Evaluating shear test methods for stabilised rammed earth

Author:

Cheah Jing Siong John1,Walker Pete2,Heath Andrew3,Morgan Te Kipa Kepa Brian4

Affiliation:

1. PhD student, Department of Civil and Environmental Engineering, University of Auckland, Auckland, New Zealand

2. BRE Trust Chair and Director, BRE Centre for Innovative Construction Materials, Department of Architecture and Civil Engineering, University of Bath, Bath, UK

3. Senior Lecturer, BRE Centre for Innovative Construction Materials, Department of Architecture and Civil Engineering, University of Bath, Bath, UK

4. Senior Lecturer, Department of Civil and Environmental Engineering, University of Auckland, Auckland, New Zealand

Abstract

Rammed earth is an accessible, sustainable and increasingly popular building material. Owing to a lack of research, current design standards for rammed earth have taken a conservative stance on material attributes like shear strength. Evaluating the shear strength of rammed earth is particularly important in seismic areas because of the material's high mass, low ductility and propensity to fail in shear. Shear test methods designed for other materials have typically been used in practice to determine the shear strength of rammed earth. In this research the design shear strength guidance available in current earth building standards was compared with experimental shear strength results for stabilised rammed earth. The triaxial (geotechnical) and triplet (masonry) tests were used to evaluate specimens reinforced with natural fibres: sisal and New Zealand flax. Both shear test methods showed that the shear strength capacity of cement-stabilised rammed earth was greater than the current guidance provided in the earth building standards. Recommendations were made to use the triaxial test to evaluate the shear strength of stabilised rammed earth and to allow the use of design shear strength equal to 7% of the compressive strength.

Publisher

Thomas Telford Ltd.

Subject

Mechanics of Materials,General Materials Science,Civil and Structural Engineering

Reference27 articles.

1. ASTM. E519-00: Test method for diagonal tension (shear) in masonry assemblages.2000, ASTM International, West Conshohocken, PA, USA.

2. BSI. BS1377-8: Methods of test for civil engineering purposes – Part 8: shear strength tests (effective stress).1990, BSI, Milton Keynes, UK.

3. BSI. BS EN 1052-3: Methods of test for masonry. Determination of initial shear strength.2002, BSI, Milton Keynes, UK.

4. Performance of composite soil reinforced with barley straw

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