Preparation method of zeolite geopolymer cementing material

Abstract

The invention discloses a preparation method of a zeolite geopolymer cementing material. The method comprises the following steps: (1), preparing a silicon-aluminum mixture; (2), preparing an alkalineactivator; and (3), preparing a zeolite geopolymer cementing material. According to the geopolymer cementing material, metakaolin, zeolite, red mud, coal ash, magnesium oxide and other raw materialsare reasonably utilized, so that activation reaction of all the material components is improved; alkali metal ions are firmly combined in a reaction product, and the surface frosting problem can be slightly relieved. The prepared zeolite geopolymer cementing material is high in strength and high in hardening speed, and the 28-day strength can reach over 48 MPa. Magnesium oxide in the raw materialsplays a role of a filling and expanding agent and can effectively absorb carbon dioxide. By optimizing the proportion, the geopolymer is more excellent in corrosion resistance by being compared withordinary Portland cement, small in capillary pore number, good in impermeability, small in shrinkage, high in setting speed and high in applicability, and the sustainable development requirements of ecological environmental protection can be met.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a zeolite geopolymer gelling material and a preparation method thereof. Background technique [0002] The preparation of geopolymer is a new material obtained by burning clay (metakaolin), alkali activator and other materials through corresponding treatment and reaction. This inorganic polymer material with a three-dimensional oxide network structure is very similar to ceramics and has better performance than cement. The materials in the production process do not need high-temperature treatment, and can be used directly or at low temperature. The raw materials are simple and widely sourced, and the price is low. Compared with cement, the carbon dioxide emission is less, which saves energy and reduces emissions. At the same time, under alkaline conditions, the dehydration reaction of geopolymeric aluminosilicate is reversible, and the product can be reused after crus...

AI Technical Summary

Problems solved by technology

[0003] CN105271848A invention uses kaolin and manganese tailings slag as the main raw materials to prepare, the production process is simple, and manganese tailings slag is used to replace part of metakaolin, which reduces the cost of geopolymer cementitious materials and improves the comprehensive utilization of manganese tailings. The dosage and modulus of the activator water glass are difficult to guarantee the gelling effect of the geopolymer, and the shrinkage is large

[0004] The current geopolymer gelling materials mainly have the following problems: (1) rapid setting, how to control the setting time within a suitable range without significantly reducing the strength; (2) the surface is prone to frost, which not only affects the appearance of the product, but also It will reduce the impermeability of the product and the bonding strength between the interface and the interface; (3) The long-term process of alkali-aggregate reaction damage is very necessary for in-depth research on various mineral admixtures or admixtures that inhibit the alkali-aggregate reaction ; (4) Shrinkage, mastering the properties and relationships between components can reduce shrinkage through corresponding means; (5) Strength is susceptible to fluctuations, mineral structure is unstable, etc. In addition, the activity of fly ash is difficult to activate. These problems are controlled within a reasonable range, and it is of great significance to maximize the use of materials and have a good use effect.