# Gopal Mishra - Comments

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## Reinforced Concrete Slab Design Guidelines

## Gopal Mishra

Sure, that will also be posted...

Sure, that will also be posted…

See less## Compaction of Soil – Test Methods of Soil Compaction and their Uses

## Gopal Mishra

The volume of backfill required depends on the void ratio and water content of the backfill and also the desired void ratio of the compacted soil, i.e. the degree of compaction. So, more data is required to say how much backfill you need for 100 cubic m.

The volume of backfill required depends on the void ratio and water content of the backfill and also the desired void ratio of the compacted soil, i.e. the degree of compaction. So, more data is required to say how much backfill you need for 100 cubic m.

See less## Quantities of Materials Per Cubic Meter of Concrete and Mortar Mix Proportions

## Gopal Mishra

for 15MPa, as per Indian code, its mix ratio is 1:2:4, and for this mix, it is shown in the above table that, cement required is 310kg of cement or 6.2 number of bags of cement, 0.434 cubic meter of sand (FA) and 0.868 cubic meter of coarse aggregate or stone. similarly, for M20 or 20MPa concrete, rRead more

for 15MPa, as per Indian code, its mix ratio is 1:2:4, and for this mix, it is shown in the above table that, cement required is 310kg of cement or 6.2 number of bags of cement, 0.434 cubic meter of sand (FA) and 0.868 cubic meter of coarse aggregate or stone.

See lesssimilarly, for M20 or 20MPa concrete, refer above table with mix ratio of 1:1.5:3, you will find, 395 kg of cement or 7.9 bags of cement, 0.414 cubic meter of sand (FA) and 0.828 cubic meter of stone (CA).

I hope this clears the doubt.

## DESIGN OF FOOTINGS – IS-456 RECOMMENDATIONS

## Gopal Mishra

As you are saying that the critical section for shear for one of the step is going out of the footing area, that means, the step below the step for which you want to calculate the shear has dimension less than depth of the step beyond it. First you have to make sure that the size of the footing hasRead more

As you are saying that the critical section for shear for one of the step is going out of the footing area, that means, the step below the step for which you want to calculate the shear has dimension less than depth of the step beyond it.

First you have to make sure that the size of the footing has required area so that the stress is below bearing capacity. If that is the case, then there is no point in checking the shear at a distance d from the step in concerned, because you are already providing more depth of the step than required. The critical section is going away from the footing. That means,it is already safe from shear point of view, but you have to verify that it must be safe in punching shear. Just check for punching shear and your design is ready.Do check for other required parameters.

All the best.

See less## Compressive Strength of Concrete -Cube Test [PDF], Procedure, Results

## Gopal Mishra

its compressive strength will be 67.5tonnes divided by area, i.e 67.5/(150x150) tonnes/sq.mm 67.5 tonnes = 67.5x10000 N. so convert it into N/sq.mm

its compressive strength will be 67.5tonnes divided by area, i.e 67.5/(150×150) tonnes/sq.mm

See less67.5 tonnes = 67.5×10000 N. so convert it into N/sq.mm

## Compressive Strength of Concrete -Cube Test [PDF], Procedure, Results

## Gopal Mishra

concrete gains about 50 % strength in 3 days of casting, 70% strength in 7 days of casting and 90% of its strength in 14 days of casting.

concrete gains about 50 % strength in 3 days of casting, 70% strength in 7 days of casting and 90% of its strength in 14 days of casting.

See less