A recycled mortar concrete, its preparation method and application

By impregnating and modifying recycled aggregates with a modifying liquid to form a dense gel network, the problems of high water absorption and low strength caused by microcracks in recycled aggregates are solved, thereby improving the compressive strength and freeze-thaw resistance of recycled mortar concrete.

CN121005551BActive Publication Date: 2026-05-26GUANGDONG QIJIAN ECOLOGICAL ENVIRONMENT GROUP CO LTD
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Patent Information

Application Number
CN202511279885.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-09-09
Publication Date
2026-05-26
Estimated Expiration
2045-09-09

AI Technical Summary

Technical Problem

Microcracks in recycled aggregates lead to high water absorption, poor fluidity, and low strength in the interfacial transition zone of recycled mortar concrete, making it prone to cracking and insufficient strength.

Method used

Modified recycled aggregates are prepared by impregnating them with a modifying liquid, forming a dense gel network using hydrophobic aerogel powder and a crosslinking agent to seal microcracks and improve interfacial bonding. This modified recycled aggregate is then combined with silicate cement, fly ash, quartz sand, and a water-reducing agent to prepare recycled mortar concrete.

Benefits of technology

It improves the compressive strength and freeze-thaw resistance of recycled mortar concrete, enhances its fluidity and workability, reduces water absorption, and strengthens the interfacial transition zone.

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Abstract

This invention discloses a recycled mortar concrete, its preparation method, and its application, belonging to the technical field of recycled mortar concrete. The method involves modifying activated hydrophobic aerogel powder with 3-(methacryloyloxy)propyltrimethoxysilane, then incorporating the resulting modified aerogel powder containing double bond segments into a gel system for crosslinking. Water is added for dilution, resulting in a modified liquid with a solid content of 3-4%. Recycled aggregate is impregnated with the modified liquid to obtain modified recycled aggregate. The modified recycled aggregate, silicate cement, fly ash, quartz sand, water-reducing agent, and water are mixed to obtain recycled mortar concrete. The modified recycled aggregate in the recycled mortar concrete exhibits a crosslinked network on its surface, which acts as a thickener and retarder, regulating the fluidity of the concrete. Furthermore, the hydrophobic modified aerogel powder and crosslinked network seal and strengthen the pores of the recycled aggregate, blocking moisture and improving the freeze-thaw resistance and compressive strength of the recycled mortar concrete.
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