Experimental Study on the Use of Iron Tailings-Based Multicomponent Solid Waste as SCMs

Yannian Zhang, Houqi Sun, Xiaowei Gu, Wenjie Zhang and Bonan Liu
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Yannian Zhang: School of Civil Engineering, Jilin University of Architecture and Technology, Changchun 130114, China
Houqi Sun: College of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China
Xiaowei Gu: School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
Wenjie Zhang: College of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China
Bonan Liu: College of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China

Sustainability, 2022, vol. 14, issue 9, 1-15

Abstract: A considerable amount of carbon dioxide is released during the preparation of traditional Portland cement, which is not in conformity with the sustainable road. Developing supplementary cementitious material (SCMs) and reducing cement consumption are safe ways to solve this problem. Iron tailings (IOTs), a type of mining waste from the beneficiation process of iron ore concentrate, can be used as SCMs in concrete. In order to tackle the problem of low compressive performance of IOTs as SCMs in concrete, this study develops a multi-SCMs system based on IOTs. Mechanical properties and microstructure of samples with different activator contents and ratios were analyzed by compressive strength, differential thermal–thermal gravimetric analysis (DTA-TG), and scanning electron microscopy (SEM). The results show that the compressive strength of the composite gel blocks in different gel systems changed as follows: ternary SCMs system > binary SCMs system > unary SCMs system. The ternary SCMs system (IOTs: Steel slag(SS):Phosphorus slag(PS) = 1:2:2) without activator was added so that it resulted in the highest compressive strength in multi-SCMs system. With the increase in the content of activators, the compressive strength with ternary SCMs system shows a decreasing trend. It is well known from DTA-TG, as well as SEM, that NaOH and Na 2 SiO 3 have an inhibitory effect on the secondary hydration reaction and inhibit the formation of C-S-H gel.

Keywords: iron tailings; steel slag; phosphorus slag; mortar specimen; compressive strength; microscopic analysis (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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