Cement concrete roadway structure suitable for large-tonnage cars and construction method

Abstract

The invention relates to a cement concrete roadway structure suitable for 300-360 tonnage cars and a construction method; the road structure is characterized in that the road structure comprises a tamped decayed rock roadbed, a macadam mixed layer, a cement stabilized macadam connecting layer and a high-strength concrete surface layer from bottom to top; and the construction method comprises the following steps of: a. cleaning and tamping the decayed rock roadbed; b. paving the macadam mixed layer with the thickness being 80-120cm; c. paving the cement stabilized macadam connecting layer with the thickness being 40-60cm, and then compacting; d. paving the high-strength concrete surface layer with the thickness being 40-60cm; and e. maintaining to complete construction. In the invention, compared with the prior art, the cement concrete roadway structure has high road structure strength, good abrasion resistance and long service life, the bending tensile strength of the concrete roadway is improved to more than 9.8MPa from 5MPa of common concrete, and the roadway structure meets structure safety under load action of cars with 300-360 tonnages.

Description

technical field [0001] The invention belongs to the technical field of road cement concrete pavement structure and construction method, and in particular relates to a cement concrete pavement structure and construction method suitable for 300-360 tonnage vehicles. Background technique [0002] In the open-pit mining of mines, in order to improve transportation efficiency and increase production capacity, large-tonnage truck transportation is generally used, especially when the truck load is in the range of 300-360 tons. At present, the fixed roads in stopes and dumps are generally muddy and graded gravel roads, the road surface standard is low, and the transportation cost is relatively high. At present, the maximum load of the cement concrete pavement commonly used by the transportation department is 55 tons of cars, and the structure is three layers of surface layer, connecting layer and base layer, namely: (1) the surface layer is C30-40 cement concrete, with a thickness ...

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Problems solved by technology

(3) Surface layer: C40 steel fiber concrete pouring, the steel fiber specification is 0.2mm×0.3mm×(25~35)mm, the mixing volume ratio is 2%, and the layer thickness is 20cm. The pavement structure has the following deficiencies: (1) The maximum test vehicle load is less than 300 tons, which cannot meet the driving requirements of a 360-ton vehicle load; (2) The cost of the road surface is 1,000 yuan / m2, and it is difficult to promote it on a large scale; (3) Subgrade It is bedrock, and the use surface is narrow; (4) The surface concrete is C40, and the flexural tensile strength is only 4.37Mpa, which is not high-grade concrete

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