A synergist for machine-made sand super high performance concrete and a preparation method thereof

The special synergist for ultra-high performance concrete made from manufactured sand, designed in synergy with three major functional systems, solves the problems of high viscosity, concentrated heat of hydration, and shrinkage cracking in manufactured sand UHPC. It achieves integrated reduction of slurry viscosity, regulation of heat of hydration, and shrinkage compensation, thereby reducing the production cost of UHPC and improving its construction adaptability and durability.

CN122403831APending Publication Date: 2026-07-17INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
Filing Date
2026-04-17
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

Existing synergists cannot effectively solve the complex problems of high viscosity, concentrated heat of hydration, and shrinkage cracking in manufactured sand UHPC, and cannot meet the characteristic requirements of manufactured sand.

Method used

An anhydrous multi-component synergistic design of three major functional systems—viscosity modification, expansion and shrinkage reduction, and hydration heat inhibition—is used to prepare a special synergist for ultra-high performance concrete made from manufactured sand. This synergist includes a viscosity modification system, an expansion and shrinkage reduction system, and a hydration heat inhibition system. It is prepared into a powder form through an anhydrous system, which is adapted to the angular shape, high water absorption rate, and stone powder adsorption characteristics of manufactured sand, to achieve integrated functions of viscosity reduction, temperature control, and crack resistance.

Benefits of technology

It achieves a reduction of more than 25% in slurry viscosity, a reduction of more than 15°C in internal temperature peak, a reduction of more than 30% in shrinkage rate, a reduction of 30%-50% in the overall cost of UHPC, ensures mechanical properties and durability, is compatible with dry mixing processes, and improves construction adaptability.

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Abstract

本发明公开了一种机制砂超高性能混凝土专用增效剂及其制备方法，属于混凝土外加剂技术领域。针对传统UHPC依赖优质天然骨料导致成本高、资源紧缺，以及机制砂UHPC存在粘度大、水化热集中、易开裂的技术痛点，同时克服现有混凝土增效剂无法适配机制砂UHPC复合性能需求的缺陷，本发明通过黏度改性系统、膨胀减缩系统与水化热抑制系统的无水多组分协同设计，制备出功能集成化的专用增效剂。该增效剂可使机制砂UHPC浆体粘度降低25%以上，收缩率降低30%以上，内部温峰降幅≥15℃，保障混凝土28d抗压强度≥120MPa，实现机制砂对石英砂、河砂的高效替代，降低UHPC生产成本30%‑50%，适用于桥梁、抗爆结构等大规模工程场景。
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Citation Information

Patent Citations

  • Cement synergist and preparation method thereof

    CN115893906A