Sustainable Partial Cement and Water Replacement in Concrete Using PFA and Super Plasticiser
| Main Authors: | Franco Muleya, Sunday Nwaubani |
|---|---|
| Format: | Article |
| Bahasa: | eng |
| Terbitan: |
, 2016
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/3530976 |
Daftar Isi:
- Cement is an important material used in the production of many concrete based building elements. Despite its importance, the production costs and unit price are high. Cement is also a potential hazardous material. This experimental study considered the effect of partially replacing cement content in concrete by 30% with Pulverised Fuel Ash (PFA) referred to as fly ash. The study further considered the effect of introducing 4% Superplasticiser (SP) to the OPC based concrete. Three different mix designs where formulated. The first one was based on Ordinary Portland Cement (OPC) as a control mix; the second mix was based on Ordinary Portland Cement mixed with PFA while the third one had Ordinary Portland Cement and Superplasticiser (SP). Results indicated that introducing 30% PFA to the OPC based mix reduced the concrete compressive strength at 28 days by an average of 27% for low water cement ration concrete. Adding superplasticiser to the OPC based concrete reduced the concrete compressive strength by 7%. The study concluded that replacing up to 30% of cement in concrete with PFA could reduce concrete production costs on a project while retaining the acceptable levels of concrete strength, density and workability. Adding superplasticiser showed that the water content can be significantly reduced with minimal effect on concrete strength and density. The superplasticiser showed significant effect on the concrete workability