The construction of modified asphalt concrete _499

e707004304

The construction of modified asphalt concrete

Highway,[link widoczny dla zalogowanych], must adhere to the addition to the base in contact with the soil sub-base can be mixed with road construction method other than the layers above it should be a centralized site mixing paving construction methods to ensure the elevation, cross slope, strength, smoothness to meet the design requirements. (2) to strengthen grass-roots conservation, the construction is completed at the grassroots level, the use of impermeable film or wet sand to conservation, and should strictly control the traffic. If it is not closed to traffic, should be limited to heavy vehicle traffic, the speed should not exceed 30km / h, while other transport facilities should be noted that damage to the grass roots. (3) strict control of grass-roots level, paved surface with a 3m straight edge before the flatness of the grass-roots level detection, smoothness, and poor sections of greater than 8mm should be leveled. Paving the surface of base carefully before cleaning to ensure the primary surface clean, no loose material and impurities float, if the soil has also applied pressure water rinse. If the local grass-roots through the surface layer of asphalt or seal coat off,[link widoczny dla zalogowanych], the surface should be cleaned off at the grassroots level through the waiting shed, or make do asphalt seal coat. Drip into a hard surface such as slag cement, should be promptly removed, in order to ensure surface flatness. Pavement driving comfort to achieve this requirement, from the embankment began to attach importance to the construction preparation phase, all participating units of road construction works,[link widoczny dla zalogowanych], there is the bounden duty, we must strengthen the construction management, improve the construction technology and construction methods to improve construction quality, to the source, the fundamental solution to the problem, social benefits and social quality assurance. (Continued from page 2O) rolling, rolling overlap adjacent at least 50cm. Initial pressure, remains to the driven wheel in the post, to avoid the front wheel is easy to stay high temperature wave of flatness. Final pressure vibration of light with double driving dual-wheel roller to eliminate wheel tracks. Bridges, culverts and channels and other structures of the joints and a narrow place to be supplemented by a small vibratory roller quickly to ensure that the construction of temperature. 1.5 seaming modified asphalt joints should be closely connected smooth seams minimize. 2 sets of vertical joints is a paver one after the formation of hot joints, leaving the paved part of the rolling 10-20cm wide and temporarily, as a follow-up part of the base level, then a rolling cross-stitch, in order to eliminate stitch; Joints day one as far as possible, to improve the smoothness, with straight seams, after the completion of the asphalt pavement, not cooling, with a 3m straight edge along the vertical line segment end against the paving, ruler cantilever flat was like, paving the intersection of the layer and the ruler kerf position, together with a saw cut after the eradication of sewing machine and clean the joints with water, before the next construction of paving, brushing layers of oil , paver screed paving from the joint after the start, rolling the first time by the rolling-drum roller, each advancing a 1O 20cm, wait until the new paving layer of roller compacted length of more than 2 / 3 wide, In the U-turn vertical rolling. Construction Quality Control 2 official before paving 200m test section to check the adaptability of construction equipment, shop loose mixture coefficients and the compaction procedure, the number of times and the relationship between density and bitumen extraction tests and sampling for Gradation of the inspection. Success in the test section, and consent by the supervising engineer to formal facilities. 22 * work. Construction process, the daily haul from the mixing station and asphalt car in the samples from each of the first, the asphalt pits, Marshall test, mixed air voids and other sub-tests to check the quality of the mixture in order to detect and to take remedial measures. Arrangements for a full-time quality control personnel detect mixed feed temperature, paving the temperature and the rolling temperature, while the control room from time to time to check the amount of slag. Paving paving process should always check the thickness, roughness and cross slope, and to control the rolling speed and rolling roller a few times. Except after the completion of acceptance criteria for testing the quality of road surface roughness, thickness, elevation,[link widoczny dla zalogowanych], cross slope, compaction, width and other indicators, but also check the open shop law by sand after the pavement skid resistance of traffic. 3 Conclusion modified asphalt and mineral aggregate good adhesion to prevent flaking, loose, and have holes to keep the road smooth and full, improved driving comfort; modified asphalt paving mixture into a rough road surface structure , measured through the sand shop law is greater than the depth of minimum standards for the construction, so the pavement skid resistance in full compliance with requirements; modified asphalt prices high, but its durability, long maintenance cycle, driving comfort, safety, so the social benefits are significant. So it is a highly technical construction, a wide range of systems engineering. Strict quality assurance system, a reasonable construction process quality measures are necessary, therefore, to mobilize the enthusiasm of all the construction workers and responsibility, from all aspects of design and construction to proceed on the asphalt mix design, mixing, transport, paving ,[link widoczny dla zalogowanych], rolling, etc. Cengcengbaguan, strict management, to build a high quality asphalt pavement.