采用八通道微量热仪研究了不同 m (M)/m (P)(氧化镁和磷酸二氢钾质量比)比值、水胶比(W/B)、硼砂掺量、粉煤灰掺量和磷酸盐种类对磷酸镁水泥水化热的影响规律.实验结果表明,磷酸镁水泥的水化存在吸热和放热两个过程,包含一个吸热谷和两个放热峰,吸热谷产生于磷酸盐的溶解,放热峰与氧化镁溶于酸性溶液及产物的形成有关；提高 m (M)/m (P)比值、水胶比、硼砂掺量和粉煤灰掺量都会降低磷酸镁水泥水化的放热速率和放热量；以磷酸二氢铵、磷酸二氢钠、磷酸二氢钾为磷酸盐所制备的磷酸镁水泥的水化放热峰峰值和放热量分别达到了0．430714,0．145677,0．194626 W 和1198．949,452．798,902．872 J,表明了磷酸盐种类对磷酸镁水泥水化热和放热速率有显著的影响,这与三者的溶解度和 pH 值有关.
Micro calorimeter of eight channels was used to study the influent law of different M/P ratio (quality ratio of magnesium and potassium dihydrogen phosphate),the ratio of water and binder (W/B ratio),borax content,dosage of fly ash and phosphate species on the magnesium phosphate cement hydration heat.The re-sults show that the magnesium phosphate cement hydration was an endothermic and exothermic process.It has one endothermic valley and two exothermic peaks.The endothermic valley arises from the dissolution of phos-phate,the exothermic peaks associate with the dissolution of magnesia in acid solution and the formation of product.The release rate of heat and heat quantity of magnesium phosphate cement hydration was reduced by improving the M/P ratio,the W/B ratio,borax content and dosage of fly ash.The hydration exothermic peak and heat of magnesium phosphate cement of ammonium dihydrogen phosphate,sodium dihydrogen phosphate, potassium dihydrogen phosphate was 0.430714,0.145677,0.1 94626 W and 1 1 98.949,452.798,902.872 J,re-spectively,which not only indicates that phosphate species have significant influence on hydration heat,but also was related to their the solubility and pH value.
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