Hi, During hand mixing of concrete care must be taken for good quality of the mix.
Procedure: mixing by hand should be done at a clean and smooth place.
Spread evenly the measured quantity of sand.
Spread the required amount of cement over the sand.
Which speed mix the sand and cement uniformly with turning the mixture again and again till the even colour with the streak-free mixture will form.
then makes the measured quantity of coarse aggregate and spread over the mixture of sand and cement.
Again mix all the ingredients and forming a whole mass. Mix at least three times by turning again and again from centre to outside Mannar.
Make a hollow hole in the middle of mixed file
3:1 ratio should be considered and add the 3 quarter of the total quantity of amount of water and mixed the materials by turning from centre to side till the uniform colour will occur.
Then an extra cement of 5% should be added when hand mixing is adopted.
The PPE kits should be nearby the labour for self-protection.
After the use of concrete test wash the mixing platform at the end of the day.