Cold-patch bituminous mixture and preparation method thereof

Abstract

The invention belongs to a repair material for road construction and a preparation method thereof and in particular relates to cold-patch bituminous mixture which is characterized by consisting of an aggregate, a filling material, bitumen, a diluent and a reinforcing agent, wherein the mass ratio of the aggregate to the filling material to the bitumen to the diluent to the reinforcing agent is 100:(1-10):(3-6):(0.5-2):(0.1-2). The method has the advantages of simple preparation process and low cost; and the prepared cold-patch bituminous mixture has the characteristics of high strength and long service life. The cold-patch bituminous mixture is especially suitable for repair of road potholes; and the construction is convenient and rapid, dose not close traffic, dose not pollute environment and is not restricted to weather conditions.

Description

technical field [0001] The invention belongs to asphalt pavement repair materials and a preparation method thereof, in particular to a preparation method of asphalt mixture suitable for normal temperature repair construction. Background technique [0002] At present, the asphalt repair materials used in road construction are mainly hot mix asphalt mixture, followed by emulsified asphalt mixture and cold patch asphalt mixture. There are three production methods of hot-mix asphalt mixture: the first one is to use the mixer to produce the finished mixture in the asphalt mixing plant, and transport it to the maintenance site for construction; the second is to use a small mobile mixer in the maintenance site Or the comprehensive maintenance vehicle produces the finished asphalt mixture for construction; the third is when the demand is small, heat the asphalt mixture in the maintenance site and mix the asphalt mixture for construction. The common disadvantages of these three meth...

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Problems solved by technology

The common disadvantages of these three methods are: the production, transportation and construction of hot patched asphalt mixture require high temperature, which is greatly affected by the construction season, and the asphalt mixture is not easy to compact when the temperature is low; at the same time, it will pollute the environment, Affects the physical and mental health of construction workers; requires a longer closure to traffic throughout the repair process

In CN1152591A, the method of diluting asphalt with solvent oil and vegetable oil is disclosed to produce low-temperature asphalt mixture. The operation stability of the prepared asphalt mixture is 1.89~2.83kN, the initial stability is 2.6~6.1kN, and the service stability is 3.4~5.3kN Disclosed in the patent CN1640939A is a kind of cold-mix SBS asphalt liquid repairing material made with diesel oil, gasoline, ethylene glycol, SBS and aging agent, its Marshall stability of the mixture prepared with this asphalt liquid>4.0kN, boiled The asphalt-coated stone area tested by the method is > 2 / 3; in the patent CN1195021C, a kind of heavy oil, petroleum resin, solvent oil, styrene-butadiene rubber, diesel oil, kerosene or gasoline, naphthenic oil and mineral oil and asphalt are disclosed. The obtained cold-patched asphalt binder, but the preparation process of this method is more complicated. It is necessary to prepare prepolymers A, B and C first, and then these three are mixed with aggregate to obtain cold-patched asphalt binder. The cold-patched asphalt binder is measured by Marshall test. The initial stability of the material is > 2.5kN, and the molding stability is > 5.0kN; a kind of cold patching asphalt material composed of petroleum asphalt, polyurethane, resin, antifreeze, diluent and coagulant is disclosed in CN1554708A. The initial stability of the cold patched asphalt mixture is ≥2.5kN, the molding stability is ≥5.0kN, and the area of ​​the asphalt-coated stones tested by the water boiling method is >80%; a kind of diesel oil, kerosene, gasoline and The cold construction asphalt mixture prepared by the naphthenic acid mixed release agent, asphalt and aggregate, the mixture is molded at 0 ℃ to form a Marshall specimen test and its stability is 1.5kN

Looking at all kinds of existing cold-patch asphalt materials, most of them have complicated preparation process, so the cost is high, and because the strength is not high enough, the water peeling resistance and cohesion are not enough, so the water resistance is not good, and the patch is prone to loosening , cracks, pits and other damage, the final service life is short, especially in high temperature environments, the performance is even worse

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