Preparation method of alkali activator activated fiber reinforced steel slag concrete

By leveraging the synergistic effect of composite alkaline activators, hybrid fibers, and multi-source industrial solid waste aggregates, the problems of slow early strength development and insufficient toughness in steel slag concrete have been solved, achieving efficient resource utilization and performance improvement of steel slag concrete.

CN121672980APending Publication Date: 2026-03-17SHAANXI RAILWAY INST
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Patent Information

Application Number
CN202610171699.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-02-06
Publication Date
2026-03-17

AI Technical Summary

Technical Problem

Existing technologies struggle to fully activate steel slag while simultaneously improving its early strength and fracture toughness, and to achieve efficient and synergistic resource utilization of various industrial solid wastes, thus limiting the practical application of steel slag concrete in engineering projects.

Method used

A concrete preparation method employing the synergistic effect of composite alkaline activator, hybrid fiber, and multi-source industrial solid waste aggregate is proposed. By constructing a concrete system with the synergistic effect of composite alkaline activator, hybrid fiber, and multi-source industrial solid waste aggregate, the potential cementitious activity of steel slag is enhanced, a dense CSH gel is generated, and the fiber-matrix interface bonding strength is strengthened. The aggregate gradation is optimized to achieve multi-scale toughening.

Benefits of technology

It significantly improves the early strength and fracture toughness of steel slag concrete, realizes the efficient resource utilization of various industrial solid wastes, and takes into account both mechanical properties and environmental benefits.

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Abstract

The invention belongs to the technical field of building materials, particularly relates to a preparation method of alkali activator activated fiber reinforced steel slag concrete, and aims to solve the problems that the steel slag concrete is low in early strength, insufficient in toughness and low in industrial solid waste synergistic utilization rate. According to the preparation method disclosed by the invention, a multi-source aggregate system is formed by the hot disintegration treated steel slag, the recycled coarse aggregate, the tailing sand and the natural sand; sodium silicate with the modulus of 1.0-1.5 and sodium carbonate / sodium hydroxide mixed alkali form a composite alkali activator; 1.0%-1.5% of corrugated steel fibers and 0.4%-0.6% of bunchy polypropylene fibers are doped to form a hybrid reinforcing system; the concrete is prepared through aggregate pre-wetting, staged stirring and a standard curing process. According to the method, the early strength and the fracture toughness can be remarkably improved, and efficient resource utilization of various industrial solid wastes is achieved.
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