chap 4

Question 1

what is overspray?

Answer 1

overspray

Question 2

x is mainly large aggregate with some sand and cement that counces or ricochets off the receiving surface and falls onto lower surfaces

Answer 2

rebound

Question 3

ACI defines shotcrete as a mortar or concrete pneumatically projected at x onto a surface

Answer 3

high velocity

Question 4

when does mixing occur in dry mix concrete

Answer 4

in the nozzle and as the material impacts the surface

Question 5

define dry mix shotcrete

Answer 5

dry-mix shotcrete is the process in which most of the mixing water is added at the nozzle just prior to placement

Question 6

in the wet mix shotcrete process, x is aded at the nozzle to increase the x

Answer 6

compressed air, material velocity

Question 7

shotcrete typically has a low x ratio and a high x content

Answer 7

water-cementitious material, cementitious material

Question 8

x is a method of placing x

Answer 8

shotcrete, concrete