Influence of the Graphene Oxide on the Pore-Throat Connection of Cement Waste Rock Backfill

Author:

Cheng Zhangjianing12,Wang Junying1,Hu Junxiang1,Lu Shuaijie1,Gao Yuan134,Zhang Jun1,Wang Siyao1

Affiliation:

1. School of Transportation and Civil Engineering, Nantong University, Nantong 226019, China

2. College of Civil Engineering, Tongji University, Shanghai 200092, China

3. Nantong Key Laboratory of Intelligent Civil Engineering and Digital Construction, Nantong University, Nantong 226019, China

4. Nantong Taisheng Blue Lsland Offshore Co., Ltd., Nantong 226200, China

Abstract

The pore-throat characteristics significantly affect the consolidated properties, such as the mechanical and permeability-related performance of the cementitious composites. By virtue of the nucleation and pore-infilling effects, graphene oxide (GO) has been proven as a great additive in reinforcing cement-based materials. However, the quantitative characterization reports of GO on the pore-throat connection are limited. This study applied advanced metal intrusion and backscattered electron (BSE) microscopy scanning technology to investigate the pore-throat connection characteristics of the cement waste rock backfill (CWRB) specimens before and after GO modification. The results show that the microscopic pore structure of CWRB is significantly improved by the GO nanosheets, manifested by a decrease in the total porosity up to 31.2%. With the assistance of the GO, the transfer among internal pores is from large equivalent pore size distribution to small equivalent pore size distribution. The fitting relationship between strength enhancement and pore reinforcement efficiency under different pore-throat characteristics reveals that the 1.70 μm pore-throat owns the highest correlation in the CWRB specimens, implying apply GO nanosheets to optimizing the pore-throat under this interval is most efficient. Overall, this research broadens our understanding of the pore-throat connection characteristics of CWRB and stimulates the potential application of GO in enhancing the mechanical properties and microstructure of CWRB.

Funder

National College Student Innovation Training Program

Natural Science Foundation of the Jiangsu Higher Education Institutions of China

Nantong Basic Science Research Program of China

Publisher

MDPI AG

Subject

General Materials Science

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