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  1. StoneMaker

    Apply vacuum and then pressure to a concrete mold

    I have considered making my own spherical molds to be easier to manage. I have wondered what would happen if I made them so that I could hook it to a vacuum pump and air compressor. My thought is if the mold was vibrated and had a vacuum applied at regular intervals while filling it, it would...
  2. StoneMaker

    Need to modify mix to make it more flowable

    "What strength are you trying to obtain? I see a 7000 psi plus mix there. I'd reduce the cement, add some flyash, and increase the W/C to .4. " The paper describing the mix had it listed at a touch over 10,000 psi, if 50% slag cement is used. I want something as strong as possible. I make atlas...
  3. StoneMaker

    Need to modify mix to make it more flowable

    I have this mix, 1 Cubic yard Portland Cement Type 1 846 pounds Concrete Sand 1100 pounds #57 Crushed Limestone 1700 pounds Water 267 pounds Air 3% HRWR (as needed)42 ounces Retarder (as needed)21 ounces W/C Ratio 0.32 PVA macrofibers 96 ounces PVA microfibers 48 ounces This is for...
  4. StoneMaker

    Polymer modified concrete in molds

    I was thinking of experimenting with polymer modified concrete for precast applications. I am a bit hesitant though do to the price of the polymers and one of the bigger benefits is the strong adhesion of PMCs. I am wondering how easy it is to get the PMC to release from the inside of a mold. My...
  5. StoneMaker

    Slag cement

    I have finally been able to find someone willing to sell me a ton of slag cement. Unfortunately I would be paying close to double the bulk rate and I also have to pay labor involved in shoveling out 1 ton from the truck. I wanted slag cement for precast concrete. The mix design I would use has...
  6. StoneMaker

    Questions on concret mixes

    The mold is a sphere that has been cut in half. I put the mold together to form a complete sphere, tape it up and cover it in shrink wrap and pour concrete into a hole drilled in the top. I don't create two half spheres that I try to join together. Is water bath curing the best way to cure? I...
  7. StoneMaker

    Questions on concret mixes

    Hopefully I am not violating the rules, I am not an engineer, however every forum other than this that discusses concrete was either inactive or filled with spam. I make and sell atlas stones which are the concrete balls seen in strongman contests and am trying to figure some stuff out so I can...
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