Introduction

There is a great deal of kaolin in the Earth’s crust, which can fulfil the global demand for ceramic, filler and paper industries. After suitable calcination, kaolin can be transformed into an amorphous material with pozzolanic activity known as metakaolin (MK). Due to its stable properties, fineness and reactivity, MK can replace part of Portland cement (PC) to improve its fire resistance, durability and mechanical properties. Due to its richness in alumina and silica, MK is widely used as a precursor for geopolymers. Recently, several experiments have been carried out to incorporate MK into different types of geopolymers to achieve improved properties. Incorporating MK into geopolymers could have either a beneficial effect or a detrimental effect. This primarily depends on precursor type/fineness, MK ratio/fineness, activator type/concentration, Si/Al ratio, Si/Na ratio, curing condition and testing age. This book aims to summarize and evaluate the available studies focused on how MK affects the properties of geopolymers.