Study on the influence of limestone powder on the strength of sustainable UHPC cementitious material system

Abstract

Abstract: In order to investigate the effect of limestone powder (LP) on the strength of sustainable ultra-high performance concrete (UHPC) cementitious material systems, the compressive strength, pore structure, phase composition, and microstructure of UHPC cementitious material systems after 4%, 8% and 12% replacement of cement by LP were investigated. Additionally, the environmental effects were quantitatively assessed using life cycle theory (LCA). The results showed that as the LP substitution rate increases, the compressive strength initially increased and then decreased with an inverse trend observed for the total porosity. The optimal substitution rate was 4%, which resulted in a 16.7% increase in compressive strength and a 28% reduction in total porosity compared to the blank group (LPC). LP does not participate in hydration but contributes to pore structure refinement through filler and nucleation effects. When the substitution rate exceeds 4%, dilution effects predominate. LP substitution rate greater than 4% significantly reduces the adverse effect on the environment but will have a negative effect on the strength and internal structure of the specimen. Therefore, the LP substitution rate should be increased as much as possible under the condition of ensuring the strength of the specimen.

Key words: limestone power, ultra-high performance concrete, mechanical properties, microstructure, environmntal effects

CLC Number:

TU375

NAN Xue-li, WNAG Yi, CHEN Hao, LI Mei, TNAG Wei-bin. Study on the influence of limestone powder on the strength of sustainable UHPC cementitious material system[J]. Journal of Lanzhou University of Technology, 2024, 50(6): 113-118.

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URL: https://journal.lut.edu.cn/EN/

https://journal.lut.edu.cn/EN/Y2024/V50/I6/113

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