ASTM C856/C856M-20 PDF Download
Standard EN Sample
Standard Practice for Petrographic Examination of Hardened Concrete
Also Known As:
ASTM C856/C856M-20 is a standard practice that specifies the procedures for conducting petrographic examination of hardened concrete samples. It covers samples taken from various sources, such as concrete constructions, concrete products, and concrete or mortar specimens exposed to different environments. The standard applies to all types of hardened hydraulic-cement mixtures, including concrete, mortar, grout, plaster, stucco, and terrazzo.
The standard outlines the necessary equipment for specimen preparation, which includes a diamond saw, cutting lubricant, lap wheels, polishing wheel, hot plate or oven, hammers, abrasives, microscope slides, and more. For specimen examination, equipment such as stereomicroscopes, petrographic or polarizing microscopes, metallographic microscopes, micrometers, refractometers, and various tools for handling samples are required.
The standard emphasizes the importance of proper sampling, preparation, and examination of specimens. It provides detailed procedures for each step, including qualifications of petrographers and the use of technicians. The purposes of the petrographic examination are also discussed, along with the selection and use of apparatus, specimen preparation, visual and stereomicroscope examination, polarizing microscope examination, and reporting of findings.
| Descriptors | air voids, petrographic examination, concrete specimens, mortar specimens, construction materials, deterioration, alkali-silica reaction,Aggregates,Concrete Products,Hardened Concrete,Hydraulic Cement,Alkali-Aggregate Reaction,Building Products,Degradation/Deterioration,Microscopy,Petrography,Porosity,Test Specimens and Test Engines |
| ICS Codes | 91.100.30 - Concrete and concrete products |
| Language(s) | English |
| File Size | 184.3 KB |
