In concrete construction, planning and communication are imperative to successful projects.No – ASTM C-94 also states that these limitations can be waved if the slump meets mix design specifications without adding water.Yes - According to ASTM C-94, concrete discharge must be complete within 90 minutes of mixing water with cement and aggregates.When is a concrete truck considered too old to pour? Do you have to send it back? In the past, concrete contractors have tried to sneak old trucks into the pour, but today we have third party testing companies that test the concrete batches. A common issue on job sites is the decision on whether to pour an old concrete truck or send it back.
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