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Priscillia Laniesse - One of the best experts on this subject based on the ideXlab platform.
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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
Cement and Concrete Research, 2020Co-Authors: Priscillia Laniesse, Céline Cau Dit Coumes, Gwenn Le Saout, Adel MesbahAbstract: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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setting and Hardening Process of a wollastonite based brushite cement
Cement and Concrete Research, 2018Co-Authors: Priscillia Laniesse, Celine Cau Dit Coumes, Arnaud Poulesquen, Agathe Bourchy, Adel Mesbah, Gwenn Le Saout, Philippe GaveauAbstract:Abstract Wollastonite-based brushite cements are used for refractory material applications, but they may also offer prospects for the solidification/stabilization of hazardous waste. These binders are formed by the reaction of wollastonite with an orthophosphoric acid solution containing borax and metallic cations (Al3+, Zn2+). This work provides new insights into their setting and Hardening Process using a panel of characterization techniques (XRD, NMR, rheology…). A multi-step hydration Process is evidenced by the formation of several products: amorphous silica, monocalcium phosphate monohydrate (Ca(H2PO4)2·H2O or MCPM), that precipitates transiently during the first stage of hydration, and brushite (CaHPO4·2H2O) that crystallizes at higher pH (≥3). In addition, an amorphous phosphate phase containing aluminum, calcium and zinc massively precipitates at the beginning of hydration, and gets richer in calcium as hydration progresses. Setting of the cement paste occurs when brushite starts to form. The successive formation of MCPM and brushite is well predicted by thermodynamic modelling.
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Setting and Hardening Process of a wollastonite-based brushite cement
Cement and Concrete Research, 2018Co-Authors: Priscillia Laniesse, Arnaud Poulesquen, Agathe Bourchy, Adel Mesbah, Gwenn Le Saout, Céline Cau Dit Coumes, Philippe GaveauAbstract:Wollastonite-based brushite oements are used for refractory material applications, but they may also offer prospects for the solidification/stabilization of hazardous waste. These binders are formed by the reaction of wollastonite with an orthophosphoric acid solution containing borax and metallic cations (Al 3+ , Zn 2+). This work provides new insights into their setting and Hardening Process using a panel of characterization techniques (XRD, NMR, rheology ...). A multi-step hydration Process is evidenced by the formation of several products: amorphous silica, monocalcium phosphate monohydrate (Ca(H 2 P0 4 h·H 2 O or MCPM), that precipitates tran siently during the first stage of hydration, and brushite (CaHP04·2H2Ü) that crystallizes at higher pH (;;e:3). ln addition, an amorphous phosphate phase containing aluminum, calcium and zinc massively precipitates at the beginning of hydration, and gets richer in calcium as hydration progresses. Setting of the cernent paste occurs when brushite starts to form. The successive formati on of MCPM and brushite is well predicted by thermo dynamic modelling.
Adel Mesbah - One of the best experts on this subject based on the ideXlab platform.
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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
Cement and Concrete Research, 2020Co-Authors: Priscillia Laniesse, Céline Cau Dit Coumes, Gwenn Le Saout, Adel MesbahAbstract: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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setting and Hardening Process of a wollastonite based brushite cement
Cement and Concrete Research, 2018Co-Authors: Priscillia Laniesse, Celine Cau Dit Coumes, Arnaud Poulesquen, Agathe Bourchy, Adel Mesbah, Gwenn Le Saout, Philippe GaveauAbstract:Abstract Wollastonite-based brushite cements are used for refractory material applications, but they may also offer prospects for the solidification/stabilization of hazardous waste. These binders are formed by the reaction of wollastonite with an orthophosphoric acid solution containing borax and metallic cations (Al3+, Zn2+). This work provides new insights into their setting and Hardening Process using a panel of characterization techniques (XRD, NMR, rheology…). A multi-step hydration Process is evidenced by the formation of several products: amorphous silica, monocalcium phosphate monohydrate (Ca(H2PO4)2·H2O or MCPM), that precipitates transiently during the first stage of hydration, and brushite (CaHPO4·2H2O) that crystallizes at higher pH (≥3). In addition, an amorphous phosphate phase containing aluminum, calcium and zinc massively precipitates at the beginning of hydration, and gets richer in calcium as hydration progresses. Setting of the cement paste occurs when brushite starts to form. The successive formation of MCPM and brushite is well predicted by thermodynamic modelling.
