Deterioration Reason and Improvement Measure of the Retarding Effect of Protein Retarder on Phosphorus Building Gypsum  

作　　者：刘志刚 TANG Zezheng 杨立荣 WANG Chunmei XIE Yuantao LIU Yisen LIU Zhigang;TANG Zezheng;YANG Lirong;WANG Chunmei;XIE Yuantao;LIU Yisen(College of Materials Science and Engineering,North China University of Science and Technology,Tangshan 063210,China)

机构地区：[1]College of Materials Science and Engineering,North China University of Science and Technology,Tangshan 063210,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2024年第4期962-967,共6页武汉理工大学学报（材料科学英文版）

摘　　要：The retarding effect of protein retarder on phosphorus building gypsum(PBG)and desulfurization building gypsum(DBG)was investigated,and the results show that protein retarder for DBG can effectively prolong the setting time and displays a better retarding effect,but for PBG shows a poor retarding effect.Furthermore,the deterioration reason of the retarding effect of protein retarder on PBG was investigated by measuring the pH value and the retarder concentration of the liquid phase from vacuum filtration of PBG slurry at different hydration time,and the measure to improve the retarding effect of protein retarding on PBG was suggested.The pH value of PBG slurry(<5.0)is lower than that of DBG slurry(7.8-8.5).After hydration for 5 min,the concentration of retarder in liquid phase of DBG slurry gradually decreases,but in liquid phase of PBG slurry continually increases,which results in the worse retarding effect of protein retarder on PBG.The liquid phase pH value of PBG slurry can be adjusted higher by sodium silicate,which is beneficial to improvement in the retarding effect of the retarder.By adding 1.0%of sodium silicate,the initial setting time of PBG was efficiently prolonged from 17 to 210 min,but little effect on the absolute dry flexural strength was observed.

关 键 词：protein retarder phosphorus building gypsum deterioration reason improvement measure 

分 类 号：TQ177.377[化学工程—硅酸盐工业]