 Potsulans are materials that can be added to concrete to increase its strength and durability. Natural potsulans such as pumice have been found to be effective substitutes for artificial potsulans like fly ash, which are often produced from coal combustion. Pumice has been shown to provide comparable strength to concrete made with conventional Portland cement when used at 10-20% replacement levels. This suggests that pumice could be used as a cost-effective alternative to fly ash while still providing the same level of performance. This article was authored by Mohamed Ahefny and Daniel McAlliff.