Also, post tensioning is very time sensitive. Usually 3 to 5 days after the concrete is poured. Too early, cables tear up out of the concrete. Too late, the concrete is too brittle, and can crack. Testing labs take test cylinders out of the ready mix trucks. When they reach 3500 psi crush strength in a hyd. press, it's time to pull the cables. The cables would have been pulled, down in the parking lot,or wherever it was pre-fabbed. Whoever made the "field call" to pull the cables again,up in the air, is in serious trouble. Too hard, too brittle. (3500 plus or minus, been a few years)
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Today's Featured Article - Horsepower Defined - by Staff. Indicated Horsepower This represents the power developed in the enine cylinder as obtained from the pressure in the cylinders. This is pressure obtained from an indicator which shows cylinder pressures. Indicated horsepower does not represent the actual useful power delivered by the engine. Brake Horsepower This is the actual horse power delivered by the engine to the shaft. It is equal to the "indicated horsepower" less the friction of the engine. It is useful hor
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