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

Abstract

The invention relates to a polypropylene fiber concrete roadway structure suitable for large-tonnage cars and a construction method; the road structure is characterized in that the road structure comprises a decayed rock roadbed, a roadbed strengthening grouting material, a lean concrete layer and a polypropylene fiber 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. strengthening the decayed rock roadbed by adopting the roadbed strengthening grouting material, wherein the thickness of the grouting material is 5-10cm, and the embedded depth of the grouting material is 2-3cm; c. paving the lean concrete layer with the thickness being 40-60cm, and then compacting; d. paving the polypropylene fiber concrete surface layer with the thickness being 40-60cm; and e. maintaining to complete construction. In the invention, the polypropylene fiber concrete surface layer is adopted to replace a mud-combined graded crushed rock roadway to effectively improve the bending tensile strength of the roadway, besides, the polypropylene fiber concrete roadway structure has high elongation ultimate and good alkali resistance, and overcomes the disadvantages of low tensile strength, low elongation ultimate and brittleness of cement, mortar and concrete.

Description

technical field [0001] The invention belongs to the technical field of highway cement concrete pavement structure and construction method, and in particular relates to a polypropylene fiber concrete pavement structure and construction method suitable for large-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, ...

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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 volume ratio of the volume is 2%, and the thickness of the layer 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 / m 2 , large-scale promotion is difficult; (3) The subgrade 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 a high-grade concrete

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