Water/cement ratio of concrete is the ratio of Volume of water to the volume of cement Volume of water to the weight cement Weight of water to the weight of cement Weight of water to the volume of cement (a) (b) (c) (d)
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- Concrete is required for a column that will be Severe exposed to freezing and thawing. The cross section of the column is 300 × 300 mm. The smallest spacing between reinforcing steel is 30 mm. The Required Average Compressive Strength of concrete at 28 days is 35 MPa with a slump of 80 to 100 mm. The properties of materials are as follows: ❖ Cement used is type I Portland cement with a specific gravity of 3.15. ◆ The available coarse aggregate has a maximum size of 23 mm, a dry-rodded unit weight of 1800 kg/m3, a bulk specific gravity (SSD) of 2.7, absorption capacity of 0.55%, and moisture content (SSD) of 0.25%. The fine aggregate has a bulk specific gravity (SSD) of 2.75, absorption capacity of 1.4%, a moisture content (SSD) of 2.5%, and a fineness modulus of 2.70. The aggregates conform to the ASTM C33-84 requirements for grading.Concrete is required for a column that will be moderately exposed to freezing and thawing. The cross section of the column is 300 × 300 mm. The smallest spacing between reinforcing steel is 30 mm. The specified compressive strength of concrete at 28 days is 40 MPa with a slump of 80 to 100 mm. The properties of materials are as follows: ❖ Cement used is type I Portland cement with a specific gravity of 3.15. ◆ The available coarse aggregate has a maximum size of 23 mm, a dry-rodded unit weight of 1800 kg/m3, a bulk specific gravity (SSD) of 2.7, absorption capacity of 0.55%, and moisture content (SSD) of 0.25%. The fine aggregate has a bulk specific gravity (SSD) of 2.75, absorption capacity of 1.4%, a moisture content (SSD) of 2.5%, and a fineness modulus of 2.70. The aggregates conform to the ASTM C33-84 requirements for grading.A. What are the primary and secondary parameters upon which durability of concrete depends on? Discuss in detail one PRIMARY PARAMETER to which concrete is exposed in the image shown: *
- What is the weakest property of concrete? The compressive strength of the coarse aggregate The compressive strength of the cement paste The bond between the cement paste and the aggregate The shear strength of the coarse aggregateConcrete is strongest when subjected to: O A) Tension O B) Bending O9 Torsion O D) Compression If a peak load of 250 kN was exerted on a 100 mm x 200 mm test cylinder, the compressive strength of the concrete is: OA) 28.6 MPa O B) 35.2 MPa O9 31.8 MPa O D) 32.4 MPa The approximate volume percentages of the principal components of a concrete mixture are: 6%, 11%, 41%, 26%, 16%. Which of the following lists matches the correct order of these main components? Start with the one at 6% and end with the one at 16%. O Air, Water, Coarse Aggregate, Fine Aggregate, Cement O Water, Coarse Aggregate, Fine Aggregate, Cement, Air O Air, Coarse Aggregate, Fine Aggregate, Water, Cement O Air, Cement, Coarse Aggregate, Fine Aggregate, Water Under ideal conditions, concrete should be batched and placed within after mixing, when retarding admixtures are not used. OA 90 minutes O B) 1/2 hour OC 4 hours O D) 120 minutesF 1. The "slump" test is used to determine the compressive strength of a concrete. T 2. For room temperature and axial loading,aluminum behaves as a brittle material. T. F 3. Proper curing is important for a concrete specimen to gain compressive strength. (F) 4. Concrete usually has a good tensile strength. T F 5. The units of the modulus of elasticity are the same as for axial stress. F 6. Plasticity is characterized by return of a material to original size & shape upon removal of stress. T. F 7. Strain hardening increases the elastic strength of the material. F 8. Some materials do not exhibit a well defined yield point. F 9. The failure behavior of our aluminum specimen in our torsion test was expected. T. T F 10. Necking of a steel specimen loaded in tension is an example of Poisson's ratio.
- Concrete is required for walls of a building that will be Mild Exposed to freezing and thawing. The cross section of a wall is 300 x 1500 mm. The smallest spacing between reinforcing steel is 50 mm. The specified compressive strength of Compressive strength of concrete at 28 days is 35 MPa and a slump of 55 mm. Portland cement type I is used with specific gravity of 3.12, maximum size of aggregate 27 mm and fineness modulus of fine aggregate is 2.4, absorption capacity and moisture content of fine aggregate are of 0.92%, and 1.95% respectively. The dry-rodded unit weight of coarse aggregate is 1820 kg/m³, absorption capacity and moisture content of coarse aggregate are of 0.75%, and 1.85% respectively. Both aggregates have a bulk specific gravity (SSD) of (2.45). The aggregates conform to the ASTM C33-84 requirements for grading. Estimate the quantity of (cement, fine aggregate, coarse aggregate and water) for 1m³ concrete.A concrete mix includes the following ingredients per cubic meter: a. Cement = 400 kg b. Water = 176 kg c. No admixture Table P6.30 shows possible changes that can be made to the mix ingredi- ents. Indicate in the appropriate boxes in the table what will happen in each case for the workability and the ultimate compressive strength as increase, decrease, or approximately the same.Briefly discuss each properties of concrete. a. Compressive strength b. Flexural strength c. Tensile strength d. Shear strength e. Modulus of elasticity f. Poisson’s ratio g. Shrinkage h. Creep
- What is the range of fineness of cement according to ASTM standardConcrete is required for a column that will be Severe Exposure to freezing and thawing. The cross section of the column is 300 × 300 mm. The smallest spacing between reinforcing steel is 40 mm. The specified compressive strength of concrete at 28 days is 40 MPa with a slump of 25 to 50 mm. The properties of materials are as follows: (a) Cement used is type I Portland cement with a specific gravity of 3.10. (b) The available coarse aggregate has a maximum size of 23 mm, a dry-rodded unit weight of 1800 kg/m3, a bulk specific gravity (SSD) of 2.68, absorption capacity of 0.65%, and moisture content (SSD) of 0.27%. (c) The fine aggregate has a bulk specific gravity (SSD) of 2.75, absorption capacity of 1.5%, a moisture content (SSD) of 2.5%, and a fineness modulus of 2.7,The aggregates conform to the ASTM C33-84 requirements for grading.This refers to a change from liquid state to solid state of cement paste.