Hydration Research Paper

931 Words4 Pages

2.3 Hydration of cement
Chemical reactions that takes place while mixing cement with water is known as hydration of cement
When cement is mixed with water, a certain amount of heat is liberated which is known as heat of hydration. This reaction is exothermic reaction.
On account of hydration various products are formed. Different compounds hydrates at a different rate and liberate different quantity of heat
• Tricalcium silicate, C3S- early heat of hydration is mainly due to the formation of this compound.
• Dicalcium silicate, C2S-responsible for later strength in concrete
• Tricalcium aluminates, C3A
• Tetra calcium aluminoferrite, C4AF
• Gypsum, C-S-H
Chemical reactions during hydration On mixing water to cement,the following reaction …show more content…

• When tricalcium aluminates and ettringnite combines in the presence of water, monusulphate aluminate hydrate is formed

2C3A + 3 C6AS3H32 + 22H 3C4ASH18 (monosulphate)
• Two types of reactions are formed when tetra calcium alumino ferrite reacts with gypsum: In the first of the reactions, the ettringite reacts with the gypsum and water to form ettringite, lime and alumina hydroxides, …show more content…

Where S.D. = Standard Deviation which is obtained by tables 4 & 5 given below according to the conditions demanded Fck = target mean strength fck = Characteristic compressive strength at 28 days t = tolerance factor Table 4: Assumed Standard deviation for different grades of

More about Hydration Research Paper

Open Document