Influence of the preparation of the cylindrical specimen surface and approach analysis on the test value of compressive strength

• Type: Article in International Scientific Journal
• Date: 2022-02-12

Authors

Nara Cangussu (Author) FEUP; Isabela Costa (Author) Other; Álvaro Carvalho Júnior (Author) Other; Marise F. Silveira (Author) Other; Farhad Aslani (Author) Other; Lino Maia (Author) FEUP

Journal

Title: Structural Concrete

Pages: 1-15

ISSN: 1464-4177

Publisher: Wiley-Blackwell

Indexing

ISI Web of Knowledge

Scopus

Scientific classification

CORDIS: Technological sciences > Engineering > Civil engineering > Concrete engineering

FOS: Engineering and technology > Civil engineering

Other information

DOI: 10.1002/suco.202100761

Abstract (EN): The worldwide use of the axial compressive strength test makes it fundamental to identify the concrete class. However, this test presents dispersion of results which, consequently, reduces the reliability of the test. The surface of the tops of the specimens influences the values of strength measured, since the lack of flatness impairs the uniform application of the load. Different types of procedures can be used to ensure the flatness of the surfaces. Besides, there are different approaches for data analysis, namely to detect outliers. Thus, this research aimed to study and evaluate, the influence of sulfur capping, capping with confined neoprene sheet and noncapping of the test specimens, and the influence of the approach to detect outliers in order to understand the interference in the results. The sulfur cap presented the lowest dispersion values and the cap with confined neoprene sheet obtained the highest strength. In addition, the results showed that the lack of regularization of the tops of the specimens increased dispersion as it causes an important decrease of the resistance in the concrete. © 2022 International Federation for Structural Concrete.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 15