Engineered cementitious composite Totally Explained

Everything about Engineered Cementitious Composite totally explained

Engineered Cementitious Composite, (ECC) is an easily molded and shaped mortar based composite reinforced with short random fibers, usually polymer fibers.
ECC, unlike common fiber reinforced concrete, is a micromechanically designed material. This means that the mechanical interactions between ECC's fiber, and matrix are taken into account by a micromechanical model which calculates these elemental properties into a strong and flexible composite material. ECC is made using the same ingredients of regular concrete but without the use of coarse aggregate. The University of Michigan has a research team whose ECC technology has been used on projects in Japan, Korea, Switzerland, Australia and the U.S. It has had a relatively slow adoption in the U.S. according to Professor Victor C. Li, who is the leader of U-M’s research team that's developing its own ECC. Traditional concrete's many problems: lack of durability, failure under severe strain, and the resulting expenses of repair, have been a pushing factor in the devolpment of ECC.

Comparison to other composite materials

Properties	FRC	Common HPFRCC	ECC
Design Methodology	N.A.	Use high Vf	Micromechanics based, minimize Vf for cost and processibility
Fiber	Any type, Vf usually less than 2%; df for steel ~ 500 micrometre	Mostly steel, Vf usually > 5%; df ~ 150 micrometre	Tailored, polymer fibers, Vf usually less than 2%; df < 50 micrometre
Matrix	Coarse aggregates	Fine aggregates	Controlled for matrix toughness, flaw size; fine sand
Interface	Not controlled	Not controlled	Chemical and frictional bonds controlled for bridging properties
Mechanical Properties	Strain-softening:	Strain-hardening:	Strain-hardening:
Tensile strain	0.1%	<1.5%	>3% (typical); 8% max
Crack width	Unlimited	Typically several hundred micrometres, unlimited beyond 1.5% strain	Typically < 100 micrometres during strain-hardening

Note: FRC=Fiber-Reinforced Cement. HPFRCC=High-Performance Fiber Reinforced Cementitious Composites

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