Natural pozzolans

Abstract

This chapter is dedicated to several kinds of natural pozzolans that occur around the globe and describes their specific characteristics, origin and use in concrete. Moreover, the advantages and disadvantages of their use in concrete mixes are highlighted in terms of concrete properties. In particular, the referenced properties in this chapter are that of fresh and hardened concrete, its microstructure and chemical durability. The chapter is summarized by mentioning the specifications concerning natural pozzolans according to the relative standards. Overall, the benefits of using natural pozzolans in cement and concrete are evident in terms of higher later age compressive strength, increased concrete durability, lower heat of hydration, reduced bleeding and others.