Modifier for improving stability of steel slag aggregate and preparation method thereof

Abstract

The invention belongs to the field of road building materials, and discloses a modifier for improving stability of steel slag aggregate and a preparation method thereof, the modifier comprises the following preparation raw materials: ethanol, resin, a silane coupling agent, a curing agent, a curing accelerator, a flexibilizer, a stabilizer, boron nitride, and 2-hydroxy-4-methoxybenzophenone. The modifier is an oil-soluble interface modifier, a layer of micron-level film can be plated on the surface of the steel slag and is compact and uniform, and the prepared modified steel slag is low in water absorption rate and good in volume stability; the obtained modified steel slag is mixed with asphalt, the effect of improving the adhesion performance of the aggregate and the asphalt is achieved through physical and chemical changes, the adhesion level can reach level 5, and the pavement performance of the obtained modified steel slag asphalt mixture is superior to that of an asphalt mixture with stone as the aggregate; and the preparation method is simple and easy to operate and implement.

Description

technical field [0001] The invention relates to the field of road building materials, in particular to a modifier for improving the stability of steel slag aggregates and a preparation method thereof. Background technique [0002] Nowadays, with the continuous development of my country's road industry, the increasing amount of road construction drives the rapid consumption of natural stone, which directly leads to the frequent occurrence of bad phenomena such as the destruction of the mountain ecological environment and the shortage of natural resources. As one of the industrial by-products of the steelmaking industry, steel slag has a low secondary utilization rate, resulting in a large amount of steel slag accumulation, making steel slag an industrial waste that is difficult to handle. In view of the above two problems, it is proposed to use steel slag instead of natural stone as aggregate in asphalt mixture. Steel slag has good angularity, high hardness and high rigidity...

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Problems solved by technology

In the research and actual engineering, it is found that when steel slag is used in asphalt mixture instead of aggregate, the asphalt coated on the surface will peel off under long-term load, and the exposed steel slag will experience volume expansion and other adverse phenomena when it meets water. It is caused by the hydration reaction of free calcium oxide contained in steel slag when it encounters water. The volume expansion will generate expansion stress, which will easily cause the asphalt mixture to crack from the inside, thereby causing damage to the road surface and affecting driving safety; untreated steel slag It replaces the aggregate to prepare asphalt mixture. Since there are tiny pores on the surface of the steel slag, it cannot be fully covered by the asphalt, so the adhesion with the asphalt is poor, and it is easy to cause the asphalt to peel off during use and the steel slag is exposed, and the road surface is oxidized by the steel slag. However, redness, grooves on the road surface and other undesirable phenomena

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