Magnetic powder activation method for magnetic asphalt, magnetic asphalt preparation method, asphalt plate pouring method and waterproof bonding layer paving method

Abstract

The invention discloses a magnetic powder activation method for magnetic asphalt, a magnetic asphalt preparation method, an asphalt plate pouring method and a waterproof bonding layer paving method. Firstly, an ultrasonic device is adopted to achieve effective modification of a silane coupling agent in a base solution on the surface of magnetic powder so as to reduce agglomeration of magnetic powder particles in the preparation process of the magnetic asphalt, the magnetic powder with good dispersity is obtained, then the magnetic powder and the asphalt are mixed at different shearing rates and shearing time, the prepared magnetic asphalt is magnetized, and finally, fibers are embedded into a template for pouring, and the magnetic fiber asphalt plate capable of being used for paving the waterproof bonding layer of the steel bridge deck is prepared. The magnetic powder in the prepared magnetic asphalt is uniform in dispersion and free of agglomeration, the magnetic asphalt has high residual magnetism and coercive force, the bonding effect and deformation compliance between a waterproof bonding layer and a steel plate can be improved, the tensile strength of the magnetic asphalt can be improved through embedding of fibers, the service life is prolonged, and the magnetic fiber asphalt plate is simple in preparation method and low in transportation cost, and the pavement process is simple and convenient, and the method has important construction popularization significance.

Description

technical field [0001] The invention relates to the field of road and bridge engineering steel deck pavement, in particular to a method for magnetic powder activation of magnetic asphalt, preparation of magnetic asphalt, pouring of asphalt slabs and paving of a waterproof adhesive layer. Background technique [0002] The asphalt pavement structure of orthotropic steel bridge deck is different from the general highway asphalt concrete pavement. It is directly laid on the orthotropic steel bridge deck. Under the combined action of natural factors such as loads and earthquakes, especially the influence of bridge structure deformation, its stress and deformation are much more complicated than those of highway pavement or airport pavement, and the working environment is more severe, resulting in the steel bridge Early failure phenomena such as passage of asphalt pavement, rutting, delamination and fatigue cracking are very common. Therefore, the asphalt pavement of orthotropic s...

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Problems solved by technology

However, micro-nano-scale materials have large specific surface energy and large van der Waals force between particles, so they are prone to agglomeration in asphalt, and uneven dispersion will affect the expected modification results and other functions, and the magnetic powder is hydrophilic. Asphalt is a hydrophobic substance. In order to make the two compatible and better exert the size advantages and magnetic properties of micro-nano magnetic powder materials, in addition to surface treatment of micro-nano materials, it is also necessary to use physical shearing technology to accelerate the magnetic powder and asphalt. compatibility

[0004] The design, construction quality control and technology of the steel bridge deck waterproof adhesive layer are the key to ensure its durability. The poor bonding and waterproof effect of the waterproof adhesive layer will lead to slippage between the pavement layer and the bridge deck, and then the vehicle The pavement layer and the bridge deck will be damaged under repeated loads, which will easily cause corrosion of the steel bridge deck

At present, waterproof adhesive layer materials at home and abroad generally have defects such as poor retention, short effectiveness, and high cost. A large number of engineering practices also show that the damage of waterproof adhesive layer has become one of the main types of asphalt pavement diseases on steel bridge decks.

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