Unstabilized rammed earth: Characterization of material collected from old constructions in south portugal and comparison to normative requirements

  • Gomes M
  • Gonçalves T
  • Faria P
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Abstract

Unstabilised rammed earth is a recyclable, economical and eco-friendly building material, used in the past and still 19 applied today. Traditionally, its use was based on a long empirical knowledge of the local materials. Because this 20 knowledge was mostly lost or is no longer sufficient, in many countries normative documents have been produced to 21 allow the assessment of rammed earth soils. With the aim of contributing for a refining of these normative 22 requirements, this article presents a research work that included: (i) collection of unstabilised rammed earth samples 23 from six constructions in Portugal; (ii) a literature survey of normative and complementary documents to identify the 24 most mentioned key-properties, the test procedures and the corresponding threshold limits; (iii) a discussion of the test 25 procedures and of the thresholds limits in the light of the experimental results. The analyzed properties are the particle 26 size distribution, maximum particle size, plasticity, compaction, linear shrinkage, organic content and salt content. The 27 work highlights the advantages of taking into account the characteristics of existing constructions as a basis for the 28 establishment and further refining of consistent threshold values. In particular, it shows that it is essential to adjust the 29 requirements to the specificities of local materials

Author-supplied keywords

  • earth construction
  • normative documents
  • requirements
  • soil properties
  • unstabilized rammed earth

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