Feasibility of adding calcium hydroxide to FETNS–OPC: working performance, mechanical properties and reaction mechanism
Source abstract
Abstract
To solve the problem of low early-phase reactivity of ferrous extraction tailings of nickel slag (FETNS), the effects of calcium hydroxide (Ca(OH)2) as an alkali activator on the working performance, mechanical properties and hydration products of FETNS–ordinary Portland cement (OPC) composite cementitious systems were studied. The addition of calcium hydroxide was found to shorten the initial setting time by about 40% and the final setting time by about 20%. The compressive strength at 3, 7, 28 and 60 days was increased by 51.95%, 45.27%, 8.53% and 8.9%, respectively, with the addition of calcium hydroxide. Microstructural assessment (by scanning electron microscopy, X-ray diffraction, simultaneous thermal analysis, nitrogen adsorption test and low-field nuclear magnetic resonance analysis) showed that the incorporation of calcium hydroxide increased the reaction degree of the FETNS–OPC system, and more calcium silicate hydrate gel and ettringite were generated to fill internal pores, thus improving the compactness of the matrix. In summary, the incorporation of calcium hydroxide stimulated the early-phase reactivity of the composite system, promoted the formation of reaction products and optimised the internal pore structure.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Concrete and Cement Materials Research · Magnesium Oxide Properties and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
PhD student, School of Civil Engineering, Lanzhou University of Technology, Lanzhou, China
Professor, School of Civil Engineering, Lanzhou University of Technology, Lanzhou, China
Assistant Professor, School of Civil Engineering, Lanzhou University of Technology, Lanzhou, China
Post-graduate, School of Civil Engineering, Lanzhou University of Technology, Lanzhou, China
Senior Engineer, National Key Laboratory of Ni&Co Associated Minerals Resources Development and Comprehensive Utilization, Jinchang, China
Professor, Lanzhou University of Technology, Lanzhou, China (corresponding author: )
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