配方工艺因素对混凝土抗氯侵蚀性能的影响

IF 2.7 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Infrastructures Pub Date : 2023-06-27 DOI:10.3390/infrastructures8070108
E. Shcherban’, S. A. Stel’makh, A. Beskopylny, L. Mailyan, B. Meskhi, V. Varavka, A. Chernil’nik, D. Elshaeva, O. Ananova
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引用次数: 0

摘要

建筑行业目前的一个问题是,缺乏复杂的、基于科学的技术材料和通用类型建筑材料、产品和结构的设计解决方案,尤其是在氯化物暴露条件下运行的结构方面。本研究的目的是比较和评估在循环氯侵蚀条件下,使用振动、离心和添加微硅改性的振动离心三种不同技术制成的传统混凝土和变差混凝土的耐久性差异。使用扫描电子显微镜进行了实验室实验和分析。振动离心混凝土对循环侵蚀性氯化物暴露的抵抗力最高,与振动混凝土(87%)和离心混凝土(24%)相比,抗压强度下降的百分比较低。使用量为2-6%的微硅作为改性添加剂,而不是作为粘合剂的一部分,对混凝土抗循环氯侵蚀性能产生了积极影响。最有效的干预措施是引入4%的添加剂。由于改性添加剂的使用,在90次“干湿”循环后,振动、离心和振动离心混凝土的强度损失有所减少,其量在45%至55%之间,具体取决于生产复合材料所使用的技术类型。振动离心混凝土和微硅的联合使用使循环氯暴露造成的强度损失减少了188%。
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The Influence of Recipe-Technological Factors on the Resistance to Chloride Attack of Variotropic and Conventional Concrete
A current problem in the construction industry is the lack of complex, scientifically based technological materials and design solutions for universal types of building materials, products, and structures, especially in terms of structures operating under conditions of aggressive chloride exposure. The aim of the study was to compare and evaluate the differences in the durability of conventional and variotropic concretes made using three different technologies, vibrating, centrifuging, and vibro-centrifuging, modified with the addition of microsilica, under conditions of cyclic chloride attack. Laboratory experiments and analyses using scanning electron microscopy were conducted. Vibro-centrifuged concrete showed the highest resistance to cyclic aggressive chloride exposure, which was expressed by a lower percentage drop in compressive strength compared to vibrated (87%) and centrifuged concrete (24%). The use of a microsilica as a modifying additive in the amount of 2–6%, instead of as a part of the binder, had a positive effect on the resistance of concrete to cyclic chloride attack. The most effective intervention was the introduction of additives in the amount of 4%. There was a reduction in the loss of strength of vibrated, centrifuged, and vibro-centrifuged concrete after 90 “dry-wet” cycles, as a result of the use of a modifying additive, in an amount between 45% and 55%, depending on the type of technology being used for producing a composite. The combined effect of the use of vibro-centrifuged concrete and microsilica led to a 188% decrease in strength loss resulting from cyclic chloride exposure.
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来源期刊
Infrastructures
Infrastructures Engineering-Building and Construction
CiteScore
5.20
自引率
7.70%
发文量
145
审稿时长
11 weeks
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