Foamed concrete and process for its production

By optimizing the composition and preparation process of foamed concrete, especially the compounding of cementitious materials and ultra-light fillers, as well as the use of layered injection molding and ice granules, the shrinkage problem of foamed concrete has been solved, and its crack resistance and durability have been improved.

CN120864849BActive Publication Date: 2026-07-03SHANGHAI TUNNEL PORT BUILDING MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI TUNNEL PORT BUILDING MATERIALS CO LTD
Filing Date
2025-08-05
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing foamed concrete has a large specific surface area due to its porous structure, resulting in rapid water evaporation and a large drying shrinkage rate. This makes it prone to surface cracking due to volume shrinkage, especially in low-density products, where the shrinkage problem is more prominent, affecting durability and waterproof performance.

Method used

A specific ratio of cementitious materials (a blend of silicate cement and sulfoaluminate cement), ultralight fillers (sepiolite powder, redispersible latex powder, polypropylene fiber, and chlorite powder), and admixtures (ultrafine fly ash and silica fume) are used to optimize the pore structure. Additives (polycarboxylate superplasticizer, dodecyl dimethyl tertiary amine, and fatty alcohol polyoxyethylene ether) are used to control the casting process, thereby reducing the rate of moisture evaporation and shrinkage stress.

Benefits of technology

It effectively inhibits the shrinkage cracking of foamed concrete, improves the crack resistance and durability of concrete, and maintains the thermal insulation performance at low density.

✦ Generated by Eureka AI based on patent content.

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Abstract

This application relates to the field of energy-saving building materials, specifically disclosing a foamed concrete and its preparation process. The foamed concrete comprises the following components by weight: 150-260 parts of cementitious material, 50-100 parts of ultra-lightweight filler, 60-80 parts of admixture, 6-10 parts of foaming agent, 2-5 parts of additives, and 140-180 parts of water; the cementitious material includes silicate cement and sulfoaluminate cement in a mass ratio of (2-3):1; the ultra-lightweight filler includes sepiolite powder, redispersible latex powder, polypropylene fiber, and chlorite powder in equal mass ratios. This application optimizes the formulation and process of foamed concrete to improve the shrinkage problem of foamed concrete.
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