基于正交灰关联分析的建筑石膏复配缓凝剂研究

发布时间：2018-06-30 06:09

本文选题：建筑石膏 + 缓凝剂　；参考：《广西大学学报(自然科学版)》2017年04期

【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。
[Abstract]:In order to popularize gypsum as a kind of environment-friendly cementitious material and to improve the negative effect of single retarder on the strength and hydration of gypsum, the orthogonal design method was used to treat citric acid and sodium tripolyphosphate. The effects of various factors on the setting time, strength, water absorption and water resistance of building gypsum were investigated, and the proportion of each factor was determined by grey correlation analysis. Comprehensive evaluation of the influence of complex retarder on the performance of building gypsum. The results show that citric acid is the most important factor affecting the retarding effect of complex retarder, sodium tripolyphosphate has obvious negative effect on the strength of gypsum, and the properties of building gypsum with different ratio of retarder are very different. Finally, the optimum proportion of high efficiency retarder was determined as citric acid. The mass fraction of sodium tripolyphosphate and bone glue were 0.06% and 0.2%, respectively. The initial setting time of building gypsum is 64.0 min, the final setting time is 79.0 min, the flexural strength is 4.54 MPA, the compressive strength is 11.85 MPA, the water absorption is 33.33, the softening coefficient is 0.37. The experimental results can provide basis for the selection and preparation of complex retarder for building gypsum.
【作者单位】：长安大学材料科学与工程学院;
【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)
【分类号】：TQ177.377

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