Experimental determination of the initial compressive strength of concrete using a rebound test hammer

Construmat 2018

Cikrle, P.^1 ; Kocab, D.^1 ; Misak, P.^1

Faculty of Civil Engineering, Brno University of Technology, Veveri 331/95, Brno

602 00, Czech Republic^1

关键词: Compressive strength of concrete;    Experimental determination;    High-accuracy;    Nondestructive methods;    Rebound hammers;    Regression model;    Test specimens;    Water/cement ratio;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/385/1/012008/pdf
DOI  :  10.1088/1757-899X/385/1/012008

来源: IOP

【 摘 要 】

This paper deals with rebound hammer testing of concrete in the early stage of ageing. Six types of concrete were produced for the purpose of the presented experiment and differed in the water/cement ratio and were otherwise identical as to the input components. SilverSchmidt PC L test hammer was used to determine the rebound coefficient Q and compressive strength of cube test specimens. The aim of the experiment was to verify the possibility of creating a conversion relationship between the determined parameter of the used non-destructive method and the real compressive strength of concrete in the first days of ageing of concrete. Based on the conducted experiment, it may be stated that the SilverSchmidt PC L test hammer with a mushroom plunger is a suitable instrument for determining the initial compressive strength of concrete, starting from the value of about 5 N/mm2. An important conclusion is the fact that it is possible to create a regression model with relatively high accuracy, in this case approximately ± 3 N/mm2.