Double ash lime screening method and modified cement

Abstract

The invention provides a double ash lime screening method. The screening method is simple to operate and easy to enforce, and all-level aggregates obtained through the screening have obviously reducedwater absorption rate, wear value and crushing value and slightly improved apparent density, and overcome the physical performance defects of too high water absorption rate, wear value and crushing value of double ash lime, so the drying shrinkage cracks of a mixture obtained through applying coarse aggregates to a mixture are reduced, and the compressive strength of the mixture is improved. Theinvention also provides a modified cement. The aggregates with the particle size of (0, 0.075] mm, obtained through the screening method, are used to substitute parts of a cement raw material, so theutilization rate of double ash lime wastes is increased, the use amount of the cement is reduced, and resources are saved; and the use amount of the cement is reduced, so hydration heat generated during the hydration of the cement is reduced.

Description

technical field [0001] The invention relates to the technical field of recovery and utilization of fly ash gravel, in particular to a screening method of fly ash gravel and a modified cement. Background technique [0002] Old fly ash macadam is engineering waste obtained by milling and planing roadbeds made of fly ash macadam. Its recycling can effectively dispose of waste materials, reduce the mining of new materials, save a large amount of sand and gravel materials, and is conducive to environmental protection. , saving engineering investment. [0003] However, the existing technology is mainly to directly recycle the old fly ash crushed stone, and the old fly ash crushed stone aggregate directly recycled cannot effectively solve the physical problems such as high water absorption rate, high wear value, and high pressure crushing value of the old fly ash crushed stone. Defects lead to a large number of performance problems in buildings or structures using old limestone, s...

AI Technical Summary

Problems solved by technology

[0003] However, the existing technology is mainly to directly recycle the old fly ash crushed stone, and the old fly ash crushed stone aggregate directly recycled cannot effectively solve the physical problems such as high water absorption rate, high wear value, and high pressure crushing value of the old fly ash crushed stone. Defects, which lead to a large number of performance problems in buildings or structures using old fly ash crushed stone, such as shrinkage cracking

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