A kind of anti-segregation skeleton compact cement-stabilized gravel mixture, its application and paving method

Abstract

The invention discloses an anti-segregation skeleton compactness cement-stabilized macadam mixture and application and paving methods thereof, and belongs to the field of road engineering. According to the grading range of the mixture, the percentage of mineral aggregate with the particle size of 31.5 mm is 100%, the percentage of mineral aggregate with the particle size of 26.5 mm is 90%-100%, the percentage of mineral aggregate with the particle size of 19 mm is 76%-86%, the percentage of mineral aggregate with the particle size of 9.5 mm is 43%-55%, the percentage of mineral aggregate with the particle size of 4.75 mm is 26%-36%, and the percentage of mineral aggregate with the particle size of 0.075 mm is 0%-4.5%; the skeleton structure can be guaranteed, and segregation of the mixture is reduced. According to the paving method, two-layer continuous paving and prime coat curing are adopted, all layers can better form a whole, and high application and popularization value is achieved.

Description

technical field [0001] The invention relates to the field of road engineering, in particular to a cement-stabilized macadam mixture with anti-segregation skeleton compactness, its application and a paving method. Background technique [0002] Cement-stabilized gravel mixture is currently a commonly used type of semi-rigid base-grade mixture. The gradation range given in the current design code is shown in the table below. [0003] [0004] The construction method is paving in layers, rolling and forming, covering with geotextiles and sprinkling water for health preservation. After the first layer of health preservation, the second layer of paving is carried out; after the second layer of health preservation period is reached, the permeable layer of emulsified asphalt is spread. [0005] In practical application, the two types of gradation given in the design specification are based on engineering practice: the skeleton strength of the suspension-dense mixture is low, and ...

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Problems solved by technology

[0005] In practical application, the two types of gradation given in the design specification are based on engineering practice: the skeleton strength of the suspension-dense mixture is low, and to increase the strength of the mixture, the amount of cement must be increased, and the increase in cement use will cause The increase in project cost, and if the cement metering is not increased, the strength of the mixture will not reach the design strength, which will easily cause fatigue damage; the segregation in the construction process of the dense skeleton type is more serious, and once the mixture segregates, it will cause uneven compaction property, resulting in uneven strength of the pavement, which is a major hidden danger of pavement disease in the later stage, and the anti-scouring ability of the mixture is insufficient, causing water damage to the pavement

[0006] Furthermore, the construction method of the cement-stabilized gravel base in the prior art will result in the delamination of the upper and lower layers, causing the bending and tensile stress at the bottom of the layer to be borne by the thin layer, which is contrary to the original intention of the design of the layered continuous system of the pavement, and the upper layer Spread emulsified asphalt after the curing period is reached. At this time, the strength has been formed and the surface is relatively dense. The emulsified asphalt is not easy to penetrate into the mixture, which is not conducive to the connection with the upper layer of asphalt.

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