Compressive strength is a clearly defined property that can be measured directly at a particular point in time using standardized test methods. On the other hand, the properties making concrete durable are many in number. Therefore, durability is more complex to define, measure, and specify.
This was supposed to be simple. The site is flat and the building is all slab-on-grade. The geotechnical report stated the design ground water table is more than 3 m (10 ft) below grade. Why is there a need to spend in excess of $100,000, and add more than three weeks to the construction schedule for below-grade waterproofing? The short answer is: elevators.
When Airbus decided to construct its first U.S. manufacturing plant in Mobile, Alabama, the rainiest city in America, waterproofing challenges were expected to arise as quickly as the abundant groundwater would.
For roofs, concrete assemblies, and mechanical systems, there is an established tradition of testing and inspection to verify both the material installation and construction meet the specified design criteria. Owners usually accept this without hesitation, and are ready to pay for the expenses.
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