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Investigating porous concrete with improved strength: Testing at different scales

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Author: Agar-Ozbek, A.S. · Weerheijm, J. · Schlangen, E. · Breugel, K. van
Type:article
Date:2013
Source:Construction and Building Materials, 41, 480-490
Identifier: 470987
doi: doi:10.1016/j.conbuildmat.2012.12.040
Keywords: Architecture · Porous concrete · Macro-scale testing · Meso-scale testing · Interfacial transition zone · Compaction · Aggregate properties · Computed tomography · Aggregate properties · Compaction · Computed tomography · Interfacial transition zone · Macro-scale testing · Meso-scale testing · Porous concrete · Aggregate properties · Computed Tomography · Interfacial transition zone · Macro scale · Mesoscale · Porous concretes · Compaction · Computerized tomography · Design · Mechanical testing · X ray diffraction analysis · Concrete mixtures · Defence Research · Defence, Safety and Security · Mechatronics, Mechanics & Materials · EBP - Explosions, Ballistics & Protection · TS - Technical Sciences

Abstract

Porous concrete incorporates a high percentage of meso-size air voids that makes its mechanical characteristics remarkably different from normal concrete. A research project was undertaken to design a special type of porous concrete, that fractures into small fragments when exposed to impact loading while having sufficient static strength, to be used in protective structures such as safety walls or storages for explosives. In the concretes designed, while a sufficient static strength was required, high porosity was essential to facilitate the formation of multiple cracks and the subsequent fracturing. Production of porous concretes having improved static compressive strengths was accomplished by modifying the mixture design and the compaction technique; while the design procedure was supported by macro and mesoscale mechanical testing, computed tomography, microscopy and X-ray diffraction analysis.