Physical Properties of Concrete Roof Tiles Containing Recycled Wood-wool and Quarry Dust as Partial Sand Replacement

Abstract

Concrete roof tile is an important building material that highly
demanding in construction sector. The production of wood-wool
concrete roof tiles (WWCRT) become an alternative in generating
sustainable material development and have its potential to be in
demanding market. WWCRT was a prototype of flat roof contained
grinded wood wool (CWWP) and quarry dust as partial sand
replacement with the addition of perlite and SP. The aim of this study is
to investigate the physical properties of WWCRT mortar and to identify
the optimum proportion of replacement material, water-cement ratio
and mix proportion of roof tile. The tests conducted were water
absorption of prism-shape mortar and water permeability of WWCRT
mortar. The results showed that the B15 of WWCRT mix with 15% and
10% proportion of CWWP and QD respectively achieved the lowest
water absorption rate which is 9.9% and this is the optimum percentage
in producing a low-density roof mortar as its density of 28-day of curing
is 1567 kg/m3. For water permeability rate by uncoated WWCRT, B15
showed the lowest rate as the water seeping in 1-hour test only up to 38
mm depth. WWCRT with surface coating enhanced the performance of
this test as all coated roof batches resulted nearly null of water
permeability rate. Therefore, the proportion of CWWP and QD affected
the physical behaviour of mortar.