Active mineral admixture for low-grade attapulgite-based sprayed concrete as well as preparation method and application of active mineral admixture

By using mineral admixtures such as active concave and convex rod soil, the gelling performance and hydration of sprayed concrete are improved, and the problem of high block drop and rebound rate in sprayed concrete construction is solved, and the strength and economic benefits are improved.

CN119638256AActive Publication Date: 2025-03-18NANJING TECH UNIV +1
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Patent Information

Application Number
CN202411921764.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-25
Publication Date
2025-03-18
Estimated Expiration
2044-12-25

AI Technical Summary

Technical Problem

In construction, sprayed concrete often faces problems such as block drop, high rebound rate and reduced strength in the later stage, resulting in hindering the construction process and waste of raw materials.

Method used

The composite active mineral admixture consisting of active concave and convex rod soil, active accumulationite, activated montmorillonite, silica fume, metakaolin and fly ash are used to improve the content of active SiO2 and Al2O3 through acidification and high-temperature calcination treatment, and enhance the hydration and gelling performance.

Benefits of technology

Effectively reduce the block and rebound rate of sprayed concrete, improve compressive strength, shorten the initial settling time, improve early strength, save cement consumption, and reduce project costs.

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Abstract

The invention discloses an active mineral admixture for low-grade attapulgite-based sprayed concrete as well as a preparation method and application of the active mineral admixture. The active mineral admixture comprises the following components in parts by mass: 40-60 parts of active attapulgite, 10-20 parts of active rectorite, 5-20 parts of active montmorillonite, 5-15 parts of silica fume, 5-25 parts of metakaolin, 10-20 parts of fly ash and 0.5-6 parts of a water reducing agent. Minerals used in the invention are rich in reserves and low in price, and a stable raw material source is provided for the mineral admixture for the sprayed concrete. When the sprayed concrete obtained on the basis of the active admixture is used for construction operation, the block falling rate and the rebound rate are greatly reduced, the compressive strength is greatly improved, and good economic and environmental benefits and wide application prospects are achieved.
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