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AssigneeUnited Arab Emirates University
InventorsHilal El-Hassan, Karim Hassan, Jad Bawab, Tamer El-Maaddawy
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A novel method for producing WPA concrete utilizing wastepaper sludge ash as partial replacement of cement. The method comprises mixing ordinary Portland cement (OPC), waste paper ash (WPA), aggregates, and water, followed by accelerated carbonation curing within 24 hours of mixing to produce WPA concrete. The method is carried out in a sealable carbonation chamber equipped with a safety valve. The carbonation-cured WPA-OPC blended concrete of the present invention can be used in precast construction applications to mitigate the adverse environmental impact of carbon emissions attributed to cement production while recycling waste paper and meeting construction performance requirements.
A method for producing concrete, the method comprising mixing ordinary Portland cement (OPC), waste paper ash (WPA), aggregates, and water to produce WPA concrete, wherein the WPA concrete is then exposed to accelerated carbonation curing for about 8 hours to about 20 hours in a carbonation chamber within about 24 hours from the time the WPA concrete is produced to obtain carbonation-cured WPA concrete, wherein the binder-to-aggregate ratio used is between about 1:5 and about 1:7, wherein the water-to-binder has a ratio between about 0.45 and about 0.55.
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