Milling-free in-situ cold recycled asphalt pavement maintenance method

Abstract

The invention relates to the technical field of asphalt pavement maintenance, in particular to a milling-free in-situ cold recycled asphalt pavement maintenance method. The method comprises the following steps of selecting an asphalt reduction regenerant prepared by refining naphthenic crude oil, and uniformly mixing and stirring the asphalt reduction regenerant with water in proportion, pouring the uniformly stirred asphalt reduction regenerant into a special spraying vehicle storage tank, after the special spraying vehicle enters the field, starting a stirrer in a storage tank of the specialspraying vehicle, and continuously stirring for 30 minutes, turning off a stirrer power supply, setting a spraying width according to the width of a construction pavement, selecting a construction advancing direction, and adjusting the position of the special spraying vehicle, according to the determined spraying amount and spraying width of the asphalt reduction regenerant, determining the operation speed per hour of the special spraying vehicle, the ground clearance of a spraying pipe, the spraying pressure, the spraying flow angle and the overlapping width of adjacent spraying belts, carrying out trial spraying on the asphalt pavement for a certain length, so that the asphalt reduction regenerant after trial spraying is uniformly distributed on the pavement, and after trial spraying iscompleted and no error is confirmed, conducting formal spraying construction.

Description

technical field [0001] The invention relates to the technical field of asphalt pavement maintenance, in particular to an in-situ cold recycled asphalt pavement maintenance method without milling. Background technique [0002] At present, asphalt pavement recycling technologies include plant-mix hot regeneration, in-situ hot regeneration, plant-mix cold regeneration, in-situ cold regeneration, and full-depth regeneration. [0003] According to the scale of the project and the difficulty of the technology, the maintenance and repair operations of asphalt pavement are divided into five categories: daily inspection and inspection, minor repair maintenance, medium repair, major repair, reconstruction and special maintenance projects. It is a maintenance concept that emphasizes maintenance and neglects prevention. The preventive maintenance technologies currently used mainly include slurry seals, micro-surfacing, gravel seals, composite seals, thin hot-mix asphalt concrete overlay...

AI Technical Summary

Problems solved by technology

The construction cost is lower than that of traditional hot asphalt overlays (generally about 50%), but it does not improve the bearing capacity of the pavement structure; the slurry seal, although it can solve the aging of the asphalt pavement surface, poor oil, lower friction coefficient, road surface seepage and slight cracks, but does not contribute to the structural strength of the pavement, and is ineffective for large fatigue cracks or severe rutting. After the implementation, the road needs to be closed for 2 hours or longer; synchronous gravel seal, although it has good waterproof performance and high Good skid resistance, wear resistance and durability. The cost of a single-layer synchronous crushed stone seal is about 50% of that of a 3cm hot-mix overlay, which is economical and suitable for paving in areas operating in low or high temperatures and harsh climates , but the treatment effect on rutting and other diseases is not good; although the super-sticky wear layer has high abrasion resistance, high adhesion, high water resistance, high stress absorption and stress diffusion capabilities, it effectively improves the tensile and shear resistance of the wear layer. , compressive and impact strength, can effectively inhibit the generation of low-temperature shrinkage cracks on asphalt roads, and shorten the time for opening traffic, but the construction difficulty is relatively high

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