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Setting and Hardening Process of a wollastonite-based brushite cement
Cement and Concrete Research, 2018Co-Authors: Priscillia Laniesse, Arnaud Poulesquen, Agathe Bourchy, Adel Mesbah, Gwenn Le Saout, Céline Cau Dit Coumes, Philippe GaveauAbstract:Wollastonite-based brushite oements are used for refractory material applications, but they may also offer prospects for the solidification/stabilization of hazardous waste. These binders are formed by the reaction of wollastonite with an orthophosphoric acid solution containing borax and metallic cations (Al 3+ , Zn 2+). This work provides new insights into their setting and Hardening Process using a panel of characterization techniques (XRD, NMR, rheology ...). A multi-step hydration Process is evidenced by the formation of several products: amorphous silica, monocalcium phosphate monohydrate (Ca(H 2 P0 4 h·H 2 O or MCPM), that precipitates tran siently during the first stage of hydration, and brushite (CaHP04·2H2Ü) that crystallizes at higher pH (;;e:3). ln addition, an amorphous phosphate phase containing aluminum, calcium and zinc massively precipitates at the beginning of hydration, and gets richer in calcium as hydration progresses. Setting of the cernent paste occurs when brushite starts to form. The successive formati on of MCPM and brushite is well predicted by thermo dynamic modelling.
Philippe Gaveau - One of the best experts on this subject based on the ideXlab platform.
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setting and Hardening Process of a wollastonite based brushite cement
Cement and Concrete Research, 2018Co-Authors: Priscillia Laniesse, Celine Cau Dit Coumes, Arnaud Poulesquen, Agathe Bourchy, Adel Mesbah, Gwenn Le Saout, Philippe GaveauAbstract:Abstract Wollastonite-based brushite cements are used for refractory material applications, but they may also offer prospects for the solidification/stabilization of hazardous waste. These binders are formed by the reaction of wollastonite with an orthophosphoric acid solution containing borax and metallic cations (Al3+, Zn2+). This work provides new insights into their setting and Hardening Process using a panel of characterization techniques (XRD, NMR, rheology…). A multi-step hydration Process is evidenced by the formation of several products: amorphous silica, monocalcium phosphate monohydrate (Ca(H2PO4)2·H2O or MCPM), that precipitates transiently during the first stage of hydration, and brushite (CaHPO4·2H2O) that crystallizes at higher pH (≥3). In addition, an amorphous phosphate phase containing aluminum, calcium and zinc massively precipitates at the beginning of hydration, and gets richer in calcium as hydration progresses. Setting of the cement paste occurs when brushite starts to form. The successive formation of MCPM and brushite is well predicted by thermodynamic modelling.
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Setting and Hardening Process of a wollastonite-based brushite cement
Cement and Concrete Research, 2018Co-Authors: Priscillia Laniesse, Arnaud Poulesquen, Agathe Bourchy, Adel Mesbah, Gwenn Le Saout, Céline Cau Dit Coumes, Philippe GaveauAbstract:Wollastonite-based brushite oements are used for refractory material applications, but they may also offer prospects for the solidification/stabilization of hazardous waste. These binders are formed by the reaction of wollastonite with an orthophosphoric acid solution containing borax and metallic cations (Al 3+ , Zn 2+). This work provides new insights into their setting and Hardening Process using a panel of characterization techniques (XRD, NMR, rheology ...). A multi-step hydration Process is evidenced by the formation of several products: amorphous silica, monocalcium phosphate monohydrate (Ca(H 2 P0 4 h·H 2 O or MCPM), that precipitates tran siently during the first stage of hydration, and brushite (CaHP04·2H2Ü) that crystallizes at higher pH (;;e:3). ln addition, an amorphous phosphate phase containing aluminum, calcium and zinc massively precipitates at the beginning of hydration, and gets richer in calcium as hydration progresses. Setting of the cernent paste occurs when brushite starts to form. The successive formati on of MCPM and brushite is well predicted by thermo dynamic modelling.
Arnaud Poulesquen - One of the best experts on this subject based on the ideXlab platform.
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setting and Hardening Process of a wollastonite based brushite cement
Cement and Concrete Research, 2018Co-Authors: Priscillia Laniesse, Celine Cau Dit Coumes, Arnaud Poulesquen, Agathe Bourchy, Adel Mesbah, Gwenn Le Saout, Philippe GaveauAbstract:Abstract Wollastonite-based brushite cements are used for refractory material applications, but they may also offer prospects for the solidification/stabilization of hazardous waste. These binders are formed by the reaction of wollastonite with an orthophosphoric acid solution containing borax and metallic cations (Al3+, Zn2+). This work provides new insights into their setting and Hardening Process using a panel of characterization techniques (XRD, NMR, rheology…). A multi-step hydration Process is evidenced by the formation of several products: amorphous silica, monocalcium phosphate monohydrate (Ca(H2PO4)2·H2O or MCPM), that precipitates transiently during the first stage of hydration, and brushite (CaHPO4·2H2O) that crystallizes at higher pH (≥3). In addition, an amorphous phosphate phase containing aluminum, calcium and zinc massively precipitates at the beginning of hydration, and gets richer in calcium as hydration progresses. Setting of the cement paste occurs when brushite starts to form. The successive formation of MCPM and brushite is well predicted by thermodynamic modelling.
