Three-slag mixed material with waste gypsum modified flyash

Abstract

The three-slag mixed material with waste gypsum modified flyash consists of flyash with total AlO2 and Al2O3 content not less than 70 % in 5-30 wt%, slaked lime with active calcium oxide and magnesium oxide content at least 30 % in 5-15 wt%, crushed stone in 60-84 wt%, early strengthening agent in 0.5-1 wt%, waste gypsum with SO3 content at least 36 % in 0.5-7.5 wt% and water in 30 wt%. The three-slag mixed material, after being spread, can reach the strength requirement of road base in seven days, has no expansion, and has its antifreezing performance, wet-dry circulation resistance and sulfate corrosion resistance higher than common three-slag mixed material for road base.

Description

technical field [0001] The invention relates to a waste gypsum modified fly ash three-slag mixture. Background technique [0002] At present, the scale of urban construction is getting larger and larger, among which road construction is a pioneer of urban development, because building roads requires a large amount of pavement basic materials, and on the other hand, the fly ash produced by coal-fired boilers is a need to deal with As early as the 1960s, fly ash lime was used as the basic material of the road surface. It has low cost, wide sources, good water stability and certain frost resistance, and is suitable for urban road construction. , but its early strength is low, and the maintenance period after construction is long, resulting in the inability to pave the final asphalt pavement after the base layer is paved, and cannot open traffic. In order to solve the above problems, the existing method is to add chemical additives or cement , However, it brings cost rise and c...

AI Technical Summary

Problems solved by technology

[0002] At present, the scale of urban construction is getting bigger and bigger, among which road construction is a pioneer of urban development, because building roads requires a lot of pavement basic materials, and on the other hand, the fly ash produced by coal-fired boilers is a need to deal with As early as the 1960s, fly ash lime was used as the basic material of the road surface. It has low cost, wide sources, good water stability and certain frost resistance, and is suitable for urban road construction. , but its early strength is low, and the maintenance period after construction is long, which makes it impossible to pave the final asphalt pavement after the base layer is paved, and cannot open traffic. In order to solve the above problems, the existing method is to add chemical additives or cement , but it brings cost rise and cannot be popularized and applied