A method for evaluating the durability of snow melting effect of snow melting asphalt mixture

Abstract

The invention discloses a method for evaluating snow-melting effect durability of a snow-melting asphalt mixture. The method comprises the steps: firstly, forming a rutting plate test piece, measuring the length and width of the test piece, carrying out survey so as to obtain local average annual rainfall, and calculating the volume of rainwater falling in the area of the rutting plate in a year; then, measuring the volume of water flowing out of a sprayer in a certain time by a measuring cylinder, and carrying out calculation so as to obtain the flow velocity of the sprayer; then, carrying out simulated rain trails, sprinkling water in the sprayer to the rutting plate so as to uniformly scour the surface of the rutting plate, collecting scouring rainwater with a glass at intervals of 5 minutes, measuring electric conductivity of the collected scouring rainwater, and calculating the effective age of the snow-melting effect durability of the snow-melting asphalt mixture according to scouring time corresponding to required minimal electric conductivity. According to the method, the snow-melting durability of the snow-melting asphalt mixture can be accurately and conveniently evaluated, and important help is provided for quantitative evaluation on snow-melting durability of snow-melting asphalt pavements.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and in particular relates to a method for evaluating the durability of the snow-melting effect of a snow-melting asphalt mixture. Background technique [0002] Three-quarters of my country's land belongs to winter snow-covered areas, and some areas have snow-covered periods as long as 3 to 4 months. Snowfall and icing will directly lead to the decline of the anti-skid performance of the road surface, causing the brakes of the car to fail and the direction to be out of control, thus easily causing traffic accidents. Relevant data show that the adhesion coefficient of dry asphalt pavement is about 0.6, while the adhesion coefficient of snow-covered pavement is 0.2, and the adhesion coefficient of icy road is 0.15, which is reduced to 1 / 3 and 1 / 4 of dry asphalt pavement. Therefore, on ice and snow roads, cars are prone to skidding and deviation, and the braking distance is significantly pr...

AI Technical Summary

Problems solved by technology

(1) The most common qualitative evaluation method is to directly compare the ice-melting snow pavement with the ordinary asphalt pavement after snowing in winter. This method needs to pave the pavement with antifreeze asphalt mixture, which is costly and not suitable for the experimental research stage (2) After freezing, observe the scratch phenomenon on the surface of the test piece to evaluate the effect of melting ice and snow. This method can intuitively feel the effect of melting ice and snow on the sample added with antifreeze, but it cannot accurately evaluate the effect of melting ice and snow on the road surface ; (3) Deicing test is carried out by applying static load to the square disc specimen. This method uses static pressure head to simulate the actual road conditions poorly. Moreover, this method is only suitable for analyzing the ice breaking effect under the condition of road surface icing. (4) The so-called road surface exposure rate refers to the ratio of the exposed road surface area (anti-freezing road surface area) to the area of ​​the detection section within the range of vehicle driving, and the road surface exposure rate is only applicable to outdoor tests. It is not possible to use this indicator to evaluate the effect of melting ice and snow indoors.

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