The traffic shall be closed during the whole curing period, and no vehicle except sprinkler is allowed to pass.
After the paving of the first layer is completed, the bulldozer shall be used to discharge the pressure, and the pressure shall be discharged in place.
(5) Lime fly ash macadam paving can be leveled by grader and bulldozer according to the width and length of the operation section, and some parts can be leveled manually, or roughly leveled by bulldozer and finely leveled by hanging meter line manually.
Before paving the next section, the formed lime fly ash macadam base shall be manually removed from the section with poor end flatness (check along the paving direction with a 5m aluminum alloy ruler to prevent “head warping” or “head lowering”), and the stubble shall be chiseled manually, and the mixture shall be paved after watering the joint to wet the joint, so as to facilitate the good combination of the new and old construction sections.
2.2 according to the geometric dimensions of the road centerline, base course width, central divider and shoulder fill, hang the sideline to construct the excavator or manual soil cultivation tank.
(3) Lime fly ash macadam base shall not be constructed when the temperature is lower than – 5 ℃.
(3) When paving lime fly ash macadam, the water content shall be controlled between – 1% – + 1.5% of the optimal water content.
Click the blue words above to pay attention to our operation instructions for lime fly ash macadam base construction.
Lime fly ash macadam base construction shall be suspended in continuous rainy days.
During rolling, the construction shall follow the principle of light before heavy, slow before fast, and from low to high.
If the design thickness of lime fly ash macadam exceeds 20cm, it shall be paved in two layers.
At the same time, a certain proportion of cement or sodium chloride antifreeze shall be added when mixing the mixture.
Preparation 2.1 before paving lime fly ash macadam, the subbase shall be properly watered to keep wet.
If the water content and fly ash content are large, it will affect the later paving, leveling and rolling work, and have a great impact on the strength of the whole lime fly ash macadam base.
(2) The lime fly ash macadam base that has been paved but has not been rolled in time shall be rolled after the rain stops and dried to an appropriate moisture content.
Leveling shall be carried out in time during initial pressing, and thin layer leveling shall not be pasted.
In case of special circumstances, the water content of the mixture shall be reduced.
No dead corner of missing discharge is allowed, and then the self-propelled vibratory roller shall be used for vibration compaction twice.
2.3 side piles shall be nailed on both sides of the road every 10m in the longitudinal direction and every 5m in the longitudinal direction of the curve section.
The initial loose paving coefficient is generally 1.3-1.35.
During transportation or mechanical paving construction, it is likely to concentrate the coarse materials.
In case of rain, the lime fly ash macadam mixture needs to be stored in a large pile.
Lime fly ash macadam shall be evenly paved in the road trough according to the design section and loose paving thickness.
Rolling must be completed at the initial stage of mixture strength formation.
The mixture shall be compacted in sections, and a section of about 5m shall be reserved at the joint without rolling to facilitate connection.
It is strictly forbidden to roll it without timely rolling after paving.
After the lime fly ash macadam base is rolled and formed, the connecting layer and asphalt surface layer shall be built immediately to avoid the direct exposure of the base to the atmosphere for a long time, resulting in loose damage to the base surface and failing to reach the specified strength index for a long time.
During the acceptance, the water content and fly ash content of the mixture shall be emphatically checked.
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During the rolling process, the straight-line section shall be vibrated and rolled from the outer edge of the soil shoulder on both sides to the center (the soil shoulder shall be compacted together), and the flat curved section shall be vibrated and rolled from the outer edge of the inner soil shoulder to the outer edge of the outer soil shoulder (the soil shoulder shall be compacted together).
If it is not remixed, the lime fly ash macadam will be in a loose state and not form a plate.
The height of the soil trough shall exceed the virtual paving height of lime fly ash macadam, and shall be cut vertically to ensure that the soil trough has a certain compactness, so as to prevent the soil trough from being squeezed away during paving or rolling and waste of lime fly ash macadam materials.
2.4 before unloading, the surveyors shall calculate the unloading volume per 10 extension meters of the base course according to the actual paving thickness and cross-sectional area, and submit the data to the materialman, so that the materialman can reasonably and accurately command the unloading to meet the needs of paving construction and avoid the phenomenon of secondary transportation out of the site or too long pushing distance of the bulldozer (the materialman shall check the material volume in time to avoid excessive measurement) 。 At present, lime fly ash macadam mixture is basically the finished product purchased.
