- 吉 飛1,焦寶祥2,丘 泰1
2013年第5期
摘要
引用本文
摘??要:研究了尿素對磷酸鎂水泥(MPC)凝結時間和水化放熱過程的影響。結果表明,在磷酸二氫鉀與氧化鎂質量比為1:3、水膠比為0.16時,單獨添加尿素作為緩凝劑,對MPC凝結時間和水化放熱影響不顯著。當尿素和硼砂同時添加時,體系的凝結時間和水化放熱曲線有顯著的不同。在硼砂量為磷酸二氫鉀與氧化鎂質量總和的1%時,隨尿素添加量的增加,MPC的凝結時間顯著延長,其第一和第二水化放熱峰峰高顯著降低;但當硼砂添加量達2.5%時(在尿素摻量相同的情況下),體系的凝結時間又有所縮短,水化放熱峰峰值相應增高。Abstract:Theeffectsofureaonsettingtimeandhydrationexothermicprocessofmagnesiumphosphatecement(MPC)arestudied.TheresultsshowthattheeffectsofureaonsettingtimeandhydrationexothermicprocessarenotobviousifitisusedasthesingleretarderintheMPC,whichisdesignedbythepotassiumdihydrogenphosphateandmagnesiumoxidewithamassproportionof1:3andawatertosolidratioof0.16.Ifureaandboraxareaddedtogether,thesettingtimeandhydrationexothermiccurvesareobviouslydifferent.Whentheadditionofboraxis1%ofthesumweightofpotassiumdihydrogenphosphateandmagnesiumoxideintheMPC,thesettingtimeincreasesandtheintensityforthefirstandthesecondhydrationexothermicpeakssignificantlydecreaseswiththeincreaseoftheureacontent.However,whentheadditionofboraxreaches2.5%andtheadditionofureaisconstant,thesettingtimedecreasesandtheintensityofhydrationexothermicpeaksincreasesaccordingly.