Abstract:
This research investigates the effect of using wastewater from stone slurry waste on
concrete properties. The variables of the research are, type of water (tab, stone slurry
water, a-with flocculant, b- without flocculant), w/c ratio (0.5, 0.6 , 0.7) , type of tests
(slump, compressive , flexural tensile, and absorption), curing time (7,14,28 days) and
percent of wastewater replacement as substitute of tab water (30% and 100%).
27 concrete batches were prepared (over 240 samples were prepared). From each
concrete batch the following samples were casted: 6 cubes for compressive test, 2
cubes for absorption test after 28 days, one beam (10 cm x 10 cm x 50 cm) for flexural
tensile test after 28 days cuing. The experimental data were recorded as the average
of two sample tests after each curing age.
The test results revealed a decrease in slump of fresh concrete (workability) by using
wastewater in substitute of tab water.
The results showed that at w/c=0.7 the compressive strength of concrete after 28 day
curing didn’t affected significantly at replacement ratio of 30% and 100%. However,
at w/c of 0.5 and 0.6 a varying reduction of compressive strength were observed, at
different ages and replacement ratios of stone slurry wastewater were observed.
Analysis of the tests results showed that, at 20% replacement of tab water with stone
slurry wastewater, the range of reduction in compressive strength is within the
acceptable range of the ACI code for nontraditional mixing water.
For reinforced concrete stone slurry wastewater may be used at w/c =0.7and
replacement ratio(30% and 100%) for production of self-compacted concert , low
grade concrete or plane concrete .
