In what context is the slump test performed? (a) Strength of concrete (b) Workability of concrete (c) Water-cement ratio d) Durability of concrete
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- Determine the modulus of elasticity of concrete by the ACI formula for a concrete cylinder that has a unit weight of 120 pcf (1920 kg/m3) and a compressive strength of 3000 psi (21 MPa)What is the compressive strength of Concrete if a 6" cylindrical sample was tested in UTM and failed at 640 kN load? о 35 MPа о 28.5 MPа o 28 MPa o 30 MPaUrgent Take the unit weight of concrete to be 2400 kg/m3 and the specified compressive strength to be 28 MPa.From this, estimate the modulus of elasticity of concrete in GPa. (answer with complete solution) Final answer must be Ec = 26.752 GPa
- Three 100*200 mm cylindrical concrete specimens were tested for 28 days compressive strength and show 30.5 MPa, 29.6 MPa and 32.8 MPa compressive strength. a) What is the average compressive strength of this concrete? b) What is the approximate tensile strength of this concrete? c) What is the approximate modulus of elasticity of this concrete? For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). BIU Paragraph Arial 10pt A v x² X, +, 田用国 田用因 Ť } !!7. The third-point loading flexure strength test was performed on a concrete beam having a cross section of 150 mm by 150 mm and a span of 450 mm. If the load at failure was 35.7 kN, calculate the flexural strength of this concrete.Three 100*200 mm cylindrical concrete specimens were tested for 28 days compressive strength and show 25.5 MPa, 28.6 MPa and 24.8 MPa compressive strength. a) What is the average compressive strength of this concrete? b) What is the approximate tensile strength of this concrete? c) What is the approximate modulus of elasticity of this concrete?
- Compressive strength of normal-weight concrete is on average 31 MPa.What is the elasticity modulus expected to be?6) What are the three methods for measurement of tensile strength of concrete? Indicate which methods give the highest and the lowest tensile strengths for a given type of concrete with the same f'c.In a ready mixed concrete plant, 28 days compressive strength results of 16-cylinder specimens were determined as follows. According to ASTM C94 Ready mixed concrete standard and the given data, what should the minimum average compressive strength to be achieved for a concrete class of C30? Specimen # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Compressive Strength (MPa) 36 36 35 32 33 30 30 34 33 30 36 36 29 36 34 34 O a. 33.38 MPa O b. 37.22 MPa Oc 30 MPa O d. 33.84 MPa Oe. 37 MPa
- A concrete cylinder of diameter 150mm and length 300mm when subjected to an axial compressive load of 240KN resulted in an increase of diameter by 0.127mm and a decrease in length of 0.28mm.compute the values 1.poison ratio 2.modulus elasticityA normal-weight concrete has an average compressive strength of 4500 psi. What is the estimated modulus of elasticity? What is the estimated tensile strength of this concrete?What is the target mean strength (N/mm²) of the M30 grade concrete, if the standard deviation is 5.0?