ASTM C1723-16 PDF Download

The ASTM C1723-16 standard provides guidance on the examination of hardened concrete using scanning electron microscopy (SEM) combined with energy-dispersive X-ray spectroscopy (EDX or EDS). This guide acknowledges that SEM has been a valuable tool for analyzing the microstructure of concrete since the 1960s. It supplements techniques of light microscopy described in Practice C856 and suggests referring to this practice for SEM analysis when applicable. The guide is intended to serve as a general introduction to the application of SEM/EDS analytical techniques for concrete examination and analysis. It is designed to be useful for engineers and scientists familiar with SEM/EDS technology but not necessarily experts in its operation and application.

The guide emphasizes the importance of the operator's familiarity with the SEM/EDX (EDS) equipment and specimen preparation procedures. It does not cover data interpretation, as it is best performed by individuals knowledgeable about the limitations and significance of SEM/EDX (EDS) and the materials being evaluated. The SEM provides images of concrete specimens (fragments, polished surfaces, powders) at various magnifications, revealing compositional and topographical variations. EDX (EDS) can be used to determine the elemental composition of small volumes intersecting the surface of the specimen, which can be correlated with specific features observed in the SEM image. The guide also acknowledges that performing SEM and EDX (EDS) analyses on hardened concrete may present unique challenges compared to other materials.