PLACING OF CONCRETE AND ITS MIXING

There are some skills that are need to be gained by site engineer, contractor and mistry as well as the site supervisor. They must be aware and conquer about the cure of concrete. There are some certain issues which are to be faced during placing of concrete.

(a) First of all the reinforcement should be checked whether the nominal cover or clear cover is given or not. Otherwise this will lead to the rusting of reinforcement which will caused due to its atmospheric effect when water or muddy soil will enter into the pores or voids of the concrete.

(b) The next typical thing is that the shuttering should be checked whether it is straight or not or according to the drawing is given or not, max. end to end distance is provided or not. Because after pouring the concrete it will not be possible to adjust or remake it. Therefore all things should be checked before placing of concrete.

(c) The most important thing is that, the vibrator must be their at the site. Without vibrator the placing of concrete is of no use. It will lead to honeycomb like structures and failure of concrete. Therefore after placing of concrete upto the brim level the vibrator must be used.

HOW TO MIX THE CONCRETE

One of the most important thing is that the workers dosen't know how to mix the concrete. They think that they are the most experts in mixing the concrete but can't identify the ratio in what order to mix. For PCC the ratio is 1:3:6 and for RCC the ratio is 1:1.5:3 and above this is also given but the given ratio is for building works or dam works.

But before doing any concreting work first of all cube test should be done. It should be in the ratio 1:1.5:3. It is placed in the cube mould and after that it is taken in the lab for testing.

Moreover the further placing of concrete is to be done in a systematic manner or lucent manner. Otherwise there will be faulty in any case of concreting work. Be careful with mistry, contractor and supervisor. They think themselves to be the best because of experience in all this type of works. But the main technical term of this work is dosen't known by them. Neither they know the use of vibrator nor the mixing of aggregates as per w/c ratio.

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