Reaction between cement and water and interfacial transition zone.
Reaction between cement and water is known as heat of hydration it is exothermic reaction .
cement contains four components known as Bouge components.
C2S- DI CALCIUM SILICATE
C3S- TRI CALCIUM SILICATE
C3A - TRI CALCIUM ALUMINATE
C4AF- TETRA CALCIUM ALUMINO FERRITE.
when water reacts with cement they formed calcium silicate hydrate,calcium hydroxide and calcium aluminte trisulphate hydrate( known as ettringite)or calcium aluminate monosulphate hydrate which is final product of cement and water reaction.
C- S-H is cementitious product useful for concrete but Calcium hydroxide and ettringite is harmful for concrete.
when C3S reacts with water is generate less C-S-H and more calcium hydroxide or more quantity of heat in comparison of C2S.
C3S causing initial strength for concrete where as C2S is causing gaining strength gradually for long time.
INTERFACIAL TRANSITION ZONE:
CONCRETE CONSIST MAINLY TWO ZONES
: PASTE PHASE ( LIQUID PHASE)
: SOLID PHASE
Third phase is known as Transition zone which is lies between above these phase.
when aggregate of concrete settle down water is trapped underneath of aggregate due to which water cement ratio of that perticular area increase this zone is known as transition zone which is weaker part of concrete causing cracks when load is applied and crackson is propagate from this zone to another zone and causing break of cube.
To minimise this zone we use POZZALANIC materials in concrete they are:
FLYASH
MICROSILICA
ALCOFINE
GGBFS
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