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EXPERTISE // LABORATORIES // TESTING STANDARDS

Petrographic Examination of Hardened Concrete

ASTM C856

This practice outlines the standard procedures for performing petrographic examination of hardened concrete samples. The samples examined may be taken from concrete constructions, that is, all sorts of objects, units, or structures that have been built of hydraulic cement concrete. They may also be concrete products or portions thereof, or concrete or mortar specimens that have been exposed in natural environments or simulated service conditions, or subjected to laboratory tests. This practice applies to samples of all types of hardened hydraulic-cement mixtures, including concrete, mortar, grout, plaster, stucco, terrazzo, and the like. The equipments generally used for specimen preparation are diamond saw, cutting lubricant, horizontal lap wheels, free abrasive machine, polishing wheel, hot plate or oven, prospector's pick and/or bricklayer's hammer, abrasives, plate-glass squares, suitable media, and microscope slides. For specimen examination, the equipments needed are stereomicroscope, dollies, petrographic or polarizing microscope, metallographic microscope, eyepiece micrometer, stage micrometer, microscope lamps, needleholders and points, bottles with droppers, assorted forceps, lens paper, refractometer, and immersion media. Appropriate procedures for the sampling, preparation, and examination of specimens are detailed methodically.

WJE laboratories are accredited by AASHTO (R18) and ANAB (ISO/IEC 17025) to perform testing standard ASTM C856 for Petrographic Examination of Hardened Concrete. Contact us to learn more.

Keywords

ASTM C856 - Aggregates - Alkali-Aggregate Reaction - Building Products - Concrete Products - Degradation/Deterioration - Hardened Concrete - Hydraulic Cement - Microscopy - Petrography - Porosity - Test Specimens and Test Engines

ICS CODE

91.100.30 (Concrete and concrete products)

UNSPSC CODE

30111500 (Concrete and mortars)

CITATION FORMAT

ASTM C856-18a, Standard Practice for Petrographic Examination of Hardened Concrete, ASTM International, West Conshohocken, PA, 2018, www.astm.org

Wiss, Janney, Elstner Associates is committed to helping our clients solve, repair, and avoid problems in the built world. Supported by unparalleled laboratory and field testing capabilities, our team of engineers, architects, and materials scientists brings an enthusiasm for problem solving and a hands-on technical approach to every challenge.

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EXPERTISE // LABORATORIES // TESTING STANDARDS