3种水质对Ⅳ型石膏固化后膨胀的影响

摘要

Type IV gesso was cured by laboratory distilled water,tap water and commercially obtained pure water respectively.2 h,12 h and 24 h after curing,linear expansion of the gesso samples was measured and compared.Tap-water curing produced the greatest linear ex-pansion,followed by laboratory distilled water and then pure water(P<0.05).The mineral components in the common tap-water may con-tribute to the larger expansion.%用实验室净水机制备蒸馏水、自来水和市售瓶装纯净水分别调拌的IV型石膏，固化2、12、24 h后测试线性膨胀率，2组纯净水调拌的Ⅳ型石膏比自来水调拌的Ⅳ型石膏线固化膨胀率小（P＜0．05）。自来水中的矿物质成分含量远超过2种纯净水，调拌的Ⅳ型石膏产生了更多的非结晶水，导致较高的线固化膨胀率。