As a consultant we cast and test the concrete cylinders. recently cylinders from a high rise construction site have some low 28-day strength. from time to time I can see the supplier casting their cylinder too onsite. Even though the situation has not be improved. about 30% of the specimen still have low strength (up to 10% lower). We follow CSA standard strictly for this sensative project. One thing comes to my mind is the initial curing. We leave the specimen in a elavated and air conditioning trailer. Is the shaking of the trailer resulted by the people walk, shutting the door and other a negative impact factor to the initial curing? I suspect. Any comments to my thought? Thanks
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