High-strength steel fiber concrete pavement structure for high-tonnage automobile and construction method

Abstract

The invention relates to a high-strength steel fiber concrete pavement structure for high-tonnage automobiles and a construction method. The high-strength steel fiber concrete pavement structure is characterized in that the high-strength steel fiber concrete pavement structure sequentially comprises a weathered rock subgrade, a subgrade reinforcing grout, a cement-stabilized gravel connecting layer and a steel fiber concrete surface layer from bottom to top. The construction method of the high-strength steel fiber concrete pavement structure comprises the steps of: a) cleaning and tamping the weathered rock subgrade; b) using the subgrade reinforcing grout for reinforcing the weathered rock subgrade, wherein the thickness is 5-10cm and the embedding depth is 2-3cm; c) spreading the cement-stabilized gravel connecting layer, wherein the thickness is 40-60cm, and then tamping; d) spreading the steel fiber concrete surface layer, wherein the thickness is 40-60cm; and e) curing and obtaining the finished product. By using the steel fiber concrete pavement structure for replacing the original clay-bound and graded gravel pavement, the expansion of micro-cracks in concrete and the formation of macro-cracks are effectively avoided, the tensile strength, the bending resistance, the impact resistance and the fatigue resistance of the concrete are obviously improved and the ductility is better.

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 high-strength steel 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 concret...

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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 / m2, and it is difficult to promote on a large scale; (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 high-grade concrete

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