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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 for the reduction of strength and structural damage of newly cast concrete at negative temperatures were analyzed, and corresponding countermeasures were proposed. LDJ series antifreeze agents (early strength type and composite type) were developed. The test results show that the performance indicators of LDJ series antifreeze all meet or exceed the relevant standards. According to the microscopic test results, the mechanism of the LDJ series antifreeze on concrete is also discussed.