Valorization of agricultural waste: Pozzolanic properties of cassava peel ash and effects on the durability of cementitious materials

Abstract

Ash from cassava peeling, a byproduct of its processing, is rich in pozzolanic properties, making it a promising material for improving concrete durability. This study evaluates the physical (workability), hygrometric (water absorption), and mechanical (compressive and flexural strength) properties of concretes in which cement is replaced by ash (0%, 5%, and 10%) to assess the performance of cementitious elements containing ash. The results indicate that incorporating up to 10% ash reduces the compressive and flexural strength of the concrete by approximately 11.67% and 11.36%, respectively. The concrete also becomes 20.58% more porous, with a 41.18% reduction in its consistency (slump). Strength, water absorption, and slump follow a second-degree polynomial distribution as a function of ash content and concrete age. These results contribute to the development of environmentally friendly building materials suitable for structural elements where strength is less critical. However, these concretes are very useful for constructing drainage systems and for production methods requiring rapid demolding.