Design of Concrete Structures Set 2

In properly graded aggregates, bulk density is more ✘ In single size aggregates, bulk density is least ✘ In single size aggregates, bulk density is maximum ✘ None of these ✔

100 cm ✘ 125 cm ✘ 150 cm ✘ 200 cm ✔

600 mm ✘ 750 mm ✘ 900 mm ✘ More than 1 m ✔

Internal vibrator ✘ Screed vibrator ✘ Form vibrator ✘ None of these ✔

10 m ✘ 15 m ✘ 25 m ✘ 45 m ✔

About 0.1 N/mm ✘ Zero ✘ 0.3 N/mm ✘ About 1.0 N/mm ✔

According to the petrological characteristics, concrete aggregates are classified as heavy weight, normal weight and light weight ✘ According to the shape of the particles, concrete aggregates are classified as rounded irregular, angular and flaky ✘ According to the surface texture of the particles, the concrete aggregates are classified as glassy, smooth, granular, rough, crystalline, honey combed and porous ✘ All the above ✔

The concrete gains strength due to hydration of cement ✘ The concrete does not set at freezing point ✘ The strength of concrete increases with its age ✘ All the above ✔

At the middle of the wall ✘ At the edge of the wall ✘ Halfway between the middle and edge of the wall ✘ At a distance equal to effective depth of footing from the edge of the wall ✔

Bleeding ✘ Creeping ✘ Segregation ✘ Flooding ✔