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Through considerable pretesting, RMC-Cemex designed concretes that met the specified criteria but also had a low temperature gain, a high compressive strength , and a low coefficient of thermal expansion.
In general, spray foam now utilizes densities nearer to 3 pounds per cubic foot than the previous 2 pounds per cubic foot, and higher compressive strengths as well.
The compressive strength is directly related to the density (lower density equals lower strength) and ranges from as low as 250 psi up to more than 3000 psi.
Ductal-FO, with organic fibers, yields somewhat lower compressive strengths of 17,000 to 22,000 psi and flexural strengths of 2200 to 3600 psi.
The caissons, with concrete compressive strengths of 5000 to 6000 psi, were in good condition and are being reused.
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