Analysis on Compressive Strength of Concrete Using Spectral Radiometer: A Preliminary Study

Supriya, Vidhyalakshmi
2008 International Research Journal of Engineering and Technology   unpublished
Concrete, as a construction material requires laborious tests to determine its major properties namely, Strength and Durability. Several investigations are required for the specimen to be tested after being subjected to compression. However, in recent years, Remote-Sensing is used as a non-destructive method to determine any material for its structure and composition using its spectral reflectance signature (Spectral reflectance signature is the variation of emittance of materials with respect
more » ... rials with respect to its wavelength). Concrete contains lime (CaO) which reflects high in Visible Near-Infrared (VNIR) region and hence, it is possible to obtain differences in spectral reflectance for various grades of concrete due to differences in composition of the elements. The aim of this study is to determine the potential of remote sensing in characterising the compressive strength of concrete using remote sensing measurements. Conventional concrete grades used in this study are M20, M25 and M30. The compressive strength of three different grades at different periods of curing, i.e., 7 days, 14 days and 28 days are determined and assessed. Tested sample cubes are then used to measure the reflectance using spectro-radiometer in the VNIR region. Spectral reflectance curves of the concrete samples were generated and it was observed that it is possible to relate the compressive strength of concrete with remote sensing measurements in a qualitative manner. In addition, the indices created using 450 nm, 600 nm and 880 nm were used to validate the results.