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.

中文翻译：

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了解硅灰石基透钙磷石水泥的凝结硬化过程。第 1 部分：混合溶液中 Ca/P 比和 H3PO4 浓度的影响

摘要 硅灰石基透钙磷石水泥是通过将硅灰石与含有金属阳离子和硼酸的磷酸溶液混合制备的。这项工作研究了仅包含硅灰石和 H3PO4 溶液的简化系统，以阐明 H3PO4 浓度、Ca/P 和 l/s 比（后一个参数与其他两个参数相关）对凝固和硬化过程的影响。在恒定的 H3PO4 浓度下，增加 Ca/P 比并降低 l/s 比，可加速水化的早期阶段，但将其进展限制在 7 天。在高 Ca/P 比率下，除了磷酸二钙之外，还会形成更多碱性正磷酸钙。在恒定 l/s 比率下，增加 H3PO4 浓度在 7-10 mol·L-1 范围内会延迟水泥水化，并在浓度≥12 mol·L-1 时抑制凝结。