Optimisation of Compressed Earth Blocks (CEBs) using natural origin materials: A systematic literature review
Chiara Turco, Adilson de Paula, Elisabete Teixeira, Ricardo Mateus
Abstract
A Systematic Literature Review (SLR) on the effect of the optimisation of Compressed Earth Blocks (CEBs) using natural origin materials was made in this paper. The purpose of the study is to offer a clearer vision of recent scientific developments on the topic by addressing a number of specifically formulated research questions. To this end, 45 journal articles and conference proceedings were selected following some inclusion criteria, i.e., the raw material (soil), shape (block), methods of compaction (mechanical or hydraulic press), preparation (unfired), the addition of natural origin materials (fibres, powders or ashes). Through a holistic approach, a discussion on the main physical, thermal, mechanical, and durability properties was conducted to find correlations and criticisms. Preliminary considerations are drawn on the sound insulation and fire resistance properties and on the economic performance and environmental impact of optimised CEBs, opening a brief discussion on some sustainability indicators. The research outcomes may encourage researchers to find new solutions to improve the proprieties of earth building materials to promote their broader use and more sustainable buildings.