Abstract
This study uses Sasol ashes as cement extenders to contribute to the technology of partially replacing Portland cement by mass. There are two types of Sasol ashes; coal gasification ash (CGA) and weathered fly ash (WFA) produced from low grade coal. These ashes are disposed of by Sasol with no specific utilisation. In this investigation, PC will be partially replaced by mass with WFA, CGA and FA at 10%, 15% and 30% proportions for each type of ash. The durability indices will be measured and compared for all blended specimen (PC/WFA, PC/CGA and PC/FA). A 100% Portland cement specimen will be used as a control. The durability properties will be used to determine the potential of Sasol ashes being used as a cement extender.
Highlights
Concrete is a commonly-used construction material, known for its strength and durability properties
The Oxygen Permeability Index (OPI) test consists of measuring the pressure decay of oxygen passing through a 30-mm thick slice of a 68 to 70-mm diameter core of concrete placed in a falling head permeameter
Sasol Ashes are expected to exhibit similar fresh and hardened properties to fly ash (FA) when used as cement extenders
Summary
Concrete is a commonly-used construction material, known for its strength and durability properties. The construction industry and its stakeholders have recognised the necessity to reduce CO2 emissions caused by the production of PC This will subsequently minimize the rate of CO2 saturation in the atmosphere, combating global warming. Sasol ashes are by-products from the gasification and combustion processes carried out on coal. Sasol Ltd is interested in determining positive utilization of the Sasol ashes This investigation will replace 10, 15 and 30% of PC by mass with WFA, CGA, and FA. Measuring the durability of the specimen assist in determining if Sasol ashes are suitable as cement extenders
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
