Reviews on advanced materials science: Developing low carbon molybdenum tailing self-consolidating concrete: Workability, shrinkage, strength, and pore structure

Luo, Tao; Yi, Yu; Zhang, Tianqi; Li, Li; Yu, Wenbing; Zhang, Xuefu; Zhang, Kaifeng; Mostafa, Sahar A.

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Title:: Reviews on advanced materials science

Publication:: Warsaw: De Gruyter Poland

Note:: Gesehen am 16.10.20; Open Access; Namensnennung 4.0 International

Scope:: Online-Ressource

ISSN:: 1605-8127

ZDB-ID:: 2033066-2

VÖBB-Katalog:: 35288686

Keywords:: Zeitschrift

Classification:: Naturwissenschaften; Technik

Collection:: Naturwissenschaften; Technik

Copyright:: Rights reserved

Accessibility:: Free Access

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Author:: Luo, Tao; Yi, Yu; Zhang, Tianqi; Li, Li; Yu, Wenbing; Zhang, Xuefu; Zhang, Kaifeng; Mostafa, Sahar A.

Title:: Developing low carbon molybdenum tailing self-consolidating concrete: Workability, shrinkage, strength, and pore structure

Publication:: Warsaw: De Gruyter Poland, 2025

Language:: English

Information:: Abstract: Incorporating mineral admixtures is essential to modulate the fresh and hardened properties of self-consolidating concrete (SCC). This study introduced waste molybdenum tailings (MT) as a novel mineral admixture, substituting fly ash in SCC for the first time. The fresh, mechanical properties and drying shrinkage (DS) of SCC were assessed at various MT substitution levels (0, 25, 50, 75, and 100%). Pore structure and microstructure were analyzed using nuclear magnetic resonance and scanning electron microscopy. Increasing MT content resulted in a decline in initial flowability and a gradual increase in early-stage shrinkage. Specifically, at 100% MT replacement, the slump flow decreased by 17.5%, and the DS increased by 65.3%. Notably, the incorporation of MT significantly improved early compressive strength, primarily due to the accelerated hydration reactions. At 3 days, the 25% MT mixture showed a 33.3% increase in compressive strength compared to the control group, demonstrating MT’s positive impact on early-age strength development. At 28 days age, the 25% MT exhibited comparable strength to the control group, with compressive strength and splitting tensile strength of 38.5 and 2.67 MPa, respectively. Our findings illuminated that the strength enhancement at 25% MT was rooted in the refinement of pore structure and interface between aggregate and hydration products, evidenced by a rise in the fraction of pores with dimensions smaller than 100 nm and a marked reduction in bigger ones.

Scope:: Online-Ressource

Note:: Open Access; Archivierung/Langzeitarchivierung gewährleistet

Keywords:: waste Mo tailings ; high flowability concrete ; workability ; strength ; microstructure

Classification:: Naturwissenschaften; Technik

URN:: urn:nbn:de:101:1-2510300719353.206679482774

Collection:: Naturwissenschaften; Technik

Copyright:: CC BY

Accessibility:: Free Access

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