LDJ 系列防冻剂的研究

STUDY ON THE PROPERTIES OF LDJ ANTI-FREEZING ADMIXTURES

分析了新浇筑混凝土在负温下强度降低和结构破坏的原因，并提出了相应的对策。研制了ＬＤＪ系列防冻剂（早强型和复合型），试验结果表明，ＬＤＪ系列防冻剂各项性能指标都达到或超过有关标准要求。文中还根据微观测试结果探讨了ＬＤＪ系列防冻剂对混凝土的作用机理。

The reasons of structure damage and strength lose of new disposited concrete when cured at negative temperature are analyzed and the appropriate measures are summerized in this paper. The properties of LDJ anti-freezing admixtures (LDJs), which are developed by the authors, are studied. The results show that all of the properties of LDJ sreach or even exceed the relevant standards. The action mechanisms of LDJs on concretes are also discussed.