I am using ASTM C1579 standard mold to investigate plastic shrinkage crack in concrete. Unfortunately I cannot find any crack on the concrete surface while the contraction on the mold edges can easily be seen. So, I believe the mold is not restrained enough. I wonder if anyone else has the same experience.
I've been using these molds for a while in my studies. It's really difficult to respond your question without considering the parameters contributing in the study. However, since the focus of my studies are in the assessment of the impact of the environmental conditions and curing practice on the cracking behaviour of this type of shrinkage, based on my experience so far, I can admit that your doubt toward these molds is justifiable and reasonable and I personally have already thought about it.
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