Concrete Technology And Design Of Concrete Structures Set 4

0.15% to 2%

✘

0.8% to 4%

✘

0.8% to 6%

✘

0.8% to 8%

✔

workability ✘ strength ✘ the effects of temperature variations ✘ the unit weight ✔

segregation ✘ compaction ✘ shrinkage ✘ bulking ✔

Long line method ✘ Freyssinet system ✘ Magnel-Blaton system ✘ Lee-Macall system ✔

reduces workability ✘ increases bleeding ✘ increases shrinkage ✘ increases strength ✔

elastic shortening of concrete ✘ shrinkage of concrete ✘ creep of concrete ✘ loss due to friction ✔

Capacity of column is decreased ✘ Ductility of column reduces ✘ Capacity of column is decreased but ductility of column increases ✘ Both the capacity of column and ductility of column increase ✔

Not needed ✘ Provided equally on inner and front faces ✘ Provided more on inner face than on front face ✘ Provided more on front face than on inner face ✔

affects only the early development of strength ✘ affects only the ultimate strength ✘ both (a) and (b) ✘ does not affect the strength ✔

1.5 ✘ 2 ✘ 2.5 ✘ 3 ✔