A high impermeability concrete and a method for its production

By using composite fibers of lignin-modified polyvinyl alcohol fiber and enzymatically modified lignin in concrete, the problem of insufficient concrete impermeability was solved, and high density and frost resistance were improved.

CN117735924BActive Publication Date: 2026-05-26SHAOXING SHANGYU NANFANG PUYIN CONCRETE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHAOXING SHANGYU NANFANG PUYIN CONCRETE CO LTD
Filing Date
2023-12-20
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

The existing concrete has insufficient impermeability and density, which makes it prone to leakage in underground or aquatic environments, affecting its frost resistance and durability.

Method used

A composite fiber consisting of lignin-modified polyvinyl alcohol fiber, polypropylene fiber, and ordinary fiber is used. During the cement hydration process, the lignin-modified polyvinyl alcohol fiber absorbs and slowly releases water, forming a volume complementary structure that improves the density of the slurry. At the same time, the enzymatic modification of lignin increases the hydrophilicity of the fiber and enhances its impermeability.

Benefits of technology

It significantly improves the impermeability and frost resistance of concrete, enhances the density and frost resistance grade of concrete, and has mild reaction conditions and high enzymatic hydrolysis efficiency.

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Abstract

This application discloses a high-permeability concrete and its preparation method, relating to the field of concrete technology. The concrete comprises the following raw materials in parts by weight: 240-360 parts cement, 40-100 parts fly ash, 700-900 parts crushed stone, 550-700 parts sand, 10-30 parts expansion agent, 15-35 parts water-reducing agent, 10-40 parts composite fiber, and 96-186 parts water; wherein the composite fiber includes lignin-modified polyvinyl alcohol fiber, polypropylene fiber, and ordinary fiber, with a weight ratio of 1:(0.5-1.1):(0.2-0.8); wherein the lignin-modified polyvinyl alcohol fiber raw material includes polyvinyl alcohol, enzymatically modified lignin, and solvent, with a weight ratio of 1:(0.1-0.8):(9-11); the enzymatically modified lignin is composed of the following raw materials in parts by weight: 40-80 parts lignin, 120-240 parts distilled water, and 20-40 parts bio-enzyme. The concrete provided in this application can effectively improve the concrete's resistance to seepage pressure and frost resistance, with a maximum seepage pressure resistance of 7.6 MPa.
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