$[2]$

e$)$ You formed a Concordia team to compete against other North American civil engineering schools in an ACI competition for producing high strength concrete. The final concrete mixture composited of cement, fly ash, sand, crushed coarse aggregate, admixtures and water. On the competition day, you have been told that the only available coarse aggregate is a round gravel. In your opinion, how changing the coarse aggregate from a crushed to a round gravel aggregate is going to affect the fresh properties of concrete? What adjustment would you do for the designed mixture?

$[2]$ f$)$ Joe would like to have a Sauna room in his new house. He contacted Mark to do this job and asked him to make a concrete seat inside the Sauna room. Mark refused and said that all seats inside the Sauna room must be made of wood. State two reasons that support Mark's decision?

Question No$.4[15$ Marks$]$

$[3]$ a$)$ A concrete masonry unit with a net volume of $0\mathrm{.}007m^3$ and has nominal dimensions of $102040cm($width $$ height $$ length$)$ was tested in a compression machine. The recorded failure load was $726kN.$ Calculate the gross area and net area compressive strength.