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Most concrete strengths are designed stronger than working strength, this allows for just such an occasion. First, the engineer who designed the structure should do a recalculation to determine the actual strength needed for the structure. If the 28 day strengths still fall short it may be...

This is a fairly new technique. I will be employing this new techinque in my work in the near future. When I learn more I will update you.

Use the slump cone in the normal position and do not tamp. Simply fill and record the average diameter of the spread. I believe you should have specs on this but you should be reading somewhere around 26-30 inches.

shm I believe when testing this type of concrete they use a method whereupon you use a slump cone, only instead of measuring the slump you would measure the diameter of the spread. This would be for a self compacting type of mix.

I am a Q.C. Lab manager for a precast concrete company. Needless to say we have our own in-house batch plant. The percentage of moisture in the fine aggregate is critical to preparing a proper batch of concrete per mix design. We have a moisture meter installed in our F.A. bin near the jog...