Asphalt modifier, modified asphalt and asphalt mixture

Abstract

The invention belongs to the field of road engineering, and particularly relates to a hyperviscous and high-elastic asphalt modifier applicable to steel bridge deck pavement. The asphalt modifier comprises the following raw materials in parts by weight: 3-10 parts of junked tire rubber powder, 3-10 parts of polyethylene wastes, 3-8 parts of styrene-butadiene-styrene block copolymer, 1-5 parts of styrene-isoprene-styrene block copolymer, 1-5 parts of terpene resin, 5-10 parts of solvent naphtha, and 0.3-0.7 part of alcohol ether carboxylate adhesion agent. In addition, a modified asphalt and amodified asphalt mixture are prepared on the basis of the modifier, the 60 DEG C dynamic viscosity of the modified asphalt prepared by applying the modifier can reach more than 300000Pa.s, and the performance grading reaches PG 88-28; and the asphalt mixture has favorable water stability, higher dynamic modulus, higher track dynamic stability and low temperature failure strain, and can resist complicated mechanics and temperature environment of a steel bridge deck.

Description

technical field [0001] The invention belongs to the field of road engineering, and in particular relates to a high-viscosity and high-elasticity asphalt modifier suitable for steel bridge deck pavement, and the modified asphalt and asphalt mixture prepared by using the modifier. Background technique [0002] The asphalt steel bridge deck pavement structure is a thin layer of asphalt pavement (usually 5-10cm) paved on the steel bridge deck. Sex and other aspects play a vital role. [0003] The temperature and load environment of the steel bridge deck pavement structure is much more complicated than that of the general road surface. Influenced by changes, the extreme temperature in winter can reach below -10°C, and the steel plate on the top surface of the high-temperature steel box girder in summer can reach above 70°C, and the temperature gradient is large, so the high and low temperature performance and temperature fatigue resistance of pavement materials higher performan...

AI Technical Summary

Problems solved by technology

2. The load stress is complex: the steel box girder itself has a large vibration amplitude and deformation, and the deformation is complex. It is required that the pavement and the steel plate have good tracking and deformation capabilities, and can withstand repeated vibration loads without stress fatigue damage; at the same time With heavy load and overloading, the stress and deformation of the steel bridge deck pavement are much more complicated than that of highway pavement or airport pavement. In addition, the combination of extreme temperature makes the steel bridge deck pavement prone to rutting, Potholes, cracks and other early diseases

The advantages of epoxy asphalt are high strength and small deformation, but poor fatigue performance, low early strength, complicated construction technology, long maintenance period and high cost

Other modified asphalt has better fatigue properties than epoxy asphalt, and the construction process is simple, but it is difficult to adapt to the special temperature and stress environment of the bridge deck, and the rigidity, elasticity, toughness, and deformation compliance are significantly insufficient. The small size makes the asphalt mixture prone to rutting under the action of gravity load, pushing and hugging under the action of interfacial shear stress, and the deformation of the steel plate is relatively large under the action of temperature difference, and the deformation compliance of the mixture is poor and prone to cracking. Poor temperature fatigue and load fatigue performance, easy to cause problems such as cracking and falling off

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