张丰,李伟,陈刚,祝烨然,白银

• 1:南京水利科学研究院
• 2:水文水资源与水利工程科学国家重点实验室
• 3:新疆水利水电勘测设计研究院有限责任公司
• 4:南京瑞迪高新技术有限公司

摘要(Abstract)：

【目的】高强度硅粉混凝土普遍存在黏度高，施工难度大，开裂风险高等问题，严重影响泄水建筑物抗冲磨混凝土使用性能，因此抗冲磨混凝土设计要同时兼顾抗冲磨性能、施工性能和抗裂性能。【方法】前期通过复配膨胀组分、降黏组分和其他助剂研制了新型的混凝土抗裂降黏剂，以新疆某水利枢纽工程为对象，研究了抗裂降黏剂对不同强度等级硅粉抗冲磨混凝土的工作性、力学、变形、抗裂、抗冲磨等性能的影响，以综合评价其对硅粉抗冲磨混凝土性能改善效果。【结论】结果表明：抗裂降黏剂可用于配制C_(90)55、C_(90)50、C_(28)40不同强度等级的抗冲磨混凝土，且可显著改善硅粉抗冲磨混凝土的施工性能和抗裂性能。【结果】7%抗裂降黏剂的掺入，对混凝土坍落度、含气量、凝结时间影响不大，但可使C_(90)55、C_(90)50、C_(28)40硅粉混凝土拌合物塑性黏度减小64%～76%、屈服剪切应力减小26%～36%。相比于“硅粉”混凝土，“硅粉+抗裂降黏剂”混凝土收缩变形减小，至110 d龄期自生体积变形自始至终表现为“膨胀”,平板试验中单位面积上总开裂面积减小63%～83%,混凝土抗裂性能明显改善。此外，抗裂降黏剂的掺入，有利于提高混凝土内部密实度，可使混凝土抗压、抗拉强度略有提高，水下钢球法抗冲磨强度提高14%～40%。

关键词(KeyWords)： 抗裂降黏剂;硅粉混凝土;抗冲磨性能;黏度;抗裂性能;变形;力学性能

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2020YFC1511902);; 国家自然基金重点项目(51739008);; 中央级公益性科研院所基本科研业务费专项资金项目(Y422008);; 新疆葛洲坝玉龙喀什水利枢纽开发有限公司科研项目资助(Hj423001)

作者(Author): 张丰,李伟,陈刚,祝烨然,白银

DOI: 10.13928/j.cnki.wrahe.2024.10.016

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