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多数混凝土外加剂中含有糖、硫酸钠等,如果含量过多,都直接影响外加剂在水泥中的作用效果,有时甚至有害。生产外加剂的原料大多利用工业下脚料,如蔗糖化钙是利用制糖厂的副产品——废糖蜜,硫酸钠是利用生产重铬酸盐的副产品——芒硝。所以往往也会给外加剂带入一些杂质,使其成分复杂化,给化学分析带来了困难。目前,我国外加剂质量标准及检验方法尚未统一,对于外加剂中蔗糖含量的测定方法至今未见报导。本所对JT(锦州产)NC(山东,天津产)TG(山东产)外加剂中蔗糖含量分析前预处理进行了反复试验得出:采用离子交换分离法较为理想。该法可除去废糖蜜中的蛋白质和钙离子以及芒硝带入的杂质,使溶液纯化。预处理后的溶液以廉-爱浓法测定糖含量。通过试
Most concrete admixtures contain sugar, sodium sulfate, etc., if the content is too much, all directly affect the effect of additives in the cement effect, and sometimes even harmful. Most of the raw materials used to make admixtures utilize industrial waste, such as sucrose cacao, which is a byproduct of the sugar mill - waste molasses, and sodium sulphate is the use of thenardite, a by-product of the production of dichromate. So often will also bring some impurities to the admixture, so that the composition of the complex, chemical analysis has brought difficulties. At present, the quality standards and testing methods of admixtures in our country have not been uniformed yet, so there is no report on the determination of sucrose content in admixture. The Institute of JT (Jinzhou) NC (Shandong, Tianjin) TG (Shandong) admixture pretreatment sucrose analysis conducted a trial and found: the use of ion exchange separation is ideal. The method can remove the protein and calcium ions from the molasses and impurities introduced by the mirabilite to purify the solution. Preconditioned solution to Lian - love concentration method for the determination of sugar content. Pass the test