Abstract
As a result of the acceptance of pumice as advantageous and desirable natural lightweight aggregate, pumice is used in concrete and mortar for producing thermal insulation, fire resistance, freeze/thaw resistance, chemical resistance, less alkali-silica reaction (ASR) expansion and lightweight matrix. Adversely, the introduction of pumice aggregate in the matrix reduced mechanical strength, reduced workability, increased drying shrinkage and increased water absorption. Some methods are used to mitigate the negative impact of pumice aggregate on the matrix. In this work, the effect of pumice aggregate on fresh and hardened properties of conventional concrete and mortar as well as the different approaches to modify some defects of using this aggregate type are reviewed.