Construction Planning and Management
Crash project duration is obtained by summing the

Crash durations for all activities
Crash durations for all the activities along the critical path obtained by taking into account the crash duration for all the activities
Normal durations for all the activities
Crash durations for all the activities along the critical path obtained by taking into account the normal duration for all the activities

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Construction Planning and Management
At a work site, statistical quality control of concrete means

Reduction in costs for the removal of defects
Reduction in wastage of inspection costs
Measurement of risks to eliminate failures
Applying the theory' of probability to sample testing or inspection

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