Method for improving water stability of porous polyurethane mixture

Abstract

The invention discloses a method for improving the water stability of a porous polyurethane mixture. The method comprises: 1) testing the performance parameters of a one-component polyurethane adhesive, and selecting the adhesive; 2) determining the type and the grading of an aggregate, and performing mixing ratio design; 3) modifying the aggregate in the step 2 with different kinds of silane coupling agents; 4) mixing different types of the modified aggregates obtained in the step 3 and the adhesive obtained in the step 1) according to the grading requirements to prepare a Marshall specimen, and carrying out a freeze-thaw split test; and 5) comparing the experimental results in the step 4), and determining the method for improving the water stability of the porous polyurethane mixture by using the silane coupling agent.

Description

technical field [0001] The invention belongs to the technical field of preparation of road building materials, in particular to a method for improving the water stability of porous polyurethane mixtures. Background technique [0002] At present, polyurethane mixtures are mainly used for road quick repair materials and pavements with relatively low traffic pressure such as parks, residential areas, business district squares and sidewalks, and are rarely used in porous and permeable pavement materials. In recent years, in order to solve the problems of asphalt-based permeable pavement materials such as fatigue resistance, poor aging resistance, easy clogging of pores, and asphalt smoke pollution caused by high-temperature heating during construction, domestic and foreign scholars have conducted research on porous permeable pavement materials and found that their water stability Poor, limiting its application on the road. [0003] Laboratory experiments found that the dynamic ...

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Problems solved by technology

However, its water stability is poor, and its Marshall stability and freeze-thaw splitting tensile strength ratio after immersion in water are lower than those of OGFC.

[0004] Wang Huoming, Li Rukai and others found that the hydrothermal stability of porous polyurethane mixture was poor, and proposed that it can be improved by changing the aggregate particle size and increasing the amount of adhesive.

[0005] Cong Lin et al. found that the Marshall stability of the porous polyurethane mixture was less than 30% after soaking in water, and the water stability was poor.

[0007] To sum up, domestic researchers have found that the water stability of porous polyurethane mixture is poor, but no improvement research has been conducted on it.

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