DefinePK

Abstract

In this paper, the flexural strength of recycled aggregate concrete that used saw dust ash instead of some part of cement is studied. Recycled aggregates are taken from broken construction waste and mixed in same amount like normal aggregates. Saw dust ash was made by burning wood at 1200°C. A 1:2:4 mixture and water-cement ratio of 0.5 was taken to make the prism shapes (100mm x 100mm x 500mm). Cement was changed from 0% to 10% slowly by 1% each time. Another set using only normal aggregates was also made so we can see the difference with the new concrete. How easy the mix was to work with was checked using slump test. There were 33 prisms in total and flexural test was done using central point loading. Central deflection at maximum sustained load was also recorded. The results showed that when 5% saw dust ash is used, the leftover flexural strength is 91% and deflection comes down by 74%. Also, when more saw dust ash was added, it helped to control the beam bending better.