The materials shall be loaded, paved and rolled on the same day.
1-2m is reserved in front of the overlapping part for rolling, and the later section shall be mixed and rolled together during construction.
At the same time, the detection of the water content of incoming materials and the water content during construction shall be strengthened, and the water content shall be adjusted by watering or drying in time to make it reach or close to the optimal water content.
If the compacted thickness of each layer is 20cm, the loose paving thickness can be controlled as 26cm.
The sign of basically completed rolling is that there is a thin layer of mortar overflow on the base surface.
During rolling, the formed base course shall be prevented from being loosened.
If the lime fly ash macadam base is seriously soaked in the rain and there is a lot of loss of lime and fly ash, the paved mixture shall be turned up again, mixed with ash, and then paved and rolled.
Therefore, if segregation occurs during loading, unloading and transportation, it shall be re mixed before paving to mix the coarse and fine materials evenly before paving..
Therefore, when feeding, the manufacturer shall timely obtain the product certificate and various test documents related to lime calcium and magnesium content of lime fly ash macadam raw materials, crushed value of macadam, etc.
Horizontal joints shall be in the form of flat joints.
(4) The traffic of lime fly ash macadam shall be completely interrupted before paving, shaping and rolling.
The loose paving coefficient shall be actually measured by the height difference method, that is, 5-10 datum points shall be prepared at the construction site, the elevation of the lower bearing layer shall be measured first, the loose paving elevation of the base point shall be measured accurately after the mixture paving is completed, and the elevation of the selected datum point shall be re measured after the roller rolling is completed, and the loose paving coefficient shall be calculated by the average elevation difference.
Lime fly ash macadam construction process setting out, road shoulder construction, roadbed cleaning, watering, lime fly ash macadam transportation, line hanging, paving, initial compaction, spot patching, final compaction, inspection, watering and curing.
Main construction methods of lime fly ash macadam base 3.1 paving is divided into bulldozer combined with grader, manual paving, paver paving and other methods.
The curing period is 7 days.
When coarse and fine particles are separated, they shall be mixed and then paved.
(1) The paving method of paver is the same as that of cement stabilized gravel.
3.3 treatment of construction joints longitudinal joints are not allowed during the construction of lime fly ash macadam base.
The curing method is watering plastic cloth or watering for moisturizing.
Mechanical paving and square finding method: Bulldozer rough leveling → scraper fine leveling → vibratory roller static pressure for one time → scraper fine leveling → manual leveling and compaction of corners → rolling mechanical paving and manual Square finding method: Bulldozer rough leveling → hanging meter line manual leveling → rolling (6) lime fly ash macadam base, with a maximum compaction thickness of 20cm and a minimum compaction thickness of 10cm.
3.6 common problems and problems encountered (1) separation of coarse and fine materials shall not be allowed during paving, resulting in segregation.
For manual paving, refer to the manual paving process in Article 2.4 (2) B of Chapter V lime soil base construction.
(2) Pave with bulldozer and grader.
According to the actual paving situation, grasp the virtual paving thickness, and evenly pave the mixture according to the design section and loose paving thickness.
After leveling, use 18t vibratory roller to vibrate for 3-4 times, and then use 12-15t roller to stabilize the pressure for 2 times to eliminate wheel traces.
The construction of the second layer shall be carried out immediately after the rolling is completed, so as to facilitate the good combination of the two layers and form a high slab property.
The road sections paved and discharged on the same day must be rolled and leveled on the same day, and finally rolled and formed.
3.4 curing shall be carried out immediately after the completion of curing and rolling.
The surveyors shall review the construction elevation of the datum line and the elevation difference with the loose pavement at any time during the paving process of lime fly ash macadam, so as to avoid errors.
3.2 when rolling the mixture, the moisture content of the mixture is slightly greater than the optimum moisture content.
Full width paving and extended paving section shall be adopted as far as possible to reduce construction joints.
There is no longitudinal joint during construction.
3.5 construction measures for lime fly ash macadam base in winter and rainy season (1) lime fly ash macadam mixture should not be prepared too much at one time, which can ensure the construction needs of the same day.
The paving width shall be at least 15 cm wider on each side according to the design width of the road.
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