QI. Using the American Method, design a concrete mix for a slab with the following dimension (length - Sm, width - 4m, depth - 0.2m). The smallest spacing between reinforcing steel is 150 mm. The average compressive strength required for the concrete at 28 days is 25 MPa and slump to be in the range of 30-50 mm. The slab must be protected against corrosion since its extremely exposed to de-icing salts, brackish water, sea water or a spray from these. The raw materials used for this concrete have the following properties: Cement used is Ordinary Portland cement with a specific gravity of 3.15. The available coarse aggregate has a maximum size of 70 mm, a dry-rodded unit weight of 1740 kg'm3, a bulk specific gravity (SSD) of 2.55, absorption capacity of 0.55%. The fine aggregate has a bulk specific gravity (SSD) of 2.6 and a fineness modulus of 2.6. The aggregates conform to the ASTM C33-84 requirements for grading • Combined specific gravity of both fine and coarse aggregate - 2.55.
QI. Using the American Method, design a concrete mix for a slab with the following dimension (length - Sm, width - 4m, depth - 0.2m). The smallest spacing between reinforcing steel is 150 mm. The average compressive strength required for the concrete at 28 days is 25 MPa and slump to be in the range of 30-50 mm. The slab must be protected against corrosion since its extremely exposed to de-icing salts, brackish water, sea water or a spray from these. The raw materials used for this concrete have the following properties: Cement used is Ordinary Portland cement with a specific gravity of 3.15. The available coarse aggregate has a maximum size of 70 mm, a dry-rodded unit weight of 1740 kg'm3, a bulk specific gravity (SSD) of 2.55, absorption capacity of 0.55%. The fine aggregate has a bulk specific gravity (SSD) of 2.6 and a fineness modulus of 2.6. The aggregates conform to the ASTM C33-84 requirements for grading • Combined specific gravity of both fine and coarse aggregate - 2.55.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:QI. Using the American Method, design a concrete mix for a slab with the following dimension
(length - 8m, width - 4m, depth 0.2m). The smallest spacing between reinforcing steel is 150 mm.
The average compressive strength required for the concrete at 28 days is 25 MPa and slump to be in
the range of 30-50 mm. The stab must be protected against corrosion since its extremely exposed to
de-icing salts, brackish water, sea water or a spray from these. The raw materials used for this
concrete have the following properties:
• Cement used is Ordinary Portland cement with a specific gravity of 3.15.
The available coarse aggregate has a maximum size of 70 mm, a dry-rodded unit weight of 1740
kg/m3, a bulk specific gravity (SSD) of 2.55, absorption capacity of 0.55%.
The fine aggregate has a bulk specific gravity (SSD) of 2.6 and a fineness modulus of 2.6, The
aggregates conform to the ASTM C33-84 requirements for grading
• Combined specific gravity of both fine and coarse aggregate 2.55.
Note: for calculating the sand:
• Use the weight method.
Use the concrete density formula to obtain the precise density of concrete;
• Do not use the approximate density obtained from table 3-12; and
• Do not use the direct formula for calculating the sand weight.
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