Red-mud-fly-ash high-strength heat-preservation building block based on alkali excitation and preparation method thereof

Abstract

The invention discloses a red-mud-fly-ash high-strength heat-preservation building block based on alkali excitation. Industrial waste fly ash and red mud serve as main raw materials, cement and quicklime serve as auxiliary materials, and fly-ash pottery sand or shale pottery sand serve as heat-preservation materials. The building block is prepared from, by mass, 18-40% of red mud, 18-30% of fly ash, 25-40% of pottery sand, 3-8% of cement, 3-10% of lime, 1-3% of straw fibers and 0.5-2% of early strength agents, the water content is 10-15%, aging is conducted for 8-36 hours, and molding is conducted under the pressure of 40 MPa; the building block is prepared by the steps of drying, grinding, weighing, mixing of the auxiliary materials, compression molding, standard maintenance and natural curing. The red-mud-fly-ash high-strength heat-preservation building block based on the alkali excitation has the advantages of being simple in molding process, capable of having a reaction and being cured quickly at room temperature, and free from sintering and stream-pressure, products of the building block are high in compressive strength and anti-dry-shrinkage performance and good in impermeability, and can be stored for a long time without scumming phenomena. A large amount of industrial waste can be utilized, the energy and resources are saved, and the cost and energy consumption are low.

Description

technical field [0001] The invention belongs to the field of building material wall blocks, and specifically refers to a red mud-fly ash high-strength thermal insulation block based on alkali excitation and a preparation method thereof. Background technique [0002] Fly ash is a large amount of industrial waste discharged from thermal power generation. my country's annual discharge of fly ash is about 200 million tons, and the annual cost of directly processing fly ash in my country reaches several billion yuan. With the increasingly in-depth research on fly ash, people are gradually realizing that fly ash is no longer an industrial waste residue, but an available resource. Fly ash is mainly used for backfilling and road construction, etc. It can only replace part of cement in a small amount when used in building materials. Only about 20% of the total amount of fly ash is used in building materials. Compared with other industrial wastes, the amount of fly ash Utilization ra...

AI Technical Summary

Problems solved by technology

At present, most alumina plants at home and abroad transport the red mud to the storage yard, and build a dam for wet storage. This method will easily cause a large amount of waste lye to penetrate into the nearby soil, resulting in soil alkalization.

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