Extracted text: Q2 /Fill up the blanks in the following: 6- the shape and surface texture of aggregate influence considerably the 7- before the concrete has stiffened, at 1 to 2 hours after placing 8- when small quantities of concrete have to be mixed by hand used 9- The average rate mixing time about one minute to 10- .....It is usual to vibrate concrete immediately after placing so that consolidation is generally compléted minutes. is a some of the water in the mix tends to rise to the surface of freshly placed concrete ar