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Every process flow and every stage of the pavement construction site immediately damage the overall quality of the pavement. Therefore, only by carefully supervising each process flow can we ensure that qualified asphalt concrete pavement can be obtained.
1. Mix asphalt mixture
During the asphalt concrete mixing process, the asphalt concrete will instantly cause unstable quality or uncertainty. All of these are asphalt
Green mixing materials are difficult to ensure the quality of asphalt concrete pavement at standard and mechanically automated assembly line construction sites. For example, the mixing material temperature is uneven or the original ore materials of different specifications is very specific or during the production process?] There are often detection of particulate matter compositions of various ore materials of different specifications, which will change the flow value and porosity, thereby damaging the quality of the road surface. Therefore, we will conduct extraction and screening tests every day and analyze them to make them a basis for detailed guidance on production and production, and immediately adjust the proportion of cold hoppers; and also to regulate the specifications of oscillating screens in the mixing building. Practical experience has proved that circular hole screens operated according to the following specifications are suitable.
1# sieve = larger particle size than cooperative operation (1?2) mm
2# sieve = (combined operation with larger particle size?5mm)/2 (1?2)mm
3# sieve = 5 mm (1?2) mm
4# sieve=3 mm
In this way, moderate adjustment can be made. How to choose a round hole screen with asphalt concrete with round hole screen as 33, 16, 6, and 3. The actual effect is good. In order to maintain the quality of asphalt concrete mixture, our professional testing engineering supervision workers carried out inspections during the daily formation process, and immediately corrected and solved the short answer questions.
2. Rolling processing technology
Crushing is the key process for forming asphalt surfaces, a key step to ensure the quality of the pavement so that its physical and mechanical characteristics and effect characteristics meet the design rules, and is also the ultimate processing process for the construction of asphalt road surfaces. Here we are here to understand that our engineering supervision rules are implemented at all levels, and apprenticeships are corrected immediately if they find that they are not promptly. Other rules are under the following aspects:
1. After the rolling is completed, the pavement often produces edge-selected gaps, which will greatly damage the reliability of the asphalt concrete pavement.
Therefore, appropriate inspection is carried out on the rolling temperature of the initial pressure and final pressure to ensure that the final pressure is within the scope of the design plan rules.
2. The oscillating roller must not start and brake pedal quickly on the newly paved surface layer. The driver with skilled rules and experience in operation
Practical operation;
3. Too much watering causes the surface of the asphalt mixture to cool too quickly, causing the surface of the asphalt concrete to crack. Therefore, watering on the wheel of the oscillating roller should be strictly controlled. It is only necessary to not stick the wheel, which will damage the actual effect of the oscillating roller on the asphalt mixture rubbing.
4. Before using the tire method, check whether the damage and working pressure of each tire are the same before oscillating the road roller, so as to prevent the hardness and softness of each tire, which will damage the horizontal plane of the overall surface layer.
3. The asphalt penetration integrated surface layer should be constructed according to the following procedures and rules:
1. Construction plan and curbs.
2. Organize the grassroots level in rural areas.
3. Spray permeable oil or sticky layer to dip. The penetration pavement with a thickness of 4-5 cm should be sprayed with permeable oil or sticky layer to remove.
4. Spread the main layer of sand and gravel. When paving sand and gravel, the concentration of particle sizes should be avoided, and the loose laying thickness should be checked. Cars should be prohibited from driving on paved sand and gravel layers.
5. Crush. After the main layer of sand and gravel is spread, the initial pressure should be first carried out using an oscillating roller of 6-8 tons. The speed should be 2 kilometers per hour. The crushing should be gradually adjusted from the edge of the road to the road management center. Each wheel track overlaps to 30 cm, and then the road management center should be pressed from the other side in the same way. After rolling, the road arch and vertical inclination should be detected. When there is any deviation from the rules, it should be flattened and then pressed. It is advisable to roll it twice to make the sand and gravel basically stable and there is no obvious change. Then use a 10-12-ton oscillation roller (a thin and thick penetration-type road surface can be rolled with a 12-15-ton oscillation roller). Each wheel trace should overlap by more than 1/2 and should be rolled 4-6 times until the main layer of sand and gravel is tightly embedded and there is no obvious wheel trace to be cut off.
4. The mixing of asphalt concrete should comply with the following rules:
1. Strictly control the use of various minerals and asphalt according to the seasoning sheet.
2. Operate the heating temperature of various raw materials and asphalt concrete.
3. The mixed asphalt concrete is uniform and has no spots, no small and small materials to separate out and clump into lumps.
4. Each class takes samples for asphalt concrete characteristics, ore cooperation ratio composition and asphalt usage tests.
5. At the end of each shift mixing, organize the mixing machinery and equipment to connect the bitumen in the pipeline. Keep all kinds of check records, asphalt concrete that does not meet the required technical standards should be prohibited from the original factory.
V. Sampling and Testing
Construction site tests often produce test results that are far apart from the details, so the following aspects are guaranteed according to the rules:
1. Asphalt concrete is sampled according to the statistical method to measure the asphalt mixture cooperation ratio of asphalt mixture. The sampling address of the asphalt mixture is next to the hot mixing machine and equipment where the asphalt is mixed. The asphalt composition test should be sampled from the paved mixing material behind the paver and in front of the oscillating road roller. The density test requires taking the test pieces from the pressed road concrete, and obtaining the test results. If there are any errors, immediately announce the mixing building or paving site, and make corresponding countermeasures.
2. Take the sample every 500T of mixing material samples, and the fruit will be reviewed by us.
3. When the construction company conducts tests on various indicator values, it will conduct parallel surface tests to make the purpose of checking them.
