Fatemeh Faghih Khorasani - PhD student, Department of Civil Engineering, University of Amirkabir, Tehran, Iran
Z Kabir Mohammad - Full Professor, Department of Civil Engineering, University of Amirkabir, Tehran, Iran
M.A Rastak - MSc. student, Department of Mechanical Engineering, University of Science and Technology, Tehran, Iran

According to the evidence of low polluting and sufficient thermal, humidity and acoustic insulating of the soilblocks, there is an increasing interest to study earthen building for sustainable development. By the way, the adobestrength is strongly affected by its composition, compacting type and curing. This study tries to investigate directly andindirectly the tensile properties of two different mix designed adobe (plain adobes and tire fibers reinforced adobes)with constant soil type, water content and compacting type. All the adobes were made by cutting the adobe ingotsproduced by spiral compacting machine. A number of direct tension and three points bending tests were carried out onadobe specimens. For every type of adobes, the mechanical properties in direct tension and three points bending testsincluding the estimation of tensile Young modules and the peak strength and its associated normal strain weremeasured. The experimental observations were attained using Digital Image Correlation (DIC) data from an acquired2-D DIC system (Ncorr, Matlab software). Finally, the direct and indirect tensile properties of adobes were comparedand the effectiveness of short fibers were also investigated.

Adobe, Direct tension behavior, indirect tension behavior, Digital Image Correlation, Toughness index