Quick-hardening early-strength concrete mineral additive and preparation method thereof

By optimizing the ratio of mineral active materials and composite activators, and combining it with slow-release microcapsule technology, the balance between cost, environmental protection and construction performance of fast-hardening cement has been solved, resulting in a high-strength, fast-hardening and durable concrete additive suitable for emergency repair projects and other scenarios.

CN121107738APending Publication Date: 2025-12-12GUILIN UNIVERSITY OF TECHNOLOGY
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Patent Information

Application Number
CN202511145514.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-08-15
Publication Date
2025-12-12

AI Technical Summary

Technical Problem

While pursuing rapid hardening and high strength, existing fast-hardening cements struggle to balance cost, environmental friendliness, and workability. In particular, their workability and durability are insufficient in low-temperature environments, making it difficult to meet complex and ever-changing engineering needs.

Method used

By optimizing the ratio of mineral active materials (silica fume, slag powder, metakaolin) and introducing composite activators (sodium silicate, lithium sulfate, triethanolamine), combined with slow-release microcapsules (calcium sulfoaluminate particles coated with nano-silica) and auxiliary thickeners (hydroxypropyl methylcellulose and polycarboxylate superplasticizer), the accelerated hydration reaction and slow-release control of mineral materials are achieved.

Benefits of technology

It achieves a concrete compressive strength of over 15MPa within 3 hours, a strength of over 35MPa within 24 hours, and a strength of up to 73MPa within 28 days. It exhibits strong environmental adaptability, excellent construction performance, reduces the rebound rate of shotcrete to below 13%, improves durability, and reduces costs by 40%, aligning with the development trend of green building materials.

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Abstract

The invention discloses a quick-hardening early-strength concrete mineral additive and a preparation method thereof, and belongs to the technical field of building materials. The additive comprises the following components in parts by weight: 50-75 parts of a mineral active material (compounded by silica fume, slag powder and metakaolin), 15-30 parts of a composite activator (sodium silicate, lithium sulfate and triethanolamine synergistically), 5-10 parts of a sustained-release microcapsule (calcium sulphoaluminate coated with nano-silica) and 2-5 parts of an auxiliary thickening agent (compounded by HPMC and a water reducing agent). The preparation method comprises the steps of mineral activation, excitant reaction and mixing of the microcapsule and the thickening agent. After the additive is doped into concrete, the 3h compressive strength is greater than or equal to 15MPa, the initial setting time is less than or equal to 5min, and the additive has low resilience (less than or equal to 13%), high durability (impermeability is greater than or equal to P11) and environmental adaptability (-5 DEG C strength fluctuation ratio is less than or equal to 9%). And compared with the prior art, the cost is reduced by 40%, and the method has remarkable economic and social benefits.
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