Sustainable Utilization of Waste Oyster Shell Powders with Different Fineness Levels in a Ternary Supplementary Cementitious Material System

Shanglai Liu, Yuan Wang, Bonan Liu, Zhen Zou, Yina Teng, Yidi Ji, Yubo Zhou, Lei V. Zhang and Yannian Zhang
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Shanglai Liu: College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
Yuan Wang: College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
Bonan Liu: School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China
Zhen Zou: School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China
Yina Teng: Changxin International Art School, Yunnan University, Kunming 650031, China
Yidi Ji: College of Fisheries and Life Science, Dalian Ocean University, Dalian 116023, China
Yubo Zhou: School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China
Lei V. Zhang: School of Civil and Transportation Engineering, Hebei University of Technology, 5340 Xiping Road, Tianjin 300401, China
Yannian Zhang: School of Civil Engineering, Shenyang Jianzhu University, Shenyang 110168, China

Sustainability, 2022, vol. 14, issue 10, 1-13

Abstract: As cement manufacturing accounts for 8% of global CO 2 emissions, there is an urgent need to tackle the environmental impacts of cement production and address the decarbonization of construction materials. Adopting supplementary cementitious materials (SCMs), including fly ash, slag, silica fume, etc., can be used as a partial replacement for ordinary Portland cement (OPC) to reduce CO 2 emissions related to the OPC industry, while providing benefits for waste valorization. This study aims to explore the sustainable utilization of a waste oyster shell powder (OSP)–lithium slag (LS)–ground granulated blast furnace slag (GGBFS) ternary SCM system in green concrete. The effect of OSP fineness on compressive strength, hydration products, pore structure, and transport properties in ternary SCM-based mortars was studied using a wide array of experimental techniques, including thermogravimetric analysis (TGA), scanning electron microscopy (SEM) analysis, Mercury intrusion porosimetry (MIP), the water absorption test and the rapid chloride penetration test (RCPT). The results revealed that the concrete with the ternary SCMs showed equivalent compressive strength compared to reference specimens. The water absorption and chloride ion charge of the RCPT in the concrete containing the ternary SCMs decreased by up to 30% and 81.4%, respectively. It was observed that the specimens incorporating the OSP with a mesh size of 3000 exhibited the highest compressive strength and the most refined microstructure.

Keywords: oyster shell powders; compressive strength; permeability; coupling effect; supplementary cementitious materials (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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