The desired characteristic strength of a mix is 20N/mm². The standard deviation is 4 N/mm² for 150 mm size of concrete cubes, and K = 1.645. The average strength of the cubes will be nearly.
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- You are assigned to monitor the concrete strength gain at a construction site. The ultimate compressive strength of the concrete at its full maturity is 450 kg/m. The average concrete temperature at the construction site is 25 °C during the day and 15 °C during the night (assuming 12-hour day/night cycles). If you assume that the datum temperature (To) is - 10 °C, estimate the strength of concrete after 14 days. (4=35, B=51)Maturity Index, M = E(T - To).F 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 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.
- In designing a concrete mix, if the amount of mixing water is estimated at W = 185 Kg/m, the SSD weight of the coarse aggregate is 1045 Kg/m, and the SSD weight of the fine aggregate is 617 Kg/m. The coarse aggregate has a moisture content of 1% and an absorption capacity of 2%. The fine aggregate has a moisture content of 2% and an absorption capacity of 5%. The adjusted weight of mixing water (in Kg/m³) is: O 177 O 214 156 193 O 172 O O O O OConcrete 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.Aggregates resistance to wear can be determined through Select one: O A. Aggregates soundness test. O B. Aggregates Impact value test. O C. Aggregates crushing strength test. O D. Los Angeles abrasion test
- F 1. The "slump" test is used to determine the compressive strength of a concrete. (F) 2. For room temperature and axial loadingaluminum behaves as a brittle material. T. T 3. Proper curing is important for a concrete specimen to gain compressive strength. T. (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. T F 6. Plasticity is characterized by return of a ħaterial to original size & shape upon removal of stress. т F 7. Strain hardening increases the elastic strength of the material. T F 8. Some materials do not exhibit a well defined yield point. T F 9. The failure behavior of our aluminum specimen in our torsion test was expected. T F 10. Necking of a steel specimen loaded in tension is an example of Poisson's ratio.An aluminum pipe is filled in polymer concrete is subjected to a pure compressive force as shown in the figure below. Determine the factor of safety against compressive stress acting on the column. The pipe has an outer diameter of 60 mm and inner diameter of 50 mm. The aluminum and the polymer concrete have the following material properties: Young's modulus: Eal = 70 GPa (aluminum). Ecr = 10 GPa (polymer concrete). Yield compressive strength: Sy-al = 150 MPa (aluminum), Sy-cr= 80 MPa (polymer concrete). 100 kN 500 mm Select one O FS = 6.4 FS= 1.3 o FS =1.1 O FS =1.7 OFS=50Example 2: Design a concrete mix to implement a concrete slab (exposed to sever conditions moisture and freezing and thawing) with design compressive strength 30 MPa, a standard deviation equals to 4 and the percentage expected less than minimum strength is 10%. Sulphate Resisting Portland Cement is used. The maximum size of an angular aggregate is 20 mm with apparent density 1500 kg/m3. The available fine aggregate has fineness modulus 2.4 An air entraining agent has been used in the mix.
- choose the correct answer With more coarse aggregate, does the quality of materials change from less to better quality? a-yes b-noEstimate the tensile strength required to prevent cracking in a concretelike material that is cast into a bar, 1.25 m long, and is fully restrained at each end against axial movement. The concrete is initially cast and cured at a temperature of 40°C and subsequently cools to a temperature of -20°C. Assume that the modulus of elasticity is 35 GPa and the thermal coefficient is 9 * 10-6 in./in./°C.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.