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Understanding the setting and hardening process of wollastonite-based brushite cement. Part 1: Influence of the Ca/P ratio and H3PO4 concentration of the mixing solution

Priscillia Laniesse 1 Céline Cau Dit Coumes 1 Gwenn Le Saout 2 Adel Mesbah 3
2 DMS - Durabilité des éco-Matériaux et Structures
C2MA - Centre des matériaux des Mines d'Alès, LMGC - Laboratoire de Mécanique et Génie Civil
3 LIME - Interfaces de Matériaux en Evolution
ICSM - UMR 5257 - Institut de Chimie Séparative de Marcoule
Abstract : Wollastonite-based brushite cement is prepared by mixing wollastonite with a phosphoric acid solution containing metallic cations and boric acid. This work investigates simplified systems comprising wollastonite and H3PO4 solutions only, in order to clarify the influence of the H3PO4 concentration, Ca/P and l/s ratios (this latter parameter being correlated to the two others) on the setting and hardening process. At constant H3PO4 concentration, increasing the Ca/P ratio, and decreasing the l/s ratio, accelerates the early stages of hydration but limits its progress at 7 d. At high Ca/P ratio, more basic calcium orthophosphates form in addition to dicalcium phosphate. At constant l/s ratio, increasing the H3PO4 concentration in the range 7–10 mol·L−1 retards cement hydration, and inhibits the setting at concentrations ≥12 mol·L−1. A good compromise is obtained for H3PO4 concentrations between 9 and 10 mol·L−1: hydration is not too fast and yields the maximum amount of dicalcium phosphate.
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https://hal.mines-ales.fr/hal-02613966
Contributor : Administrateur Imt - Mines Alès <>
Submitted on : Wednesday, May 20, 2020 - 3:36:39 PM
Last modification on : Saturday, September 19, 2020 - 3:44:19 AM

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Priscillia Laniesse, Céline Cau Dit Coumes, Gwenn Le Saout, Adel Mesbah. Understanding the setting and hardening process of wollastonite-based brushite cement. Part 1: Influence of the Ca/P ratio and H3PO4 concentration of the mixing solution. Cement and Concrete Research, Elsevier, 2020, 134, pp.106094. ⟨10.1016/j.cemconres.2020.106094⟩. ⟨hal-02613966⟩

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