engleski

Effect of Sunflower Seed Shells Ash on Properties of Self-compacting Concrete

There are numerous researches in the field of civil engineering that attempt to find a possible application of biomass ash. The purpose of this study is to investigate the possible use of the sunflower seed shells ash as powder material in self-compacting concrete. Four mixtures of self-compacting concrete have been made and tested. In all the mixtures there were equal amounts of cement, the total amount of fines, additives and aggregates. The water to binder ratio is maintained 0.55 for all mixtures. The reference mixture is made with cement, silicate fume and stone powder. In two mixtures, a part of the stone powder was replaced with the sunflower seed shells ash and in the last mixtures, silica fume was replaced with fly ash. Mixtures were tested for air content and workability of the fresh concrete is determined by using V funnel method, slum flow, T 500, L - box, and visual check of stability. The dynamic modulus of elasticity and compressive strength were tested after 7 and 28 days. According to the obtained results, the higher ash content of the sunflower seed shells reduces the mechanical properties of the concrete and in the fresh state affects on the setting time. The workability depends on the ratios and types of powders. Specimens of lime mortar with the addition of sunflower seed shells ash were also made. The obtained results do not indicate that sunflower seed shells ash has pozzolanic activity.

sunflower seed shells ash, self-compacted concrete, workability, mechanical properties, pozzolanic activity

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