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【正文】 bility and increase the antiaging ability, extend the life of the road. Compared with AH 70 matrix asphalt, the SBS asphalt viscosity and softening point increased significantly, the transportation of the SBS asphalt storage and there are some different from the matrix asphalt road surface construction requirements, only the correct use can achieve the desired effect. 1,mix the specification requirement shut, transporting To ensure the quality of asphalt mixture is more stable, asphalt dosage is more accurate, appropriate USES clearance mixer mixing. Mixing must be uniform, only the SBS asphalt modifier pletely dispersed in the asphalt, can give full play to its effectiveness, with dense gradation mixture (I) AC 13, should be after mixing the mixture of uniform, fine and coarse material separation and grey, forming a mass phenomenon. Because of the SBS modified asphalt mixture construction high temperature requirement, suggest the mixing temperature control at 160 ℃ , the carrier must build tarpaulin or any other thermal insulating materials, prevent hard binder surface, in order to ensure the continuous and paving flatness size conform to the requirements of the technical specification, must ensure that at least two cars waiting for unloading before paver, must not be, the phenomenon of the paver waiting for a bus. The rest of the requirements shall be satisfy the requirements of the modified asphalt pavement construction technical specification. 2,the specification requirement paved paving the technical requirement of SBS in asphalt mixture paving should be continuous construction as far as possible, to reduce the paver and roller pause, should try to reduce the horizontal seam, to improve the surface roughness. In order to improve the pavement smoothness, surface layer should adopt the sled type of paving the same eleva tion difference before and after paving thickness control mode. Due to large SBS asphalt viscosity, adhesion strength is strong, with some after sled is rubbertired structure of paver, roller easy adhesion mixture of fine particles, affect the flatness, so after the paver sled is a rubbertired structure sliding boots must change to steel structure. Paving speed should be controlled in 2 m/min, do it slowly, uniform, continuous uninterrupted paving, ban transform speed or stop at will. Improve the preloading pactness in the process of paving. SBS modified asphalt mixture under high temperature condition is mainly rely on embedded squeeze effect of coarse aggregate, can be appropriately increase rammer vibrating frequency, reduce the residual pacting factor, the trace of the initial pressure and tiny, further ensure the final pavement roughness. 3,the specification requirement rolled The proper rolling temperature range is 130 ℃ to 150 ℃ , its final rolling temperature is not lower than 110 ℃ . The SBS asphalt mixture pacting process in line with the following principles: according to keep up with, slow pressure, high frequency, lowrising rolling of eight lines rolling roller must keep up with the back of the paver, only under the condition of high temperature rolling can achieve better effect, paction speed control in 4 to 5 km/h. Rolling speed is balanced, back when close the vibration, the direction to gradually change, no twist curved to walk, for each rolling start or finish a bit twisted rolling, eliminate the rolling wheel track joint. Must not be allowed on the new layer asphalt mixture about steering, switching, mobile location. All of a sudden braking or stop to rest, through the first and second contract section of SBS asphalt south road test section, determine the paction process for DD110 or DD130 roller 23 gear rolling 3 times each, namely 1 times at the beginning of highfrequency lowrising vibration rolling 2 times, 2 times. Special note: if found during the construction of roller sticky wheel, better with detergent water, 4. the quality control of the asphalt mixture of SBS To one floor of mixture asphalt, the debulk result of the scene should adopt the spacerate and press the solidity to control is subject to that survey every day to calculate the largest density of theory needed in space rate, is it go on according to” asphalt road surface mixture heavy relative density test (vacuum law)
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