Why is it so important to use additives with mortars and concrete? Are additives necessary?
Additives make mortars and concretes easier to use and improve all round performance. Each additive is designed to perform a specific function and modify a specific characteristic of the mixture to which it is added. There are therefore additives for a wide range of functions. Here are a few: improving chemical, physical and mechanical strength and resistance; increasing impermeability; increasing fluidity; reducing water shrinkage; accelerating drying and hardening; making material suitable for use in critical temperatures.