psi required to remove lightweight concrete from molds
psi required to remove lightweight concrete from molds
(OP)
We have a cellular, foam entrained mix for a pre-cast panel application that has about 45-55% air by volume. Ultimate strengths needed are 1200-1500 psi, and we can hit 550 psi within 24 hrs. At what strength can we effectively break out product from the molds? This can obviously be verified through experimentation, but we are not yet in production of this product.





RE: psi required to remove lightweight concrete from molds
RE: psi required to remove lightweight concrete from molds
Your problem sounds similar to AAC where the molds are designed to be removed FROM the concrete for further use (cutting, dimensioning, etc.).
Have you looked into the processes that have been used for decades on many construction materials? some are two stage system and others are a single curing operation and details that cannot be form are carved out in a separate process prior to packaging or delivery.
Usually, these products are produced in a very sophisticated plant with fine tuning of the mixes and processes to be able to adapt to different products after research and actual production using the same materials anticipated.
Dick
Engineer and international traveler interested in construction techniques, problems and proper design.
RE: psi required to remove lightweight concrete from molds
Yes, experimentation will be your better guide for this. It will depend on the geometry of the product, how vigorous the removal process has to be and how the product is supported during removal. Obviously, if the product can be fully supported during removal so that no bending stresses are introduced, it would be better. It would also be better to remove the mold from the product, not the product from the mold.
RE: psi required to remove lightweight concrete from molds
RE: psi required to remove lightweight concrete from molds