Construction process of asphalt driveway | FEITENG
GerryJarlSprinkle method of asphalt driveway surface construction
Sprinkler method of construction of asphalt driveway surface treatment and asphalt penetration of two kinds of asphalt surface treatment is asphalt and fine mineral material layered into a thickness of not more than 3cm thin layer of pavement surface layer, usually paved layer method of construction, according to the number of levels of sprinkler asphalt and spreading of mineral material can be divided into single-layer, double-layer and three types of three types of single-layer and double-layer for a portion of the three-layer type.
The construction process of three-layer surface treatment is as follows:
Clean up the grass-roots level, before the construction of surface treatment, the road surface grass-roots level should be cleaned up, so that the grass-roots level of most of the exposed minerals, and keep dry; if the grass-roots level of the overall strength is insufficient, then it should be reinforced first.
Sprinkle penetrating layer (or sticky layer) asphalt, sprinkle the first layer of asphalt asphalt should be sprinkled uniformly, when found after the sprinkling of asphalt blank, missing edges, should be immediately into the work of supplementing the sprinkle, there is an accumulation should be scraped immediately. Construction should be used asphalt sprinkler spraying asphalt, the length of the sprinkler should be coordinated with the spreading capacity of the mineral material. Asphalt sprinkling temperature should be determined according to the construction temperature and asphalt grade, in general, petroleum asphalt should be 130 ℃ ~ 170 ℃, coal asphalt should be 80 ℃ ~ 120 ℃, emulsified asphalt should be dispersed at room temperature.
Spreading the first layer of mineral material: sprinkle the main layer of asphalt, should be immediately after the mineral spreading machine or into the work of spreading the first layer of mineral material. Mineral material should be spread evenly, to achieve full coverage of a layer, the thickness of the same, the mineral material does not overlap, do not show asphalt, when the local lack of material or too many places, should be appropriate to find fill or sweep.
Rolling: after spreading a section of mineral material, with 60 ~ 80kN two-wheel roller rolling. Rolling, should be pressed from one side of the edge of the road to the road, it is appropriate to crush 3 ~ 4 times, the speed should not exceed 2km / h, and can be increased appropriately.
Sprinkle the second layer of asphalt, spread the second layer of mineral material, rolling, and then sprinkle the third layer of asphalt, spread the third layer of mineral material, rolling.
Initial maintenance:After the asphalt surface treatment, initial maintenance should be carried out. When found to have oil flooding, should be in the oil-flooded parts of the fill sprinkle and the last layer of mineral material specifications of the same embedded material and uniform; when there is too much floating mineral material, should be swept out of the road; when there are other damages, should be repaired in a timely manner.
Asphalt penetration type pavement is porous structure, in order to prevent the road surface water intrusion and enhance the water stability of the pavement, the surface layer of the top layer should be spread sealing material or paving mixing layer, and when the asphalt penetration layer as a joint layer, may not be spread surface sealing material. Asphalt penetration type pavement is suitable for secondary and secondary roads, the thickness of 4 ~ 8cm, but emulsified asphalt penetration type pavement thickness should not be more than 5cm, when the penetration layer of the upper part of the asphalt mixture paving layer of paving surface layer, the total thickness of 6 ~ 10cm, of which the mixing layer thickness should be 2 ~ 4cm.
Asphalt pavement construction process is: sweeping grass-roots level → sprinkle penetrating layer or sticky layer of asphalt (emulsified asphalt penetration or asphalt penetration thickness of less than 5cm) → sprinkle the main layer of mineral material → grinding → sprinkle the first asphalt → sprinkle the first embedded material → grinding → sprinkle the second asphalt → sprinkle the second embedded material → grinding → sprinkle the third asphalt → sprinkle sealing material → grinding → initial maintenance.
Hot mix asphalt mixture pavement construction can be divided into two stages: mixing and transportation of asphalt mixture and on-site paving.
In the mixing of asphalt mixture, should be based on the determination of the ratio of test samples, test mix of various minerals and asphalt used should be strictly measured, the sample of the asphalt mixture after the test, you can select the construction ratio.
