Polyurethane grouting material for treating diseases of semi-rigid base layer of asphalt pavement

Abstract

The invention discloses a polyurethane grouting material for treating diseases of a semi-rigid base of an asphalt pavement, which comprises a component A and a component B in a volume ratio of (0.9-1.1): 1, wherein the component A is polymethylene polyphenyl isocyanate; the component B is prepared from the following raw materials in parts by weight: 100 parts of polyether polyol, 0.5-3.0 parts of a catalyst, 1-15 parts of a foaming agent, 1-3 parts of a foam stabilizer, 0.2-2 part of water, 1-4 parts of a hydrolysis stabilizer, 2-20 parts of a diluent and 1-12 parts of a cross-linking agent. A high-pressure grouting machine is adopted to inject a polyurethane grouting material for treating asphalt pavement semi-rigid base layer diseases into a pavement base layer, accumulated water in the deep layer of the pavement can be drained, void and incompactness of the semi-rigid base layer are filled, and the polyurethane grouting material has a good sealing effect on deep cracks; through the physical and chemical synergistic effect of the raw materials, the grouting material has excellent water insensitivity, the bearing capacity and durability of the grouting material in a water-rich environment of a semi-rigid base layer are greatly improved, and the grouting material has good economic and social benefits.

Description

technical field [0001] The invention belongs to the field of road engineering materials, and in particular relates to a polyurethane grouting material for treating semi-rigid base disease of asphalt pavement. Background technique [0002] According to statistics, as of the end of 2019, the total mileage of national highways was 5,012,500 kilometers, of which 149,600 kilometers were expressways, and more than 90% of expressways were semi-rigid asphalt pavements. The semi-rigid base has high strength and rigidity and poor deformation ability, which will inevitably lead to shrinkage cracking, which will lead to reflection cracks in the asphalt surface in the later stage. Once the reflective cracks are formed, rainwater will seep down to the base and roadbed along the cracks. Under the action of water and vehicle loads, mud pumping, water accumulation in the road bed, and voids between layers will occur, thereby reducing the bearing capacity of the base and roadbed, and causing...

AI Technical Summary

Problems solved by technology

[0005] Chinese patent CN201510970563.8 authorizes a kind of high polymer grouting material for airport runway base disease treatment. This invention has good performance advantages of water resistance, oil resistance and heat resistance, but the preparation process of polyurethane prepolymer used in this invention is relatively complicated. , the material price is relatively high

[0006] Chinese patent CN201610908495.7 authorizes a water-insensitive polyurethane grouting material. Through the physical and chemical synergy between raw materials, the grouting material has excellent water insensitivity, which greatly improves its bearing capacity in water-rich environments. and durability, but the polyurethane material produced by the polyester polyol used in this invention has poor hydrolysis resistance, and the durability of the material used for grass-roots disease treatment is insufficient

[0007] Considering that there is often water accumulation in the interior of the base or in the void below, ordinary polyurethane grouting materials are sensitive to water during grouting construction, and their properties (such as density, compressive strength, etc.) are greatly deteriorated , reducing its load carrying capacity and durability