Construction process of pavement base layer made of carbide slag and fly ash stabilized coal gangue aggregate

Abstract

The invention discloses a construction process of a pavement base layer made of carbide slag and fly ash stabilized coal gangue aggregate. The pavement base layer comprises the following materials in parts by weight: 5-15 parts of carbide slag, 10-20 parts of fly ash, 70-80 parts of coal gangue aggregate, 7-14 parts of water and 10-30 parts of papermaking wastewater. The construction process comprises the following steps: firstly, determining a first design mix proportion; determining a second design mix proportion; calculating the consumption of papermaking wastewater; converting the second design mix proportion into a second construction mix proportion; mixing the base layer mixture according to a second construction mix proportion; then transporting, paving and rolling the base layer mixture; spraying papermaking wastewater/water for maintenance; and finally removing insoluble organic matters on the surface of the base layer. According to the invention, the activity of more binding materials can be stimulated, the reaction speed is accelerated, the early strength and the later strength of the pavement base are improved, active substances on the surface of the aggregate can participate in reaction to form a cement, and the plate body property and the durability of the pavement base are improved. The popularization and application of the pavement base are facilitated.

Description

technical field [0001] The invention relates to the technical field of road engineering, and more specifically relates to a construction technique for stabilizing a coal gangue aggregate pavement base with carbide slag and fly ash. Background technique [0002] With the rapid development of my country's economy, road construction has also developed rapidly for decades, and will continue to develop rapidly. The pavement structure of my country's roads is mostly semi-rigid base asphalt concrete pavement. The construction of semi-rigid pavement base consumes a lot of gravel, cement and lime, which causes certain damage to the ecological environment and also leads to pollution. At the same time, the price is high. On the other hand, the rapid development of industry has discharged a large amount of industrial waste residue / water, such as carbide slag, fly ash, coal gangue and papermaking wastewater, etc. How to use industrial waste residue / water to build semi-rigid pavement base...

AI Technical Summary

Problems solved by technology

[0005] However, the early strength of carbide slag fly ash stabilized coal gangue aggregate pavement base is low, the 7d unconfined compressive strength often cannot meet the specification requirements, and the long-term strength is also low, especially at the lower temperature of 5°C-20°C When , the strength formation speed is slower, which limits its popularization and application

At present, there is a plan to add cement to the mixture of calcium carbide slag fly ash stabilized coal gangue aggregate pavement base. It can improve the early strength of the pavement base, but it cannot improve the long-term strength. In addition, due to the use of cement, the mixture is required Mixing, transportation, paving, and rolling until the cement is qualified must be completed before the initial setting of the cement. Engineering practice shows that this is often impossible, which increases the difficulty of construction.

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