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Setting and Hardening Process of a wollastonite-based brushite cement
Cement and Concrete Research, 2018Co-Authors: Priscillia Laniesse, Arnaud Poulesquen, Agathe Bourchy, Adel Mesbah, Gwenn Le Saout, Céline Cau Dit Coumes, Philippe GaveauAbstract:Wollastonite-based brushite oements are used for refractory material applications, but they may also offer prospects for the solidification/stabilization of hazardous waste. These binders are formed by the reaction of wollastonite with an orthophosphoric acid solution containing borax and metallic cations (Al 3+ , Zn 2+). This work provides new insights into their setting and Hardening Process using a panel of characterization techniques (XRD, NMR, rheology ...). A multi-step hydration Process is evidenced by the formation of several products: amorphous silica, monocalcium phosphate monohydrate (Ca(H 2 P0 4 h·H 2 O or MCPM), that precipitates tran siently during the first stage of hydration, and brushite (CaHP04·2H2Ü) that crystallizes at higher pH (;;e:3). ln addition, an amorphous phosphate phase containing aluminum, calcium and zinc massively precipitates at the beginning of hydration, and gets richer in calcium as hydration progresses. Setting of the cernent paste occurs when brushite starts to form. The successive formati on of MCPM and brushite is well predicted by thermo dynamic modelling.
Agathe Bourchy - One of the best experts on this subject based on the ideXlab platform.
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setting and Hardening Process of a wollastonite based brushite cement
Cement and Concrete Research, 2018Co-Authors: Priscillia Laniesse, Celine Cau Dit Coumes, Arnaud Poulesquen, Agathe Bourchy, Adel Mesbah, Gwenn Le Saout, Philippe GaveauAbstract:Abstract Wollastonite-based brushite cements are used for refractory material applications, but they may also offer prospects for the solidification/stabilization of hazardous waste. These binders are formed by the reaction of wollastonite with an orthophosphoric acid solution containing borax and metallic cations (Al3+, Zn2+). This work provides new insights into their setting and Hardening Process using a panel of characterization techniques (XRD, NMR, rheology…). A multi-step hydration Process is evidenced by the formation of several products: amorphous silica, monocalcium phosphate monohydrate (Ca(H2PO4)2·H2O or MCPM), that precipitates transiently during the first stage of hydration, and brushite (CaHPO4·2H2O) that crystallizes at higher pH (≥3). In addition, an amorphous phosphate phase containing aluminum, calcium and zinc massively precipitates at the beginning of hydration, and gets richer in calcium as hydration progresses. Setting of the cement paste occurs when brushite starts to form. The successive formation of MCPM and brushite is well predicted by thermodynamic modelling.
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Setting and Hardening Process of a wollastonite-based brushite cement
Cement and Concrete Research, 2018Co-Authors: Priscillia Laniesse, Arnaud Poulesquen, Agathe Bourchy, Adel Mesbah, Gwenn Le Saout, Céline Cau Dit Coumes, Philippe GaveauAbstract:Wollastonite-based brushite oements are used for refractory material applications, but they may also offer prospects for the solidification/stabilization of hazardous waste. These binders are formed by the reaction of wollastonite with an orthophosphoric acid solution containing borax and metallic cations (Al 3+ , Zn 2+). This work provides new insights into their setting and Hardening Process using a panel of characterization techniques (XRD, NMR, rheology ...). A multi-step hydration Process is evidenced by the formation of several products: amorphous silica, monocalcium phosphate monohydrate (Ca(H 2 P0 4 h·H 2 O or MCPM), that precipitates tran siently during the first stage of hydration, and brushite (CaHP04·2H2Ü) that crystallizes at higher pH (;;e:3). ln addition, an amorphous phosphate phase containing aluminum, calcium and zinc massively precipitates at the beginning of hydration, and gets richer in calcium as hydration progresses. Setting of the cernent paste occurs when brushite starts to form. The successive formati on of MCPM and brushite is well predicted by thermo dynamic modelling.
