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Published in:
2020 | OriginalPaper | Chapter
Study of the Mechanical Properties of the Sand Concrete Lightened by Lignocellulosic Materials
Authors : B. Belhadj, A. Goullieux, M. Bederina, N. Montrelay, M. Quéneudec
Published in: Proceedings of the 4th International Symposium on Materials and Sustainable Development
Publisher: Springer International Publishing
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Abstract
The article aims to study the mechanical properties of the studied concretes, namely sand concrete without lignocellulosic materials (SC), sand concrete lightened by barley straw which content is 15 kg/m3 (BSC), sand concrete lightened by barley straw and wood shavings which content is 35 kg/m3 (BWSC) and sand concrete lightened by wood shavings which content is 60 kg/m3 (WSC). The objective is to target the best composition of the three lightweight sand concretes, which constitutes the best compromise between the studied properties. The first part was devoted to study the mechanical properties, namely the flexural strength, compressive strength, elasticity modulus in flexion and elasticity modulus in compression. However, the second part was reserved to study the cracking analysis of studied concretes by video microscope in order to appreciate the lignocellulosic materials effect on toughness and ductility.
The results show that as the content of lignocellulosic materials increases, the mechanical properties decrease as was predictable. Another relation was found between the porosity accessible to water and the compressive strength of the studied concretes. This relation was defined according to a polynomial equation whose correlation coefficient approaches 1. The cracking analysis shows the advantageous barley straw effect, separate and in combination for cracking propagation compared to wood shavings alone. Nevertheless, the advantage is in favour of concrete (BSC), from the point of view of improving the deformation capacity of concrete, that is to say ductility and toughness, this is mainly due to the particularity of barley straw in terms of tensile strength, straw flexibility, geometric shape and surface appearance. This barley straw particularity is an advantage compared to the wood shavings, it may contribute favourably to improve the ductility and consequently to increase the propagation resistance of the crack.