Industrial graphene oxide-fly ash hybrid for high-performance cemented waste rock backfill. (12th December 2022)

• Record Type: Journal Article
• Authors: Gao, Yuan; Sui, Hao; Yu, Zixuan; Wu, Jiangyu; Chen, Weiqiang; Jing, Hongwen; Ding, Minjie; Liu, Yanming
• Is Part Of: Construction & building materials. Volume 359(2022)
• Publication Date: 2022-12-12
• Subjects: Backfill materials -- Affordable graphene oxide -- Microstructure -- Industrial graphene oxide -- Nano-modification; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2022.129484
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: CWRB plays a central role in mining reinforcement projects and waste recycling. IGO reinforces the CWRB microstructure via nucleation and pore-filling effects. Optimized W/C ratio is significant for the modification effects of the IGO-FA hybrid on CWRB. IGO enhances the integrity and toughness of the CWRB specimens. IGO-FA hybrid can replace 20% cement in CWRB without affecting its consolidation properties. Abstract: Cemented waste rock backfills (CWRB) play an essential role in mining safety engineering, waste reduction and harm resource recycling. However, the mechanical and permeability-related properties of the CWRB are limited by cement consumption and cost. This study adopted the industrial graphene oxide-fly ash (IGO-FA) hybrid to produce high-performance, cost-saving, and environment-friendly mine backfill materials. The IGO-FA hybrid exhibited the optimal reinforcing efficiency under a 0.5 water-to-cement ratio, where the CWRBs' mechanical properties and impermeability were enhanced by 5.1%-16.9% and 32.7%-38.9%, respectively, with only 0.007 wt% IGO dosage. Compared with the traditional backfill materials, cement consumption can be reduced by up to 20 wt%. This work not only enhanced the understanding of GO in reinforcing cementitious composites but could also provide an affordable alternative to GO-related composites.