Low carbon binder modified by calcined quarry dust for cemented paste backfill and the associated environmental assessments

Yingliang Zhao; Jingping Qiu; Shiyu Zhang; Zhenbang Guo; Pinqi Wu; Xiaogang Sun; Xiaowei Gu

doi:10.1016/j.jenvman.2021.113760

Low carbon binder modified by calcined quarry dust for cemented paste backfill and the associated environmental assessments

J Environ Manage. 2021 Dec 15:300:113760. doi: 10.1016/j.jenvman.2021.113760. Epub 2021 Sep 14.

Authors

Yingliang Zhao¹, Jingping Qiu², Shiyu Zhang¹, Zhenbang Guo¹, Pinqi Wu¹, Xiaogang Sun¹, Xiaowei Gu¹

Affiliations

¹ College of Resources and Civil Engineering, Northeastern University, Shenyang, China; Science and Technology Innovation Center of Smart Water and Resource Environment, Northeastern University, Shenyang, China.
² College of Resources and Civil Engineering, Northeastern University, Shenyang, China; Science and Technology Innovation Center of Smart Water and Resource Environment, Northeastern University, Shenyang, China. Electronic address: qiujgingping@mail.neu.edu.cn.

PMID: 34534757
DOI: 10.1016/j.jenvman.2021.113760

Abstract

Cemented paste backfill (CPB) favors the sustainable development of mine industry. However, as the primary cementitious binders in CPB, the high cost of ordinary Portland cement (OPC) discourages CPB utilization. In the present work, low-carbon and low-cost binders activated by Na₂CO₃ supplemented by calcined quarry dust were used in CPB. The binder was prepared using a 'one-part' method. It was found that binders prepared using 8% Na₂CO₃ and 5% CQD show the best performance. The superior properties of the binders were attributed to the promoted binder hydration and special phase assembles of the hydration products. Cost and carbon emission analysis showed that Na₂CO₃ activated binder was cheaper and greener. The cost and CO₂ emission of binder B8Q5 were lower than OPC by around 34.16% and 87.76%, respectively. Besides, leaching tests showed that all the toxic metals were stabilized, which posed no environmental risk.

Keywords: Alkali-activated materials; Carbon emission; Cemented paste backfill; Heavy metals; One-part.

MeSH terms

Carbon*
Construction Materials
Dust*

Substances

Dust
Carbon