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3 cards from this section. Quick, good the night before a test.
What is the formula for calculating target mean strength?
Think about the adjustment for material variability.
Explain the significance of the water-cement ratio.
Remember, more water may increase workability but can decrease strength.
What does the water-cement ratio primarily influence?
Think about how water impacts concrete properties.
True or False: The higher the water-cement ratio, the stronger the concrete.
Consider the effects of excessive water.
A contractor is tasked with a concrete mix for a highway requiring a strength of M35. Given a standard deviation of 3.5 MPa, calculate the target mean strength. If the recommended water-cement ratio is 0.40, estimate the water content required for 450 kg of cement.
Apply the target mean strength formula to find the desired strength.
In a trial mix for M25 concrete, you observed a slump of only 60 mm. The desired slump is 100 mm. Propose adjustments to increase workability while maintaining strength.
Adjustments should focus on improving the slump without exceeding target w/c ratios.
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