考察了熟石灰、三聚氰胺、聚乙烯醇、反应助剂等外加剂对建筑石膏制品抗折强度和表面硬度的影响.结果表明,熟石灰添加量在0～10%时,随着熟石灰添加量增加,硬化浆体的抗折强度随之稍有降低,但表面硬度随之增大.三聚氰胺添加量为2%时,建筑石膏硬化浆体的抗折强度最高.三聚氰胺添加量为4%时,建筑石膏硬化浆体的表面硬度最高.聚乙烯醇的适宜添加量为0.8%.反应助剂的添加量大于3%时,建筑石膏硬化浆体抗折强度和表面硬度随反应助剂添加量的增加呈现出相反的变化趋势.SEM表明,外加剂使二水石膏晶体的形貌和排列发生了明显的变化,微观结晶体以针状和柱状为主,晶体间相互紧密搭接构成致密的网状结构,且晶体排列整齐,气孔分布均一,试样抗折强度和表面硬度均比较高.
The rupture strength and surface hardness of set gypsum was studied by doping in additive agents as calcium hydroxide、melamine、polyvinyl alcohol、reactant addition agent. The dose of each additive reagent was investigated. The rupture strength was slightly reduced while surface hardness was increased during the increasing dose of calcium hydroxide varied from 0 to 10%. The rupture strength was the highest when the dose of melamine was 2%. The surface hardness was best when the dose of melamine was 4%. The appropriate dose of polyvinyl alcohol was 0.8%. It was demonstrated that the trend of rupture strength and surface hardness of set gypsum was opposite when the dose of reactant addition agent increased from 3%. The SEM shows that the morphology and arrangement of the dihydrate gypsum crystal have been apparently changed by the influence of additive agents. The shape of the micro-crystal was almost needle-like and cylindrical. The rigid net structure has been formed by crossed micro-crystal and the arrangement of crystal has been in order. The gas-pocket structure has been dispersed homogeneously. Accordingly, high rupture strength and surface hardness of the set gypsum have been obtained.
参考文献
| [1] | 陈燕;岳文海;董若兰.石膏建筑材料[M].北京:中国建材工业出版社,2003:224-251. |
| [2] | 吴良士;白鸽;袁忠信.矿物与岩石[M].北京:化学工业出版社,2005:185,192. |
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