4.7 Article

Fracture behavior of rammed earth in historic buildings

Journal

CONSTRUCTION AND BUILDING MATERIALS
Volume 289, Issue -, Pages -

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2021.123167

Keywords

Rammed earth; Fracture behavior; Ultrasonic test; Historical structures

Funding

  1. European Regional Development Fund Programme of Andalucia 2014-2020 [A-TEP-182-UGR18]
  2. project PREFORTI - Agencia Estatal de Investigacion (Spanish National Research Agency) [BIA2015 69938-R]
  3. European Regional Development Fund

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Ramned earth, as a construction system for traditional buildings, still lacks sufficient research on its fracture behavior, with even fewer studies considering lime as a stabilizer. This study measured the density, ultrasonic pulse velocity, fracture energy, and tensile strength of rammed earth specimens with different soil:lime dosages, and found relationships between these parameters and the dosages used. It was also found that the fracture behavior of rammed earth can be considered similar to that of mass concrete from a qualitative perspective.
Rammed earth is the construction system of many heritage structures and buildings in different regions of the planet, some of which are seismically active areas. For this reason, these historic buildings can sustain structural damage or have already been subjected to stresses that have led to high levels of cracking in the rammed earth walls. Therefore, knowledge of the fracture behavior of this material is essential to assess the actual state of structural safety and the remaining mechanical capacity. The number of studies on the fracture behavior of rammed earth is limited, and even fewer studies have considered lime as a stabilizer and used traditional materials. This study measured the density, ultrasonic pulse velocity, fracture energy and tensile strength of prismatic specimens with two different soil:lime dosages and found relationships between the different parameters analyzed and the dosages used. Finally, it was verified that the fracture behavior of rammed earth can be assumed to be similar to that of mass concrete from a qualitative standpoint. For this reason, rammed earth could be considered as a quasi-brittle material that follows Hillerborg's discrete crack model. (c) 2021 Elsevier Ltd. All rights reserved.

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