stament (s) from the given list of probable correct responses.
A. The water/cement (w/c), ratio is a ratio of
(i). Volumes
(ii), Weights
(iii). Water content and mass of cement
(iv). Three of the above
.(V). None of the above/nB. A normal weight concrete weighs 145 pcf and has a specified
ultimate strength of 3000 psi. It's modulus of elasticity,
E is:"
(1). 57000 (3000) / psi
(ii). 3.6 10 psi
(iii). 3:1 * 10 psi
(iv). Three of the above
(v). (a) and (c)
(vi). None of the above/nc. The "ultimate concrete strength" can be described as:
(i). The concrete strength beyond which it fails
(ii). f'ç
(iii). Allowable stress in working stress design
(W.S.D.) method
(iv). All of the above
(v). (i) or (ii)/nD. If the thermal coefficient of expansion and contraction for
concrete is given as 0.0000055 in/in per degree. Fahrenheit,
and a reinforced concrete bridge spans 60 feet. The
temperature change is from -5 degree Fahrenheit to. + 115
degree Fahrenheit. The overall dimensional change in the
bridge's length is:
(1). (0:0000055 in/in per deg. Fah.) (110 °F) (60 ft)
(11). (0.0000055 in/in per deg. Fah.) (130 °F) (60 ft)
(iii) (0.0000055 in/in per deg. Fah.) (120 °F) (60 ft)
(iv). (0.0000055 in/in per deg. Fah.) (120 °F)/(60ft)
(V.). None of the above
./nE. The primary detrimental effect of excess water to a concrete
mix design with all other ingredients unchanged. is/are:
(i). Reduction in concrete strength
(ii). Reduction in concrete hardness
(iii). Reduction in concrete durability
(iv).
Reduction in concrete resistance to chemical
attack
(v). Reduction in concrete's freeze-thaw resisting
ability
(vi). All of the above
Fig: 1
Fig: 2
Fig: 3
Fig: 4
Fig: 5