Composite cement using carbide slag and fly ash as admixture

Abstract

The invention provides a composite cement using carbide slag and fly ash as admixture, wherein the composite cement comprises the following raw materials in percentage by weight: 5-10% of dry carbideslag, 20% of fly ash, 10% of mineral slag, 55-60% of portland cement clinker and 5% of gypsum, and the sum of the weight percentage of each component is 100 percent. At first, that carbide slag is dried and crushed, then the dry carbide slag, the fly ash, the portland cement clinker, the mineral slag and the gypsum are weighed according to the formula, and the composite cement can be prepared by sequentially adding the raw materials into a mill and grinding together. As that carbide slag and the fly ash are used as admixtures to prepare the composite cement, the waste is changed into treasure,not only environmental pollution is reduced, but also the preparation process of the product is simple, the production cost is low, the early strength of the prepared composite cement is high, and the composite cement has good social and economic benefit.

Description

technical field [0001] The invention relates to the comprehensive utilization of solid waste in the field of ecological environment materials, and more specifically relates to a composite cement using calcium carbide slag and fly ash as mixed materials. Background technique [0002] Cement is a powdery hydraulic cementitious material that can be mixed with water to form a plastic slurry, which can cement sand, stone and other materials, and can be hardened in the air and hardened in water. There are many types of cement, which are divided into three categories: general cement, special cement and special cement. Among them, composite cement is one of the varieties of general cement. Cement has better plasticity after mixing with water, and higher strength can be obtained after cement hardening, and the durability of cement is better. Therefore, cement is not only widely used in industrial and civil buildings, but also widely used in transportation, urban construction, agricu...

AI Technical Summary

Problems solved by technology

In recent years, some people have carried out research on the use of calcium carbide slag as raw material and high-temperature calcination to prepare cement, but the production process is complicated, the fuel consumption and heat consumption are high, and the exhaust gas emission is large, which increases the production cost.

[0005] Fly ash refers to the material that is discharged from the flue and collected by the dust collector after the pulverized coal is burned in the boiler in the coal-fired power plant. It is one of the by-products of coal combustion with the largest emission in my country at present. 7000cm 2 / g, the main component is SiO 2 , Al 2 o 3 and Fe 2 o 3 , it is a typical pozzolanic material with potential activity. Fly ash is used as cement and concrete admixture in the production of cement, sintered bricks and other new building materials, as well as in the fields of civil engineering, water conservancy and marine engineering. The main way to utilize external fly ash, so far there is no report on the use of calcium carbide slag and fly ash as admixture materials to prepare composite cement