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建筑石膏與膠凝材料
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鋁硅質礦物摻合料對磷酸鉀鎂水泥砂漿物理力學性能的影響

作者:吳慶1,許奇1,楊建明2,王剛1

關鍵字:鋁,硅質,礦物,摻合,料,對,磷酸,鉀鎂,水泥,

 
(1.江蘇科技大學  土木工程與建筑學院,江蘇 鎮江  212000;2.鹽城工學院  土木工程學院,江蘇 鹽城  224051)
    摘要:采用重燒氧化鎂、磷酸二氫鉀、復合緩凝劑、引氣型減水劑和石英砂為主要原料制備磷酸鉀鎂水泥(MKPC)砂漿。研究了鋁硅質礦物摻合料(偏高嶺土、伊利石)對MKPC物理力學性能的影響。結果表明,相同水灰比下,分別摻10%偏高嶺土及10%伊利石時,MKPC砂漿的流動度較未摻加分別降低了7.5%、5.0%;摻伊利石早期表現出較好的抗壓性能;60 d齡期時,摻偏高嶺土的MKPC砂漿抗壓強度最高;摻加鋁硅質礦物摻合料提高了MKPC漿體的抗折強度,其中摻偏高嶺土效果更明顯。偏高嶺土和伊利石中活性物質SiO2和Al2O3等對水化有促進作用,形成了磷酸鋁[AlPO4和Al(PO3)3]凝膠,使水化產物及整體結構更加致密,填充效果明顯。
    關鍵詞:MKPC;砂漿;抗折強度;抗壓強度;微觀分析
    中圖分類號:TU526        文獻標識碼:A        文章編號:1001-702X(2019)11-0122-05
 
Effect of aluminous silica mineral admixture on physical and mechanical properties of potassium magnesium phosphate cement mortar
WU Qing1,XU Qi1,YANG Jianming2,WANG Gang1
(1.School of Civil Engineering and Architecture,Jiangsu University of Science and Technology,Zhenjiang 212000,China;
2.School of Civil Engineering,Yancheng Institute of Technology,Yancheng 224051,China)
    Abstract:Potassium magnesium phosphate cement(MKPC) mortar was prepared by using calcined magnesia,potassium dihy-
drogen phosphate,composite retarder,bleed-type water reducing agent and quartz sand as main raw materials. The effects of aluminous siliceous mineral admixtures(metakoalin,illite) on the physical and mechanical properties of MKPC were investigated. The results showed that the fluidity of MKPC mortar decreased by 7.5% and 5.0%,respectively,when 10% metakoalin and 10% illite were added in the same water-cement ratio. In the early stage,the admixture of illite exhibited better compressive properties. At the age of 60 days,the compressive strength of MKPC mortar mixed with metakoalin is the highest. The flexural strength of MKPC paste was improved by adding aluminous siliceous mineral admixture,especially metakoalin. The active substances SiO2 and Al2O3 in metakoalin and illite promoted hydration,and form aluminum phosphate [AlPO4 and Al(PO3)3] gels,which made the hydration products and the overall structure more compact and the filling effect was obvious.
    Key words:MKPC,mortar,flexural strength,compressive strength,microscopic analysis
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