Hydration hardening chemical modifiers

Cement hydration and epoxy polymerization occur simultaneously to form a structure that is similar to the latex-modified cementitious system. Epoxy systems develop high strength, adhesion and have low permeability, good water resistance and chemical resistance. A major advantage of this system is that it can be cured under moist or wet conditions. According to a recent study, the epoxy-modified mortars can be made without the hardeners with superior properties to those obtained with conventional epoxy mortars [89, 90]. 

Pastes made from plaster of Paris exhibit fast setting and hardening, and the hydration process is typically completed within hours. Small amounts of chemical additives may be added to the calcined material to modify its properties. These may include set accelerators (such as soluble sulfates or prehydrated plaster), set retarders (such as citric acid or ker-atin), or modifiers of rheology (such as methyl cellulose or caibo methyl cellulose). 

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