Maintenance company in order to let all the construction personnel as soon as possible to master the construction process of roller compacted concrete, in September it was studied and discussed.
Roller compacted concrete is to aggregate and lower the amount of cement and water and adding synthetic mixture and admixture composed of ultra dry hard concrete mixture. The concrete, which is formed by the mechanical crushing of the vibratory roller, has the characteristics of bending resistance, high strength, high density, good durability, saving cement and early strength.
With the continuous development of urban construction, the urban traffic pressure is becoming more and more serious and two main problems of urban road aging, how to reduce the impact of traffic flow in a fast, efficient and high quality of road maintenance is a new requirement of modern municipal maintenance.
Coping maintenance of urban construction at night, rain traffic requirements, we now take milling - leveling subgrade - roller compacted concrete asphalt stalls shop - opening to traffic construction method. Do night closed, open the morning traffic, the impact of the city road traffic to a minimum. The construction points and advantages and disadvantages of roller compacted concrete are introduced in this paper.
One, construction points:
1 milling course after going to clean up, joint to clean loose material especially, try to use shovels to repair 90 degrees.
2 15-20m concrete section, to test the degree of compaction, to ensure that the surface layer thickness of asphalt.
3 strictly control the issue of time, can not let the car waiting for a long time, in order to avoid concrete failure.
4 after the spread of the overlap in the area to patrol, with fine aggregate.
5 with large tonnage vibratory roller roller, the proposed 20T above, in order to ensure that the degree of compaction.
6 when rolling from two sides to the middle of the overlap between the roller, to ensure that the overlap of dense.
7 roller compacted concrete by a large tonnage roller compaction molding. The rubber roller after isolation and maintenance, can not be disturbed, so as not to affect the concrete plate forming.
8 on the rolling after the concrete overlap in the mud to ensure that a series of dense, non seepage.
Two, advantages and disadvantages:
1 construction time is short, the impact of traffic is small.
2 early strength high, after the vibration rolling all kinds of set mix arrangement for the skeleton dense structure, not only saves the cement dosage, but also has very high strength.
3 compared with ordinary water stable slightly higher cost.
4 low temperature construction surface layer should be raised, high temperature construction and surface layer should be cracking, so set the number of expansion joints to inspect the construction season and construction area.
In summary, the roller compacted concrete for the city center main road fast, high level of maintenance has its advantages, but also has its disadvantages, need to be based on the location, traffic flow, maintenance funds. Through this study, we have a further understanding of roller compacted concrete in the future construction, will be strictly in accordance with the requirements of its construction process, careful construction, and create a fine project. (Jin Ye)