Abstract
An investigation was conducted to study the viability of using waste paper pulp ash as an alternative material applied as a partial replacement of cement in the manufacturing of concrete and its effect on the properties of concrete, and also, the cost and environmental advantage of using waste paper were examined. Four concrete mixes with 0%, 5%, 10%, and 15% waste paper pulp ash replacement of OPC and PPC for 25 MPa concrete were prepared. Based on the results obtained from the research, the highest compressive strength obtained at all test ages, i.e., 3, 7, and 28 days, were, 24.36, 28.35, and 36.83 MPa, respectively, with 5% replacement of waste paper pulp ash for OPC, and for PPC, all percentage replacements showed reduction in compressive strength than the control mix. The water absorption of concrete was increased with increasing the percentage of waste paper pulp ash than control concrete. The control concrete clearly has the lowest resistance to 2% sulfuric acid solution compared to blended concrete of OPC-WPPA and PPC-WPPA. The cost comparison indicates that the incorporation of waste paper pulp ash decreases the cost of concrete and WPPA and saves raw materials used in cement and concrete production.
Highlights
E ecosystem is affected by wastes released into the environment
E normal consistency for blended pastes of OPCWPPA and PPC-WPPA shows a small increment as a percentage of replacement of WPPA increase compared to the control paste, and the results were within the usual range of normal consistency of cement paste between 26% and 33% [16]. e paste containing waste paper pulp ash requires more water than control paste or paste without waste paper pulp ash. is is because of its porosity as compared to that of cement
The concentration of gypsum in the mixture became lower by increasing the WPPA replacement
Summary
E pretest results in the 3rd, 7th, and 28th days of concrete containing 5% waste paper pulp ash calcined at 500°C temperature for 2 hrs were greater than those of control mix, or there was improvement in strength. Erefore, ashing all the dried waste paper pulp were carried out by calcinations in a furnace at a temperature of 500°c for 2 hrs. It was cooled by air-dried cooling and packed in sacks. E effect of waste paper pulp ash on the properties of concrete was investigated using Dangote’s OPC 42.5 and PPC 32.5 cements complying with the requirements of Ethiopian standards Cement. e effect of waste paper pulp ash on the properties of concrete was investigated using Dangote’s OPC 42.5 and PPC 32.5 cements complying with the requirements of Ethiopian standards
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