Next Article in Journal
Preparation of Micro/Nano-Structure Copper-Substituted Hydroxyapatite Scaffolds with Improved Angiogenesis Capacity for Bone Regeneration
Next Article in Special Issue
Experimental and Numerical Analyses of Temperature-Reducing-Effect by Heat of Water Evaporation on a Moss-Greening Ceramic Utilizing Waste Silica
Previous Article in Journal
Experimental and Numerical Assessment of Temperature Field and Analysis of Microstructure and Mechanical Properties of Low Power Laser Annealed Welded Joints
Previous Article in Special Issue
The Effect of Particle Shape on Sintering Behavior and Compressive Strength of Porous Alumina
Open AccessArticle

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

1
Departamento de Ingeniería Mecánica y Minera, Universidad de Jaén, Campus Científico-Tecnológico de Linares, Cinturón Sur s/n, 23700 Linares (Jaén), Spain
2
Departamento de Ingeniería Civil: Construcción, E.T.S de Ingenieros de Caminos, Canales y Puertos, Universidad Politécnica de Madrid, C / Profesor Aranguren, s/n, 28040 Madrid, Spain
3
Departamento de Vehículos Aeroespaciales, E.T.S. Ingeniería Aeronaútica y del Espacio, Universidad Politécnica de Madrid, Plaza Cardenal Cisneros 3, 28040 Madrid, Spain
*
Author to whom correspondence should be addressed.
Materials 2018, 11(9), 1515; https://doi.org/10.3390/ma11091515
Received: 13 July 2018 / Revised: 17 August 2018 / Accepted: 20 August 2018 / Published: 23 August 2018
(This article belongs to the Special Issue Advanced Porous Ceramics and Its Applications)
The determination of the parameters that characterize 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 that is described in the Standard that makes use of macro photography. This alternative procedure uses macro-photographic images that can be obtained with a quite standard photo camera and it 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. View Full-Text
Keywords: freezing and thawing; concrete; durability; spacing factor; pore characterization freezing and thawing; concrete; durability; spacing factor; pore characterization
Show Figures

Figure 1

MDPI and ACS Style

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.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop