Simply put, EFC is traditional concrete that uses no ordinary Portland cement. Instead, EFC uses a geopolymer binder system made from the chemical activation of two industrial waste by-products - blast furnace slag (waste from iron production) and fly ash (waste from coal fired power generation).
The deflection and cracking behavior of concrete structure depend on the flexural tensile strength of concrete. Many factors have been shown to influence the flexural tensile strength of concrete, particularly the level of stress, size, age and confinement to concrete flexure member, etc.
An all-female team of engineers in Gaza have invented an affordable way to produce concrete from the rubble of homes destroyed during the last war in Gaza. The women aspire to create a needed alternative to the expensive and time-consuming process of importing construction materials into Gaza through the Israeli blockade.
Concrete, usually Portland cement concrete, is a composite material composed of fine and coarse aggregate bonded together with a fluid cement (cement paste) that hardens over time—most frequently a lime-based cement binder, such as Portland cement, but sometimes with other hydraulic cements, such as a calcium aluminate cement.