A kind of construction technology of calcium carbide slag fly ash stabilized coal gangue aggregate pavement base

Abstract

The invention discloses a construction process for a road base layer of calcium carbide slag and fly ash to stabilize coal gangue aggregates. 70-80 parts, water 7-14 parts, and papermaking wastewater 10-30 parts. The construction process is as follows: firstly determine the first design mix ratio; then determine the second design mix ratio; calculate the amount of papermaking wastewater; convert the second design mix ratio into the second construction mix ratio; mix the base mixture according to the second construction mix ratio ; Then carry out the transportation, paving and rolling of the base mixture; then spray the papermaking wastewater / water for maintenance; finally remove the insoluble organic matter on the surface of the base. The invention can stimulate the activity of more binders, speed up the reaction speed, improve the early strength and later strength of the pavement base, and can also make the active substances on the aggregate surface participate in the reaction to form cement, and improve the board body and durability of the pavement base. Conducive to the promotion and application of pavement base.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to a construction process for stabilizing coal gangue aggregate pavement bases with calcium 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 roads in my country is mostly semi-rigid base asphalt concrete pavement. The construction of semi-rigid road base consumes a lot of gravel, cement and lime, which causes certain damage to the ecological environment, also causes pollution, and 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 / water, such as carbide slag, fly ash, coal gangue and papermaking wastewater, etc. How to use industrial waste / water to build semi-rigid road base is an urgent need to solve questi...

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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