what is high density concrete?

i will need the composition,usage,characteristic,advantages and disadvantages...

2 Answers

  • 1 decade ago
    Favorite Answer

    Heavyweight steel or iron shot is added as aggregate to cement during manufacture to make high density concrete.Steel or iron pellets used for making high density concrete for shielding against nuclear radiation.

  • Anonymous
    1 decade ago


    NELCO’s high density concrete block is designed for new construction or shielding upgrades for linear accelerators, H.D.R. rooms, and all therapeutic modalities requiring shielding materials. The block is manufactured in a standard size with three densities available to accommodate different physics requirements. For gamma radiation, higher density blocks (incorporating a larger concentration of steel aggregate) are more commonly utilized. For maximization of neutron shielding, lower density units are a viable solution.

    H.D. block is manufactured in an “N” interlocking design. It can be utilized for maze walls, vault walls or vault ceilings, with or without mortar (for modularity), depending on physics requirements and construction design. Ceilings are generally supported by an independent steel support structure.

    All NELCO H.D. concrete block is manufactured under strict NELCO quality guidelines.

    Product High density concrete block

    Design Interlocking modular units “N-Loc”

    Usage Low and high energy linear accelerator vaults, proton therapy, I.M.R.T., H.D.R., Gamma Knife, CyberKnife, cobalt shielding

    Dimensions 6"H x 6"W x 12"D

    Construction 145 lbs./cu. ft.; 240 lbs./cu. ft.; 288 lbs./cu.ft.

    Weight ranges from 36, 60, 72 lbs.

    Design Criteria Optimal shielding design achieved with utilization of lowest-cost shielding material, or combination of materials maximizing available space allocation

    Versatility For use in new or upgraded vault construction

    Interlocking “N” design assures shielding integrity

    Space Savings Higher density block saves space over traditional concrete construction

    Modularity Dry joint design easily uninstalled for relocation

    Fiscal Modular designs may be eligible for accelerated depreciation and after-tax savings

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