CONCRETE TECHNOLOGY QUIZ on May 09, 2015 Get link Facebook Twitter Pinterest Email Other Apps SCROLL DOWN FOR QUIZ CONCRETE TECHNOLOGY Under normal conditions using an ordinary cement, the period of removal of the form work, is : 14 days for bottom slabs of spans 4.6 m and more 2 days for vertical sides of columns 21 days for bottom beams over 6 m spans all the above. After casting, an ordinary cement concrete on drying expands mix shrinks none of these. Curing. preserves the properties of concrete prevents the loss of water by evaporation reduces the shrinkage of concrete all The following proportion of the ingredients of concrete mix, is not in conformation to arbitrary m 1 : 2 : 8 1 : 3 : 6 1 : 2 : 4 1 : 4 : 10 Hydration of cement is due to chemical action of water with Dicalcium silicate and tricalcium aluminate Tricalcium silicate and dicalcium silicate Tricalcium aluminate and tricalcium alumino ferrite ALL OF ABOVE M10 grade of concrete approximates 1 : 2 : 4 mix 1 : 1 : 2 mix 1 : 3 : 6 mix 1 : 1.5 : 3 mix The bulk density of aggregates does not depend upon : size and shape of aggregates grading of aggregates specific gravity of aggregates size and shape of the container While compacting the concrete by a mechanical vibrator, the slump should not exceed 7.5 cm 5.0 cm 2.5 cm 10 cm The risk of segregation is more for larger proportion of maximum size aggregate coarser grading wetter mix all of above An aggregate is said to be flaky if its least dimension is less than 2/5th of mean dimension 3/5th of mean dimension 1/5th of mean dimension 4/5th of mean dimension ANSWERS 1.D 2.C 3.D 4.D 5.D 6.C 7.D 8.B 9.D 10.B