Paving construction process:
Grass-roots preparation and sampling, paving asphalt mixture before, should check to confirm the quality of the lower layer, when the quality of the lower layer does not meet the requirements, or not in accordance with the provisions of the sprinkler permeable layer, sticky layer of asphalt or paving hot under the sealing layer, shall not be paved with asphalt surface layer. In order to control the paving thickness of the mixture, after preparing the base layer, measurements and samples should be taken, i.e. sample stakes should be set along the centerline of the road surface and at one-fourth of the width of the road surface to mark out the loose paving thickness of the mixture. When an automatic leveling paver is used, a control datum line guiding the direction and elevation of the paver run should be placed.
Milling, compaction of asphalt mixture should be consistent with the smoothness and compaction of the French language, therefore, asphalt mixture should not be more than 10cm thickness of each layer of milling molding, otherwise it should be divided into layers of paving and compaction, the milling process is divided into the initial compaction, re-pressing and final compaction of the three stages. Initial compaction is carried out at a higher temperature after the mixture is paved, it is appropriate to use 60 ~ 80kN double wheel roller slow speed uniform rolling 2 times, the rolling temperature should be in line with the requirements of the construction temperature, after the initial compaction should be checked for smoothness, the road arch should be adjusted appropriately if necessary; re-compacting is in the initial compaction, the use of heavy-duty wheeled roller or vibratory roller rolling 4 to 6 times, to achieve the required compaction, and no significant wheel marks, therefore The final pressure is the main stage to achieve the required compactness; the final pressure immediately after the re-pressing, the final pressure to choose 60 ~ 80kN double roller rolling not less than 2 times, and should be eliminated in the rolling process of the wheel tracks and to ensure that the road surface of the good flatness.
Joint construction, various construction of asphalt driveway, including longitudinal joints, transverse joints and old and new road joints, etc., often due to insufficient compaction, prone to produce steps, cracks, loose and other quality accidents, affecting the smoothness and durability of the pavement. The contents, requirements and precautions of joints are as follows:
Paving with echelon operation of the longitudinal over the use of hot joints. Construction should be first paved paved mixture left l0 ~ 2Ocm width temporarily when not crushed, as the elevation of the paved part of the elevation of the reference surface. Longitudinal joints should be paved immediately after the paving part of the paving, the roller should be most of the pressure in the pavement has been first paved and crushed, only 10 ~ 15cm width pressed in the new paved lanes, and then gradually move across the seam crushing to eliminate the seam.
Half of the construction or longitudinal joints connected with the old asphalt driveway, can not be used hot joints, it is appropriate to add a baffle or the use of cutter cut flush. Before paving the other half, the edge of the seam must be cleaned and brushed with tack coat asphalt. Paving should be overlapped on the paved layer of 5 ~ 10cm, paving the first half of the paved mixture will be shoveled away. Rolling first in the compacted road surface, rolling the new pavement layer 10 ~ 15cm, and then gradually move across the longitudinal joints, the longitudinal joints will be compacted. The longitudinal joints of the upper and lower layers should be staggered by more than 15cm. The longitudinal joints of the surface layer should be straight and located at the drawing line position of the lane.
The transverse joints shall be perpendicular to the road centerline. The transverse joints of two adjacent and upper and lower layers should be staggered by more than lm. For highways and first-class highways, the transverse joints of the middle surface layer and the lower layer can be slanted, but in the upper layer should be made into vertical flush joints, i.e. flat joints. All layers of other grades of highway can be pressed diagonally. When paving joints, some hot mixture can be laid on top of the compacted part to make it preheat and soften, so as to strengthen the bonding of the old and new mixture. However, the mixture used for preheating should be shoveled out before starting the rolling.
Slant joints of the lap length and thickness, appropriate for 0.4 ~ 0.8 m. Lap should be clean and sprinkle adhesive layer of asphalt, slant joints should be fully compacted and lap leveling.
Flat joints should be tightly bonded, fully compacted, smooth connection. Joints should be clean, cut flush, the edge of the adhesive layer of asphalt, and after its compaction with a hot iron, then in the seam coated with adhesive layer of asphalt, sprinkle stone powder sealing to prevent water seepage!