Submitted Questions

  • Concrete Cube

    The size of concrete cube is 150mm x 150mm x 150mm as per Indian Standards. Why?

    SHAHNAWAZ

    • Sep 27th, 2012

    The practical result of checking strength of concrete at 7 days & 28 days depends on the cube size 150x150x150, if we change the dimension, the checking days will change.

    Arup

    • Jul 10th, 2012

    According to British Standard (BS) 1881:1983
    100 mm cubes can take up to 20mm CA and 150mm cubes can accommodate up to 40mm CA!

  • Grade of PPC cement

    Why is the grade of PPC cement is not mentiond or defined as per Indian Standard" IS 1489-1991.

    VP Annadurai

    • Aug 16th, 2019

    PPC cement made from OPC cement by adding fly ash 20% 30%, so it is equal to 33 grade.

    Sanchit garg

    • Aug 10th, 2015

    When we add fly ash to make PPC then its strength is not fixed.
    More you do curing more you get strength, moment you stop curing strength will stop that place. Where as in OPC highest strength is fixed to a mark. that is why OPC has grading but PPC dosen't have.