Preprint Article Version 1 This version is not peer-reviewed

Macro Photography as an Alternative to the Stereoscopic Microscope in the Standard Test Method for Microscopical Characterisation of the air-void System in Hardened Concrete: Equipment and Methodology

Version 1 : Received: 13 July 2018 / Approved: 14 July 2018 / Online: 14 July 2018 (17:23:13 CEST)

A peer-reviewed article of this Preprint also exists.

Suárez, F.; Conchillo, J.J.; Gálvez, J.C.; Casati, M.J. Macro Photography as an Alternative to the Stereoscopic Microscope in the Standard Test Method for Microscopical Characterisation of the Air-Void System in Hardened Concrete: Equipment and Methodology. Materials 2018, 11, 1515. Suárez, F.; Conchillo, J.J.; Gálvez, J.C.; Casati, M.J. Macro Photography as an Alternative to the Stereoscopic Microscope in the Standard Test Method for Microscopical Characterisation of the Air-Void System in Hardened Concrete: Equipment and Methodology. Materials 2018, 11, 1515.

Journal reference: Materials 2018, 11, 1515
DOI: 10.3390/ma11091515

Abstract

The determination of the parameters that characterise the air-void system in hardened concrete elements becomes crucial for structures under freezing and thawing cycles. The ASTM C457 standard describes some procedures to accomplish this task, but they are not easy to apply, require specialised equipment such as a stereoscopic microscope and result in highly tedious tasks to be performed. This paper describes an alternative procedure to the modified point-count method described in the Standard that makes use of macro photography. This alternative procedure is successfully applied to a large set of samples and presents some advantages over the traditional method, since the required equipment is less expensive and provides a more comfortable and less tedious procedure for the operator.

Subject Areas

Freezing and thawing; Concrete; Durability; Spacing factor; Pore characterisation

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