Title: Design of Low Carbon Ultra-High-Performance Concrete Based on Multiscale Fly Ash

Author(s): Quanjun Shen, Ruishuang Jiang, Li Li, Shuai Liu, Baolin Guo

Publication: Materials Journal

Volume:

Issue:

Appears on pages(s):

Keywords: low carbon; MAA model; mechanical properties; mixture proportion; steel fiber; ultra-high-performance concrete; workability

DOI: 10.14359/51742038

Date: 7/10/2024

Abstract:
In this study, low-carbon ultra-high-performance concrete (UHPC) was designed by adding fly ash-based mineral admixtures (SD-FA). The improved Andreasen & Andersen model was used to obtain SD-FA, which was then used to replace part of UHPC cement, to achieve the effect of low-carbon emission reduction. The effects of the composition and dosage of cement-based materials, the water-cement ratio, the composition of sand, the steel fiber content, and the lime-sand ratio on the properties of UHPC were studied, and the design of the batches was optimized. On this basis, the performance changes were analyzed at the micro level. The results show that when the 1~3 grade fly ash content after screening treatment is quantitative, the densest stacking is theoretically reached. The SD-FA optimized design improves the bulk density of UHPC and realizes the dense microstructure of UHPC. Under the optimal mixing ratio, its processability is guaranteed and the mechanical properties are enhanced.