One-Part Alkali-Activated Wood Biomass Binders for Cemented Paste Backfill

Minerals, Journal Year: 2025, Volume and Issue: 15(3), P. 273 - 273

Published: March 7, 2025

This study developed a one-part alkali-activated slag/wood biomass fly ash (WBFA) binder (AAS) for preparing cemented paste backfill (CPB) as an alternative to traditional cement. Through multi-scale characterizations (XRD, FTIR, TGA, rheological testing, and MIP) performance analyses, the regulation mechanisms of slag/WBFA ratios on hydration behavior, microstructure, mechanical properties were systematically revealed. Results demonstrate that high slag proportions significantly enhance slurry rheology strength, primarily through generating dense gel networks products promoting particle aggregation via reduced zeta potential. Although inert components in WBFA inhibit early hydration, long-term reactivity effectively counteracts these negative effects, achieving comparable 28-day compressive strength between slag/WBFA-based CPB (4.11 MPa) cement-based (4.16 MPa). Microstructural analyses indicate disordered gels AAS systems exhibit silicon–oxygen bond polymerization degrees (950 cm−1) cement, while regulates Ca/Si induce bridging site formation (900 cm−1), reducing porosity enhancing structural compactness. research provides theoretical support process optimization strategies developing low-cost, high-performance mine filling materials using industrial solid wastes, advancing sustainable green mining practices.

Language: Английский

Experimental Study on the Mechanical Properties of Cracked Limestone Reinforced by Modified Cement Grouting

Processes, Journal Year: 2025, Volume and Issue: 13(4), P. 1205 - 1205

Published: April 16, 2025

Grouting reinforcement is a pivotal approach to enhancing the integrity and load-bearing capacity of fractures in surrounding rock. In this study, standard limestone specimens were fractured through uniaxial compression. Then, reinforced with grouting, using ultrafine cement paste containing varying mass fractions enhancers grouting apparatus developed by authors. After cured under conditions for 28 days, CT scanning technology was used investigate microstructure effect characteristics grouted bodies different from mesoscopic perspective. compression tests conducted on those specimens. The experimental results revealed that content enhancer significantly affected post-peak characteristics, mechanical parameters, failure modes When increased 2.50 wt.% 15.00 wt.%, compressive strength exhibited positive correlation content, maximum improvement rate reaching 18.10% compared residual strength. However, when ranged 20.00 negatively correlated content. At an overall stability optimal, all parameters their values. Utilizing three-dimensional reconstruction technology, it observed less than cracks concentrated matrix rather solid edge regions whole specimens, exceeded matrix. Conversely, greater 17.50 predominantly distributed within fissures while internal lower volume fraction solid. scenario, fissures.

Language: Английский