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Hydration and properties of hydrogen-based mineral phase transformation iron ore tailings as supplementary cementitious material.
Tang, Zhidong; Meng, Xiangheng; Han, Yuexin; Chen, Meng; Gao, Peng; Zhang, Yahui.
Afiliação
  • Tang Z; School of Resources and Civil Engineering, Northeastern University, Shenyang, 110819, China; National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources, Shenyang, 110819, China.
  • Meng X; School of Resources and Civil Engineering, Northeastern University, Shenyang, 110819, China; National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources, Shenyang, 110819, China.
  • Han Y; School of Resources and Civil Engineering, Northeastern University, Shenyang, 110819, China; National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources, Shenyang, 110819, China.
  • Chen M; School of Resources and Civil Engineering, Northeastern University, Shenyang, 110819, China; Institute for Frontier Technologies of Low-Carbon Steelmaking, Northeastern University, Shenyang, 110819, China.
  • Gao P; School of Resources and Civil Engineering, Northeastern University, Shenyang, 110819, China; National-local Joint Engineering Research Center of High-efficient Exploitation Technology for Refractory Iron Ore Resources, Shenyang, 110819, China. Electronic address: gaopeng@mail.neu.edu.cn.
  • Zhang Y; Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL, A1B3X5, Canada.
J Environ Manage ; 356: 120594, 2024 Apr.
Article em En | MEDLINE | ID: mdl-38503229
ABSTRACT
Almost all iron ore tailings (IOTs) required activation prior to use as SCMs, which limited their application in building materials. This study investigated HMPT-IOTs and discovered that they possess latent hydraulic and pozzolanic properties. In order to better utilize as SCM, mechanical properties, hydration reactions, hydration products, microstructure, and pores were comprehensively studied through mechanical tests, hydration heat tests, XRD, SEM, TG, and MIP. The results show that when HMPT-IOTs replace cement at 10 wt%, 20 wt% and 30 wt%, the compressive strength at 28 days is 41.9 MPa, 47.9 MPa and 37.5 MPa, respectively. When the substitution amount reaches 30 wt%, it will reduce the cumulative heat of hydration and promote early hydration reactions. The main hydration products are ettringite and Ca(OH)2. As the nucleation site of C-S-H, hydration products are interconnected, making the microstructure denser. At this substitution level, Ca(OH)2 consumption was about 2% at 28 days of age. Simultaneously, the total pore volume was only 0.01 mL/g greater than that of the control group, and the number of micropores and transition pores decreased by approximately 3%.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Materiais de Construção / Hidrogênio Idioma: En Ano de publicação: 2024 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Materiais de Construção / Hidrogênio Idioma: En Ano de publicação: 2024 Tipo de documento: Article