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缓凝剂种类及掺量对高温环境用预应力孔道压浆料性能的影响
作者：张舒1，杨杰1，宋普涛2，夏京亮2，王晶2，冷发光2
（1.中国路桥工程有限责任公司，北京 100011；2.中国建筑科学研究院有限公司，北京 100013）
摘要：采用柠檬酸钠、硼酸和酒石酸为缓凝剂，研究了缓凝剂种类及掺量对高温环境用压浆料的流动度、压力泌水率、自由膨胀率、抗压及抗折强度和抗氯离子渗透性能的影响。结果表明，缓凝剂的掺入可显著降低压浆料的流动度损失，对压浆料的初始流动度、压力泌水率、自由膨胀率、抗压及抗折强度、抗氯离子渗透性能也有一定的影响。缓凝剂对的种类及掺量不同，对压浆料的各项性能影响程度不同，在保证压浆料性能符合JTG/T 3650—2020要求的基础上，压浆料中柠檬酸钠的掺量不宜大于0.09%，硼酸掺量不宜大于0.06%，酒石酸掺量不宜大于0.06%。
关键词：压浆料；缓凝剂；力学性能；抗氯离子渗透性能
中图分类号：T528.571 文献标识码：A 文章编号：1001-702X（2022）12-0067-04
Effect of retarder type and content on performance of prestressing duct grouting material for high temperature environment
ZHANG Shu1，YANG Jie1，SONG Putao2，XIA Jingliang2，WANG Jing2，LENG Faguang2
（1.China Road and bridge Corporation，Beijing 100011，China；2.China Academy of Building Research，Beijing 100013，China）
Abstract：Taking sodium Citrate，boric acid and tartaric acid as retarders，the effects of retarder type and content on the fluidity，bleeding rate，free expansion rate，compressive strength，flexural strength and chloride ion penetration resistance of the grouting material were studied. The results show that the addition of retarder can significantly reduce the fluidity loss of the pressurized slurry，the initial fluidity，pressure bleeding rate，free expansion rate，compressive and flexural strength，chloride ion penetration resistance are also affected. Different types and dosage of retarders have different effects on the properties of the grouting materials. On the basis of ensuring that the properties of the grouting material can meet the requirements of JTG/T 3650—2020，the content of the sodium citrate in the grouting material should not be more than 0.09%，boric acid should not be more than 0.06%，and tartaric acid should not be more than 0.06%.
Key words：grouting material，retarder，physical properties，resistance to chloride ion penetration