Selcuk, Levent; Gökce, H. Suleyman; Kayabali, Kamil; Simsek, Osman

This study presents a practical nondestructive testing (NDT) method: the nail penetration test (NPT). The major tools of the test technique are a gas nailer with 130 J (95.88 ft-lbf) power, concrete nails, and a gas nailer cell. The study covers three different limestone aggregate types. Six concrete mixtures were prepared from each aggregate type. Five nail shots were performed on each concrete mixture (or grade) and the average value was obtained. The average nail penetration depths were correlated with the compressive strength of concrete. Other NDT techniques, such as the Schmidt rebound hammer (SRH), ultrasonic pulse velocity (UPV), and Windsor probe (WP), were also applied to concrete samples. The measured compressive strength values were compared with those obtained from the empirical relationships using the data from the NPT, SRH, UPV, and WP. It was found that the reliability of the NPT to estimate the compressive strength of concrete is very high. The tool employed in the investigation covers a relatively wide range of compressive strength of concrete. This testing tool is proposed to estimate the compressive strength of in-place concrete.

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Gökce, H. Suleyman; Simsek, Osman

At prefabrication, concrete which is 30 MPa and more compressive strength is generally used in the production of structure components such as colon, beam etc. In new generation productions, expected property of the components is not only compressive strength, but also tensile splitting strength, bond strength and lightness which provides advantage on movement and molding. In this study, the engineering properties of the concrete prepared by CEM I 42.5 R type cement by using pumice and normal aggregate were investigated On determination of compressive strength 100x200 mm sized cylinder sample, on determination of tensile splitting and bond strength 150x150x150 mm sized cube sample and O12 ribbed steel bar was used. It is found that light-weight concrete (LC) which was prepared with pumice aggregate is 30% lighter than normal concrete (NC) prepared with normal aggregate and at equal strength. According to the NC, the LC was obtained by 48% less tensile splitting strength and 15% less bond strength.

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