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Corresponding Author

柯国炬，男，博士，副教授.E-mail：keguoju@163.com

Abstract

To address the key issue of mica minerals in manufactured sand limiting concrete performance, this study compared the synergistic and differential effects of biotite and granite powder and systematically investigated the effects of biotite and mica-containing granite powder on the rheological properties, evolution of mechanical properties, and microscopic mechanisms of cement paste using TOC,XRD,FTIR,TG-DTG, and SEM, thus providing a theoretical basis for controlling mica mineral content and optimizing manufactured-sand concrete performance. The results show that both biotite and mica-containing granite powder significantly increase the plastic viscosity of cement paste, with biotite having a more pronounced effect. At a biotite dosage of 6%, the final plastic viscosity of the paste reaches 1.655 1 Pa ⋅ s, which is 122% higher than that of the control group. At a granite powder dosage of 12%, the plastic viscosity increases to 1.105 9 Pa ⋅ s, representing an increase of 48%. Both biotite and mica-containing granite powder promote the early-age strength development of cement paste through the nucleation effect, but excessive incorporation reduces its long-term strength. When the biotite dosage increases from 2% to 6%, the 28 d compressive strength of the paste decreases by 10.69 MPa. When the granite powder dosage increases from 4% to 12%, the 28 d compressive strength of the paste decreases by 17.15 MPa. Biotite and mica-containing granite powder have little effect on early hydration but significantly inhibit the later hydration process. At 28 d, both markedly reduce the formation of Ca (OH)2, ettringite, and C- (A)-S-H gel, thus limiting long-term strength development.

Publication Date

8-16-2026

DOI

10.14048/j.issn.1671-2579.2026.04.007

First Page

62

Last Page

71

Submission Date

August 2026

Reference

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