Rubber bituminous mixture partially using slag as coarse aggregate

Abstract

The invention belongs to the technical field of building materials used in road engineering, particularly relating to a high-strength wear-resisting rubber bituminous mixture partially using slag as coarse aggregate. The mixture comprises slag coarse aggregate, natural stone coarse aggregate, fine aggregate, filler and rubber asphalt, wherein part of coarse aggregate is the slag; part of coarse aggregate is basalt, diabase or limestone; the fine aggregate is limestone, diabase or basalt; the filler is cement or a mixture of limestone mineral powder and slaked lime; and the rubber asphalt is produced by selecting waste cart tire rubber powder with a granularity greater than or equal to 20 meshes and lower than or equal to 40 meshes. The invention fully utilizes the slag, waste tires and other waste materials and turns waste into wealth, thereby effectively relieving environmental pollution caused by the slag and the waste tires. The mixture is a dense grade bituminous mixture using the slag as the coarse aggregate and using the rubber asphalt as a matrix, which has good high-temperature stability, low-temperature crack resistance, normal-temperature fatigue resistance and other performances, and is applicable to various traffic road engineering.

Description

technical field [0001] The invention belongs to the technical field of building materials used in road engineering, and in particular relates to a high-strength wear-resistant rubber asphalt mixture partially using steel slag as coarse aggregate. Background technique [0002] my country is a big country of steel production. Its steel output has been ranked first in the world for many years, and it is shaking ahead of other countries. Steel slag is the main industrial solid waste produced along with the steelmaking process. The discharge of steel slag is nearly 60 million tons per year. The cumulative stacking capacity is nearly 200 million tons. The stacking of steel slag occupies valuable urban land and causes a lot of waste of resources. In addition, due to the free calcium oxide contained in the steel slag, the calcium oxide dissolves in the water after a large amount of rainwater washes away, causing the nearby soil to become alkaline, and the pH value of the nearby wate...

AI Technical Summary

Problems solved by technology

These pavement materials mixed with steel slag have the advantages of low cost, environmental protection and saving, but the surface porosity of steel slag material is large, but its brittleness is relatively poor, and its ability to resist vehicle impact is poor, and the durability of use is difficult to meet the requirements.

Therefore, frequent maintenance is required, which not only increases the cost of use, but also brings inconvenience to the normal passage of the road.

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