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The floors of the basements and upper floors were poured in 20.5 square feet (1.90 m 2) slabs. These slabs were 11 inches (28 cm) thick in the basements and on the first floor, and 9.5 inches (24 cm) thick on all other floors. [6] The roof was a 7.5-inch-thick (19 cm) slab. [33] Spandrel beams were not used in the flooring system. The exception ...
After the two halves were fastened together, a steel form was used to close the 1-foot-6-inch-wide (0.46 m) gap between halves, and concrete was poured in the gap. [26] The upper deck rests on 12-inch-wide (30 cm) shoulders built into the tunnel wall, padded by 1 ⁄ 2-inch-thick (1.3 cm) Masonite. [14]
The Mark 84 can form a crater 50 feet (15 m) wide and 36 ft (11 m) deep. It can penetrate up to 15 inches (38 cm) of metal or 11 ft (3.4 m) of concrete, depending on the height from which it is dropped, and causes lethal fragmentation to a radius of 400 feet (120 m). [9]
The elastic modulus of the hardened paste may be in the order of 10-30 GPa and aggregates about 45 to 85 GPa. The concrete composite is then in the range of 30 to 50 GPa. The American Concrete Institute allows the modulus of elasticity to be calculated using the following equation: [5]
The compressive strength of concrete blocks and masonry walls varies from approximately 3.4 to 34.5 MPa (500–5,000 psi) based on the type of concrete used to manufacture the unit, stacking orientation, the type of mortar used to build the wall, and whether it is a load-bearing partition or not, among other factors. [18] [19] [20] [21]
The square is an Imperial unit of area that is used in the construction industry in the United States and Canada, [1] and was historically used in Australia. One square is equal to 100 square feet . Examples where the unit is used are roofing shingles, metal roofing, vinyl siding, and fibercement siding products.
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A concrete slab bridge with a length of 29.9 feet (9.1 m) was built across the creek in 1930 and a concrete tee beam with a length of 34.1 feet (10.4 m) was built over the creek in 1957. A prestressed box beam or girders bridge with a length of 68.9 feet (21.0 m) was built over it in 1958. Another bridge of the same type, but with two spans and ...