Cement stabilized crushed gravel layer and construction method thereof

Abstract

The invention provides a cement stabilized crushed gravel layer and a construction method thereof. The construction method of the cement stabilized crushed gravel layer comprises mixing and stirring raw materials of the cement stabilized crushed gravel layer; transporting the mixed raw materials to a construction site; paving the mixed raw materials on a road surface to be paved on; rolling the paved road surface until the degree of compaction is not lower than design requirements. Practice proves that the cement stabilized crushed gravel layer and the construction method thereof are simple inconstruction, solve the potential quality hazards existing in a layered paving mode to improve the integral performance and quality of base layers, and meanwhile, can greatly improve the efficiency,increase the construction speed from originally 250-300 m per day to 550-600 m per day and further shorten the construction period.

Description

technical field [0001] The invention belongs to the technical field of building construction, in particular, the invention relates to a cement-stabilized crushed gravel layer and a construction method thereof. Background technique [0002] For many years, the base course of my country's high-grade highways has been dominated by semi-rigid base materials. The two most commonly used semi-rigid materials are cement-stabilized crushed gravel and fly ash-stabilized crushed gravel. However, in recent years, due to the gradual shortage of fly ash resources and transportation costs As a result, the cost of fly ash is rising day by day. In addition, compared with cement macadam, the construction process of fly ash macadam is complex and requires many types of raw materials. The finished structure is prone to erosion diseases and low early strength. The requirements for early maintenance are stricter, and the construction cost is not lower than that of cement. gravel. Therefore, more...

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Problems solved by technology

[0004] 1. In pavement design, the base layer is regarded as a whole layer, but core drilling in many projects shows that the cement-stabilized macadam base is actually separated in many places after two constructions, resulting in a discrepancy between the design and the reality, and more importantly Yes, the integrity of the grassroots will be affected, resulting in unfavorable stress on the grassroots;

[0005] 2. Cement-stabilized materials need at least 7 days of curing time to reach the specified strength after compaction. Two-layer construction requires two curing times. Cause quality hazards, and at the same time, cement stabilized materials are not suitable for construction in rainy seasons, or construction is relatively difficult in rainy seasons, which will greatly prolong the construction period;

[0006] 3. Spraying cement slurry on the top surface of the lower layer is likely to cause uneven distribution. If the amount of spraying is too large, there may be a state of interlayer stress, which reduces the bearing capacity of the base layer as a whole structural layer. If the amount of spraying is insufficient, it will not achieve adhesion effect;

[0007] 4. In the process of paving and rolling the upper layer in layered construction, if the roller vibrates improperly, it will cause secondary loosening and damage of the densely rolled lower layer;

[0008] 5. The same process needs to be repeated for two constructions, resulting in an increase in labor and mechanical input

[0013] 4. Due to the large thickness of paving in large-thickness construction, if compaction equipment with large vibration force is used, the lateral force will also be large, so the edges are easy to collapse, and the line shape is also difficult to control. It is not easy to press in place or compact

[0014] 5. It is difficult to detect. The cement-stabilized macadam base mainly adopts the sand filling method, and its detection thickness is limited. There is no research on the detection method of the compactness of the one-time paved thick-layer cement-stabilized macadam structure. It is recommended to use the overall detection Mainly, supplemented by hierarchical detection method for comparative analysis

[0015] Therefore, with the rapid advancement of highway construction in recent years, the traditional layered paving process can no longer meet the demand, and large-thickness one-time paving has become a development trend. In this way, it is necessary to develop a cement stabilized crushed concrete that supports the layered paving process. gravel layer

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