6. Paving quality
The quality of pavement is immediately damaged by the overall quality of the pavement, so this becomes the asphalt concrete of our project supervision
The key points in the entire process of pavement construction. In addition to the characteristics of the mechanical equipment themselves, the quality of paving operations also lies in the sustainability, reliability, uniformity of paving, and the balanced water of feeding. Therefore, there are many problems arising from this link, such as:
1. The uneven thickness of asphalt concrete pavement is always objective and realistic, which will form different compaction effects formed by different thicknesses under the same loose paving coefficient, thereby damaging the pavement plane. Therefore, in addition to improving the planarity and elevation of rural grassroots, supervision of the planarity and elevation of the lower layer of digging pavement should also be improved, so that there is a certain compensation, and strictly control it layer by layer up to the upper layer.
In extraordinary circumstances, to ensure the thickness of the road surface, appropriate adjustment of the elevation is chosen to ensure the thickness of the road surface solid layer.
2. After the paver is opened, a double slope will be generated at a distance, which will cause great damage to the flatness of the road surface. According to the continuous certification, the scale of the temperature difference between the screed itself and the heating temperature of the screed. Therefore, when the temperature of the screed is not less than 80°C, level it with a level on the ground, and clearly the thickness of the pad under the screed (the thickness of the pad = loose thickness of the screed heated arches and high-rise residential errors in rural grassroots, the general rule has five support points). Especially when paving the whole pair, the arch should be adjusted to the same inclination before paving and immediately adjust it. Especially before paving, it should be checked and adjusted to avoid the high, medium and low-end road width at the secondary joints.
3. The spiral feeder and paving movement rate of the paver are not matched, which causes too much or too little material to run in the paving room, resulting in a folding size of the mixing material in the screed computer. We regularly use the height and width ratio of the mixing material pile in the spiral paving room to be flush or slightly higher than the pivot axis of the spiral paver. In particular, the spiral paver cannot get high speed.
4. The movement rate of the paver is uneven, which causes the paving rate to be uneven, and wave patterns appear on the surface of the digging pavement, which seriously damages the flatness and density. Therefore, we rule that it should ensure a speed of 3ˉ4 meters/min to minimize shutdown. In case of shutdown, the paver screed should be clamped tightly to avoid moving downwards. There is no need to exceed the extreme clock when the temperature is above 10°C. When the continuous ?r interval exceeds three extraordinary minutes or the mixture is less than 100°C, the joint should be re-connected according to the method of cold joints. Before paving, you should ensure that three vehicles of materials are waiting to be laid to avoid shutdown and wave patterns as much as possible.
5. Regarding the reliability of pavers moving, the following types of problems often arise:
a. The powder removed from the paver crawler driving network due to pouring material was not immediately eliminated, resulting in gene mutations in the paving thickness. Therefore, during the entire process of construction, the construction team is urged to patrol anytime and anywhere to avoid such situations.
b. The transport vehicle bumps into the paver when turning, causing the paver to move forward in distortion, causing the road surface to become convex. We rule that during the continuous paver, the feeding machine should stop at 10ˉ750px in front of the paver and hang a neutral gear to promote slow forward with the help of the paver; 6. At the construction site of the middle and upper floors, the ground leveling beam (pull) has a large tortuous stiffness, a small deflection value, and many floor-standing wheels and ice sleds, which are useful for the distribution of gross weights and good walking reliability. Therefore, we must use the ground leveling beam, which has a very good practical effect on improving the flatness and thickness of the road surface.
7. Check the use of new technologies
1. Use of new technology for road deflection value inspection
The inspection of pavement deflection value is a key indicator for accurate measurement of compressive strength of soft road surfaces in my country. The pavement deflection value refers to the total vertical deformation or vertical rebound deformation value formed by the surface clearance part of the pavement surface under the required standard axle loading function. New assay
8. Solve the joints
There are two situations: work breakage and connection head with the structure at the joints. The location of the joints will gather adverse conditions that damage the flatness of the road surface. The quality of the road is very harmful to the quality of the road surface. In order to better improve the quality rules at the joints, the following countermeasures must be used:
1. Use a seam cutter to cut its cross section to ensure that the cross section at the joint is a positive drooping surface.
2. The cutting joints must be checked based on the three-meter scale, and the joints will be removed due to the previous crushing and collapse. In order to reduce the length of the removal part, the paver sensational tamp should always be maintained until the paving ends.
3. During rolling, the oscillating roller is gradually connected from frozen to heat, and is constantly filled with coarse materials until it is checked with a three-meter scale to ensure the required standard cut-off, so that it can be gradually rolled vertically.
4. The head end of the connecting head with the structure is the same as the cold joint. The terminal equipment section needs to be laid with a line to level it. The thick material is filled and rolled while rolling. It must be done in a practical manner by skilled workers and carried out in a short period of time to ensure the rolling temperature.
5. Before connecting the head with the structure, you must carefully check whether the rural grassroots at the joint are leveled, whether the crushing is compact, and how the agglomeration level is. From the high-incidence surface, ensure the flatness at the junction of hardness and softness.
With the rapid development trend of expressways today, asphalt concrete pavement has been widely marketed and has produced complete sets of equipment technology with pavement structure, raw materials, engineering construction and inspection as the key points. The technical strength of engineering construction has been greatly improved. The technical and quality of some asphalt concrete pavement has generally reached or is close to the international excellent level. However, the quality of asphalt concrete pavement is restrained and damaged by various factors such as operators, raw materials, machinery and equipment, technical processing technology, level, natural environment, and the diversity, systematization and correlation of asphalt pavement construction processes. Therefore, the necessary supervision system is very important. As engineering supervision, construction companies should strictly carry out appropriate and orderly construction projects in accordance with the approved construction plan design plan and its standard rules.