Alite-belite composite new phase high-strength cement clinker and preparation method thereof

By adjusting the mineral phase composition of the Alite-Belit composite new phase high-strength cement clinker and using modifiers, the problem of insufficient mid-to-late stage strength of high Belite sulfoaluminate cement was solved, achieving the effects of high early stage strength, continuous development of late stage strength, and cost reduction.

CN118108432BActive Publication Date: 2026-07-21UNIV OF JINAN
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
UNIV OF JINAN
Filing Date
2024-03-15
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

High-belite sulfoaluminate cement suffers from insufficient strength development in the mid-to-late stages, and its production process is complex and costly.

Method used

A new high-strength cement clinker with Alite-Belit composite phase was adopted. By adjusting the mineral phase composition and adding modifiers, a novel component system dominated by C3S-C2S-Q phase-C4A3-C4AF was formed. The modifiers included ZnO, BaO, CaF2 and B2O3. The calcination temperature and cooling method were controlled to promote the coexistence of high-temperature and low-temperature mineral phases and improve hydration activity.

Benefits of technology

This achieves high early-stage strength and continuous strength development in cement clinker, reduces production costs, improves shrinkage and erosion resistance, and reduces carbon emissions.

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Abstract

The application discloses an alite-belite composite new-phase high-strength cement clinker and a preparation method thereof. In terms of mass percentage, a mineral phase composition of the cement clinker comprises C3S: 15-25%, C2S: 30-40%, Q phase: 15-25%, C4A3$: 10-20% and C4AF: 5-10%. The Q phase is a CaO-Al2O3-MgO-SiO2 quaternary compound, and the C2S contains alpha'-C2S. A modifier is further added to a raw material composition of the cement clinker, and the modifier simultaneously comprises a metal oxide and a non-metal substance. The process of the application successfully realizes coexistence of a high-temperature mineral phase (tricalcium silicate) and a low-temperature mineral phase (calcium sulphoaluminate and Q phase) in the cement clinker, simultaneously converts dicalcium silicate from a low-activity form into a high-activity form, and overcomes the problem of insufficient strength development in a middle and later period of a high-belite sulphoaluminate cement.
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