A slag-soil-based polymer recycled aggregate concrete and a preparation method thereof

By preparing recycled aggregates based on slag and soil using uncalcined raw slag and composite alkali activators, a homogeneous and compatible system is formed, which solves the performance defects of slag-soil based artificial aggregates and the carbon emission problem of cementitious materials. This enables the preparation of low-energy, high-performance concrete and improves the strength, fluidity and durability of concrete.

CN122277162APending Publication Date: 2026-06-26HARBIN INSTITUTE OF TECHNOLOGY (SHENZHEN) (INSTITUTE OF SCIENCE AND TECHNOLOGY INNOVATION HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN)
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HARBIN INSTITUTE OF TECHNOLOGY (SHENZHEN) (INSTITUTE OF SCIENCE AND TECHNOLOGY INNOVATION HARBIN INSTITUTE OF TECHNOLOGY SHENZHEN)
Filing Date
2026-03-11
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing slag-slag-based artificial aggregate concrete suffers from problems such as high porosity, high water absorption, low strength, high carbon emissions from traditional cementitious materials, high energy consumption, unscientific mix design, and high pretreatment energy consumption, making it difficult to achieve high-performance, low-cost, and environmentally friendly concrete preparation.

Method used

Uncalcined and unground raw slag is combined with a composite alkali activator and a dual-path granulation process to prepare slag-slag-based polymer recycled aggregate, forming a homogeneous 'aggregate-slurry' system. The interfacial strength is improved through chemical bonding, and the use of whole-grain polymer cementitious materials to replace cement reduces energy consumption and carbon emissions.

Benefits of technology

It significantly improves the overall performance of concrete, including high strength (compressive strength ≥15MPa), low water absorption (≤5%), excellent fluidity and durability, and reduces production energy consumption by more than 60%, achieving a win-win situation for both economic and environmental benefits.

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Abstract

This invention discloses a slag-slag-based polymer recycled aggregate concrete and its preparation method. The concrete comprises slag-slag-based polymer recycled aggregate, geopolymer cementitious paste, sand, and water. The recycled aggregate is produced by activating uncalcined, unground virgin slag and granulated blast furnace slag with a composite alkali activator, followed by granulation and curing, resulting in an aluminosilicate network structure. The geopolymer cementitious paste is formed by alkali activation using granulated blast furnace slag as the main cementing material. The aggregate and paste form a continuous structure with chemical bonds in the interfacial transition zone, constituting a homogeneous "aggregate-paste" system. This invention is the first to directly utilize virgin slag without calcination or grinding to prepare high-strength aggregate, reducing energy consumption by over 60%, with a solid waste content exceeding 80%. The resulting concrete exhibits good workability (slump 160-220mm) and high strength (C30-C50), significantly reducing carbon emissions and production costs. It is suitable for road base courses, municipal utility tunnels, and ecological slope protection projects.
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