Publication detail

Determination of a Suitable Moment for Formwork Removal from a Concrete Structure Using Rebound Hammer Test Methods

MISÁK, P. KOCÁB, D. CIKRLE, P.

Original Title

Determination of a Suitable Moment for Formwork Removal from a Concrete Structure Using Rebound Hammer Test Methods

Type

conference paper

Language

English

Original Abstract

Determining the compressive strength of concrete in the early stages of ageing has been an increasingly relevant topic in recent years, particularly with regard to safe removal of formwork from a structure or its part. The compressive strength of concrete which designates safe removal of formwork without damaging the structure can be referred to as ”stripping strength”. It is undoubtedly beneficial to be able to determine the moment of safe formwork removal in a non-destructive manner, i.e. without compromising the structure. Modern rebound hammer test methods seem to be a suitable instrument with which it is possible to reduce the length of technological breaks associated with concrete ageing to a minimum, and consequently, reduce the total cost of the construction. However, the use of these methods presents a number of challenges. As many conducted experiments have shown, there is no single conversion relationship (regression model) between non-destructive rebound hammer test methods and compressive strength. It is therefore advisable to always create a unique conversion relationship for each individual concrete. In addition, it must be noted that conventional regression analysis methods operate with 50% reliability. In construction testing, however, the most common is the so-called characteristic value, which is defined as a 5% quantile. This value is therefore determined with 95% reliability. This paper describes the construction of a so-called ”characteristic curve”, which can be used to estimate the compressive strength of concrete in a structure using rebound hammer test methods with 95% reliability. Consequently, the values obtained from the characteristic curve can be easily used for practical applications.

Keywords

Concrete; Rebound Hammer Test; Characteristic Value; Characteristic Curve; Compressive Strength

Authors

MISÁK, P.; KOCÁB, D.; CIKRLE, P.

Released

9. 8. 2021

Publisher

Trans Tech Publications Ltd

Location

Switzerland

ISBN

978-3-0357-1821-8

Book

27th Concrete Days

ISBN

1662-9779

Periodical

Solid State Phenomena

Year of study

322

State

Swiss Confederation

Pages from

23

Pages to

27

Pages count

5

URL

https://www.scientific.net/SSP.322.23

BibTex

@inproceedings{BUT172179,
  author="Petr {Misák} and Dalibor {Kocáb} and Petr {Cikrle}",
  title="Determination of a Suitable Moment for Formwork Removal from a Concrete Structure Using Rebound Hammer Test Methods",
  booktitle="27th Concrete Days",
  year="2021",
  journal="Solid State Phenomena",
  volume="322",
  pages="23--27",
  publisher="Trans Tech Publications Ltd",
  address="Switzerland",
  doi="10.4028/www.scientific.net/SSP.322.23",
  isbn="978-3-0357-1821-8",
  issn="1662-9779",
  url="https://www.scientific.net/SSP.322.23"
}