摘要
为了更好地推广石膏这种环保胶凝材料,改善单掺缓凝剂对石膏强度和水化带来的负面影响,本文利用正交试验设计方法对柠檬酸、三聚磷酸钠、骨胶三种缓凝剂进行复配研究,分别考察各因素对建筑石膏凝结时间、强度、吸水率及耐水性的影响,同时借助灰关联分析确定各因素所占比例,综合评价复配缓凝剂对建筑石膏性能的影响。试验结果表明:柠檬酸是影响复配缓凝剂缓凝效果的最主要因素,三聚磷酸钠对石膏强度有明显的负面影响,且掺不同配比缓凝剂的建筑石膏性质差异很大。最终确定高效缓凝剂的最佳配比为柠檬酸、三聚磷酸钠和骨胶的质量分数分别为0.06%、0%和0.2%,此时,建筑石膏的初凝时间64.0 min,终凝时间79.0 min,抗折强度4.54 MPa,抗压强度11.85 MPa,吸水率33.33%,软化系数0.37。该实验结果可为建筑石膏复配缓凝剂的选择和制备提供依据。
In order to promote the plaster,an environmental-friendly gel material,and to improve the negative influences on gypsum strength and hydration caused by single coagulant,a orthogonal method was used to study the compound with three factors, including citric acid, sodium tripolyphosphate,and bone glue. The setting time, strength, and water resistance of gypsum variation against all factors and levels were investigated,and the grey relational analysis was used to deterimine the optimum mixing ratio of plaster, and to evaluate the influences of compound retarder. Test results show that the retarding time is mainly influenced by citric acid,while sodiumtripolyphosphate has a negative effect on strength,and that the retarder ratio influences the plaster property obviously. In our experiment,the optimum ratios of citric acid,sodium tripolyphosphate,and bone glue are respectively 0. 06%,0% and 0. 2% in mass faction,and under this condition,the initial setting time,final setting time,rupture strength,compressive strength,water absorption,and softening coefficient are 64 minutes,79 minutes,4. 54 MPa,11. 85 MPa,33. 33%,and 0. 37,respectively. These experiment results provide foundations for the compound retarders selection and preparation for building plaster design.
出处
《广西大学学报（自然科学版）》
CAS
北大核心
2017年第4期1554-1560,共7页
Journal of Guangxi University（Natural Science Edition）
基金
国家自然科学基金资助项目(51502021)
中国博士后科学基金资助项目(2015M570805)
中央高校基本科研业务费项目(310831161011
310831153315
310831151080)
关键词
建筑石膏
缓凝剂
正交试验设计
灰关联分析
复配
building gypsum
retarder
orthogonal experimental design
grey relational analysis
composite addition
