装配式建筑外墙接缝用密封胶应用分析

2021-01-07 13:36:16张焕焕,王今华,殷会玲,韩铭,李璐洋,杜渐,潘文杰,余璐
粘接 2021年12期

张焕焕,王今华,殷会玲,韩铭,李璐洋,杜渐,潘文杰,余璐

摘 要:装配式建筑需要在施工现场对预制混凝土板材进行部分浇筑和拼装,这种施工方法会出现很多拼接缝,需要填入专用密封胶起到有效的防水密封作用。因此,装配式建筑的接缝用密封胶对于装配式建筑外墙的防水密封有着很重要的作用。本文结合装配式建筑用基材特点和密封胶标准要求,分析了外墙接缝用密封胶的粘接、永久变形、模量和位移能力等的性能要求,得出密封胶应选用25LM级别及以上低模量、有配套底涂料、粘接力强、耐候性和耐污染性好的硅酮或硅烷改性类密封胶的结论。

关键词:装配式建筑;粘接;永久变形;模量;位移能力

中图分类号:TQ437+.1;TU533 文献标识码:A     文章編号:1001-5922(2021)12-0129-05

Application Analysis of Sealant for Joints of Prefabricated Building Outer Walls

Zhang Huanhuan, Wang Jinhua, Yin Huiling, Han Ming, Li Luyang, Du Jian,

Pan Wenjie, Yu Lu

(Henan Building Materials Research and Design Institute Co., Ltd., Zhengzhou 450002, China)

Abstract:Prefabricated buildings need to be partially poured and assembled on the construction site of precast concrete plates, in which there are a lot of splicing joints. Special sealant needs to be filled to play an effective waterproof sealing role. Therefore, the sealant used for the joints of the prefabricated building has a very important role in the waterproof sealing of the prefabricated building out walls. Combining with the characteristics of prefabricated building base material and sealant standards, the performance requirements, such as bonding, permanent deformation, modulus, displacement capacity and others, for out wall joints sealant are analyzed. Thus the silicone or silane modified sealant with a low modulus of 25LM level or above, subsidiary base coating, strong adhesion, good weather resistance and pollution resistance should be selected.

Key words:Prefabricated building; Bonding; Permanent deformation; Modulus; Displacement capacity

0 引言

随着低碳经济与绿色建筑概念的升温,装配式建筑由于是集中生产、快速建造、节能减排(在全寿命周期里,装配式建筑的环境效益要比传统建筑节约91.16元/m2)[1]等优势明显。近年来,我国推行的市场主导、政府推动的原则及逐步健全的技术标准体系,有效地推动了装配式建筑快速发展。据报道,至2020年全国31个省、直辖市、自治区和新疆生产建设兵团新开工的装配式建筑面积共6.3亿m2,较2019年增长了50%,约占新建建筑面积的20.5%,完成了《“十三五”装配式建筑行动方案》中确定的 “到2020年达到15%以上” 的工作目标 [2]。显然,装配式建筑已经成为未来绿色建筑发展的主要方向之一。

装配式建筑的腾飞离不开建筑密封胶的快速发展。……

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