benefits are not sol equipment, and general construction of modified heat sealing glue construction cost about the same. Under normal circumstances, broken concrete road between the plates are in contact with the place, if old-fashioned rigid construction materials need to make basting, flexible material like this does not need false seam. Proven five years, the effect of this material is really good, no cracking, with the original road surface contact wall adhesive did not fail. The disadvantage is the high cost. Compared with traditional methods, this cost includes not only the high cost of materials, including high equipment costs. Special material due to the material, the construction material to be heated, but very viscous after heating, heated stirred tank generally difficult the material is heated to the desired temperature with stirring, and therefore the use of special mixing equipment. The use of new materials of construction, equivalent to several times the cost of repair is generally rigid. It is not possible large-scale use. However, in view of its good performance, the proposed new bridge at breakage or new concrete pavement, or corrosion-resistant oil need places such as parking lots, toll stations and other places use. </P>
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- Re: Sealing materials extend the life of concrete pavement
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