Abstract:
This research investigated the possibility of
ceramic wastes such as deteriorated working mold (DWM) and
biscuit as a coarse and fine aggregate in lightweight aggregate
concrete (LWAC), which divided to two parts; effect of coarse
aggregate (CA) replacement with DWM and effect of biscuit
replacement fine aggregate (FA)on properties of LWAC.The
ratio of ordinary Portland cement (OPC): FA: CA are 1: 2.21:
3.03 and replaced CA with DWM and FA with biscuit at the
levels of 0, 25, 50, 75 and 100 wt.%. All conditions of LWAC
were tested for compressive strength at 7, 14, 28 and 56 days,
unit weight, water absorption and thermal conductivity at the
age of 28 day. The results showed that increasing the levels of
DWM decreased density and compressive strength but
increased the water adsorption and thermal conductivity. At 28
days, the compressive strength and bulk density of LWAC
decreased from 55.4 to 11.4 MPa and 2394 to 1362 kg/m3 with
increasing of DWM replaced CA from 0 to 100 wt.%. The
optimum ratio of lightweight aggregate concrete with DWM
was the level of 50 wt.% that gave the compressive strength and
density at 28 days of 38.1 MPa and 1803 kg/m3 respectively.
This mix was collected to study the effect of biscuit replaced FA
on mechanical properties. The compressive strength increased
when levels of biscuit increased from 0 to 50 wt.% but
decreased with the levels of biscuit excess 50 wt.%. The bulk
density and thermal conductivity decreased from 1803 to 1584
kg/m3 and 0.689 to 0.592 W/m°K. The optimum mix of LWAC
was found in LWAC containing 50 wt.% of DWM and 100
wt.% of biscuit that meet the ASTM C330: standard range for
structural lightweight aggregate concrete.
