Most
people don’t realize that durability and strength are not
synonymous when
talking about concrete. Durability is
the ability to maintain integrity and
strength over time. Strength is only a measure of the ability to
sustain loads
at a given point in time.
Two
concrete mixes with equal cylinder breaks of
4,000 psi ( 28 N/mm2) at 28 days can vary widely
in their permeability,
resistance to chemical attack, resistance to cracking and general
deterioration
over time — all of which are important to durability.
Fly
ash concrete is much
more durable than normal concrete due to:
Reduced
corrosion: By decreasing concrete permeability, fly ash
can reduce the rate of
ingress of water, corrosive chemicals and oxygen — thus
protecting steel
reinforcement from corrosion and its subsequent expansive result.
Reduced
Shrinkage: The largest contributor to drying shrinkage is
water content. The
lubricating action of fly ash reduces water content and drying
shrinkage.
Reduced
Heat of Hydration: Click Here
to know more…
Reduced
Alkali Silica Reactivity: Click Here to know
more…
Increased
Resistance to Freezing and Thawing: Click Here to know
more…
