The Suitability of Recycled Domestic Wastewater in Plain Concrete Production.
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Date
2023
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Kabale University
Abstract
Concrete production is one of the activities that use a lot of water in its mix but fresh potable water is greatly reducing due to highly increasing population and industries in the world. Therefore, there is need for identifying alternative sources of water which one of them is recycling wastewater to be used for concrete production. This project therefore sought to evaluate the suitability of recycled domestic wastewater in concrete production for use.
The project involved concrete of classes M10, M15, M20, mixing water was fresh water (FW)/portable water for control experiment, and then replaced FW with domestic wastewater that is preliminary wastewater (PWW), primary treated wastewater (PTWW) and secondary treated wastewater (STWW) for test experiments.
Results indicated that the slumps for M10 concrete were between 38 and 42mm concrete mixed with fresh water having the same slump with that mixed with secondary treated wastewater, for M15 concrete were between 33.7 and 46, concrete mixed with fresh water having 4mm slump that that mixed with secondary treated wastewater, and for M20 concrete were 40.3 and 44, concrete mixed with fresh water having 0.7mm slump less than that mixed with secondary treated wastewater
The compressive strength of concrete mixed with secondary treated wastewater was in close proximity with that produced with fresh water mixed concrete, that mixed and cured by fresh/portable water being slightly higher than that mixed and cured by treated wastewater but the difference was very small. For concrete grade M10, concrete mixed with FW had 79% compressive strength while one mixed with STWW was76.5%, it was 2.5% less than concrete mixed and cured by FW at 28 days. For concrete grade M15, concrete mixed with FW had 72% compressive strength while one mixed with STWW was 72.4%, it was 0.4% greater than concrete mixed and cured by FW at 28 days. For concrete grade M20, concrete mixed with FW had 73% compressive strength while one mixed with STWW was 73.3%, it was 0.3% greater than concrete mixed and cured by FW at 28 days.
The compressive strength for concrete mixed with freshwater and secondary treated wastewater exceeded the characteristic strength but did not reach the target mean strength at 28 days probably because of environmental conditions such as temperature where the cubes were casted from which were not controlled, but it was ok since it was greater than the characteristic strength.
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Orishaba, James (2023). The Suitability of Recycled Domestic Wastewater in Plain Concrete Production. Kabale Kabale University.