Reaction kinetics and microstructural characteristics of iron-rich-laterite-based phosphate binder

Bewa, Christelle N.; Valentini, Luca; Tchakouté, Hervé K.; Kamseu, Elie; Djobo, Jean Noël Yankwa; Dalconi, Maria Chiara; Garbin, Enrico; Artioli, Gilberto

doi:10.1016/j.conbuildmat.2021.126302

Cited by 15 publications

(3 citation statements)

References 48 publications

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“…This agrees with previous work which demonstrated slow dowing of the reaction progress when a phosphoric acid concentration beyond 8–10 M was used. 19,33,34 One can argue that, beyond 40 °C, the precipitation and condensation process takes over the dissolution reaction since the amount of dissolved elements is already sufficient to undergo that process. Thus it can be proposed that the reaction mechanism occurring, in this case, is the dissolution enhancement followed by the precipitation of the dissolved species when their concentrations become significant.…”

Section: Resultsmentioning

confidence: 99%

The role of curing temperature and reactive aluminum species on characteristics of phosphate geopolymer

et al. 2022

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Section: Resultsmentioning

confidence: 99%

The role of curing temperature and reactive aluminum species on characteristics of phosphate geopolymer

et al. 2022

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“…For two different laterites, maximum compressive strengths of 98 to 105 MPa at 14 days were obtained for curing at 50 • C and 6 M and 8 M concentrations. At low acid concentrations, there is a higher concentration of Fe in the cement matrix based on laterite-phosphate, which may indicate a fine dispersion of small grains of hematite [67]. The acidic activation using calcined iron-rich laterite gave better mechanical performance than calcined clay-rich laterite at the same condition, suggesting the alteration of iron minerals strengthened and densified the geopolymer matrix.…”

Section: Calcined Lateritementioning

confidence: 99%

Acid Activation in Low-Carbon Binders: A Systematic Literature Review

Park,

Pimenta,

Bezerra

2023

Buildings

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Geopolymers have emerged as an alternative binding material to Ordinary Portland Cement (OPC). Recently, there has been an increase in studies exploring the synthesis of these materials using acid activation rather than traditional alkaline activation. This approach offers benefits such as good strength at an early age, better thermal properties, and a chemical activator that emits less carbon to be produced. In addition, it provides resistance to efflorescence and leaching, which are common challenges associated with alkali-activated products. This work analyzed the scientific advances in acid activation in synthesizing an alternative binder to OPC. To this end, a systematic review of the last five years of scientific literature was carried out using the Systematic Review for Engineering and Experiments (SREE) method. The results show a notable increase in research focused on acid activation over the last few years. The acid activators were always phosphate solutions, mainly phosphoric acid. Metakaolin was the most tested precursor, followed by fly ash, and volcanic ash. The research requires improvements in the methodological quality, providing data on molar ratios (Al/P, Si/Al, and Si/P), Liquid/Solid mass ratio, activator solution molarity, and curing process, in addition to statistical treatment and comparison of results. There exists a paucity of diversity in the examined precursors, activators, and additives. Future research developments need to clarify the behavior of mechanical resistance over time, better curing process, water resistance, durability, and the role of iron, magnesium, and calcium silicates and/or oxides. The paper identifies the main research gaps in the area and functions as a database, guiding researchers in selecting raw materials, dosing methodology, and curing processes.

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“…Recently Nkawju et al 42 maintained the solid/liquid ratio of 0.6 in the production of the calcined corroded laterite geopolymer containing the sugarcane fibre up to 7.5 wt%. Bewa et al 43 investigated the effect of liquid to solid on fresh and hardened properties of calcined iron-rich laterite based geopolymer using phosphoric acid at different molarity. They found that varying the liquid to solid ratio positively influenced the end properties of geopolymer products mostly the mechanical and microstructural performance exhibiting a compact and dense structure.…”

Section: Introductionmentioning

confidence: 99%

Towards optimization of mechanical and microstructural performances of Fe-rich laterite geopolymer binders cured at room temperature by varying the activating solution

et al. 2022

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Reaction kinetics and microstructural characteristics of iron-rich-laterite-based phosphate binder

Cited by 15 publications

References 48 publications

The role of curing temperature and reactive aluminum species on characteristics of phosphate geopolymer

The role of curing temperature and reactive aluminum species on characteristics of phosphate geopolymer

Acid Activation in Low-Carbon Binders: A Systematic Literature Review

Towards optimization of mechanical and microstructural performances of Fe-rich laterite geopolymer binders cured at room temperature by varying the activating solution

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