would happen to concrete during early hours casting?

What happens if any concrete cube fails in 28 days compressive strength test?

Describe effect of height to diameter ratio on concrete stremgth

Contraction joints: O A All of the above O B) Allow the concrete to move both horizontally and vertically OC) Minimize random cracks O D) Should be cut to a depth of one-half the slab thickness The most common method for placing concrete for sidewalks is O A) Buckets and Cranes O B) Chutes OC) Conveyors O D) Pumping What is the effect on the properties of hardened concrete if plastic concrete freezes for an extended period after placing? OA) All properties will be enhanced in quality O B) No effect on concrete properties OC) All properties will be reduced in quality O D) Concrete strength decreases but freeze/thaw resistance increases Bull floating is done: OA Immediately after hand floating O B) Immediately after bleed water has evaporated OC Before screeding O D) Immediately after screeding