Concrete Technology Sheet 10

The initial and final setting times for ordinary portland cement are approximately related as

If the contributions of tricalcium silicate, dicalcium silicate, tricalcium aluminate and tetra calcium alumino ferrite to the 28 days strength of hydrated ordinary Portland cement are respectively W, X, Y and Z, then

The bond strength between steel and concrete is due to

For a given aggregate content, increasing the water-cement ratio in concrete

With the increase in rate of loading during testing, compressive strength of concrete

Endurance limit of mild steel is approximately equal to

According to Indian Standards, the grading of fine aggregates is divided into

Ratio of compressive strength to tensile strength of concrete

In concrete, use of angular crushed aggregate in place of natural rounded gravel affects

Prestressing losses in post-tensioned and pretensioned beams are respectively

The process of hardening the concrete mixes by keeping its surface moist for a certain period is called -

The final operation of finishing the concrete surface is called -

The levelling operation that removes humps and hollows and give a true, uniform concrete surface is called -

which of the following statement is correct while compacting concrete with vibrators  -

When vibrators are used for compaction, the consistency of concrete depends upon the -

For compacting plain concrete or one-way reinforced concrete floors, the vibrator used is -

For compacting large sections of mass concrete in structures, the type of vibrator used is -

The factor which effect the quality of compaction, is -

The object of compaction is to -

When the concrete mix is too wet, it causes -