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2 X 2 inch grout cubes

2 X 2 inch grout cubes

2 X 2 inch grout cubes

(OP)
Why would the compressive strength of our grout cubes DECREASE from 7-day to 28-day?

RE: 2 X 2 inch grout cubes

Is it a repeated strength drop or just for a single sample? I would first check for sampling or curing issues, possibly testing issues. Cubes were properly cured (always fully immersed)? Similar drying procedure/ moisture content when the cubes were tested?

RE: 2 X 2 inch grout cubes

Sometimes they are damaged removing them from the molds. If the bond break (oil) is not applied properly, it can take real effort to get them free.

RE: 2 X 2 inch grout cubes

The mass of gang molds for 2x2 cubes is significantly greater than the mass of the cubes. Small disturbances of the molds result in large disturbances to the samples.

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