Physical and thermal properties of lightweight self-compacting mortar made with recycled walnut shells as fine agreggrates
Abstract
The aim of this work is to investigate the possibility of recycling Walnut Shell wastes (WS) as fine aggregates in lightweight self-compacting mortar (SCM). In the experimental procedure, the natural sand was partially replaced by the WS waste at various replacement ratios (0; 10; 20; 30 and 40%). The thermal conductivity and some physic-mechanical properties of the SCM containing WS were studied and compared with control SCM (CSCM). The test results showed that, depending on the amount of WS aggregate, unit weight and thermal conductivity of concrete were reduced and the capillary water absorption was increased with the use of WS aggregates and for all the lightweight SCMs considered. Moreover, reductions in mechanical properties of concretes have been obtained with decreasing concrete unit weights. In addition, substitution ratio of 30% was found to be the optimum volume ratio of WS for getting lightweight structural SCM with appropriate fresh and hardened properties.
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