1. Circle the most appropriate response (s) to each of the given

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