But the liveliest discussion centered on what type of concrete to use.
The most common type of concrete canal construction is by slip forming.
"Steel is often used as a reinforcing agent for this type of concrete, and is very energy-intensive.
Asked whether the wrong type of concrete had been used the first time around, Foerder said: "I wouldn't say it was the wrong type of substance.
Niagara Mohawk wants to stabilize the station by filling it with a type of concrete that can be removed if someone takes over the site.
"We are still waiting for some type of concrete outcome of this meeting, but we cannot wait too long," he said afterwards.
Known as additive manufacturing, concrete printing is one such example whereby a specific type of concrete, which has been developed for the process, is deposited in layers very precisely under computer control.
So far, it has performed proof-of-concept demonstrations in Venezuela and Panama, and is preparing for more in Mexico, Canada, Argentina and America.Another new type of concrete is at an even earlier stage.
Table 8 Slump and air content of each type of concrete.
Indeed, a type of concrete that cures instantly — and has the strength and stiffness required to meet bridge design codes without rebar — will be key.
MPa−1 was produced; these values are among the lowest obtained for this type of concrete.
