A group of 45 tests on a given type of concrete hada mean strength of 4820 psi and a standard deviationof 550 psi. Does this concrete satisfy the strengthrequirementfor 4000-psi concrete?
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A group of 45 tests on a given type of concrete had
a mean strength of 4820 psi and a standard deviation
of 550 psi. Does this concrete satisfy the strength
requirement
for 4000-psi concrete?
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- a design engineer has specified a concrete strength of 4400 psi. the ready mixed concrete producer has a plant standard deviation of 260 psi. what is the required average strength for the concrete?Four standard concrete cylinders of 6-inchdiameter cross section were tested underuniformly increasing axial compressive loads 28days after casting concrete. The maximummeasured loads were 121,000 lbs, 116,700 lbs,128,800 lbs, and 119,100 lbs. What is the averagecompressive strength of this concrete in ksi?What is the recommendations of Bulk density of concrete lab test? What is the errors that might happen on this lab test and how to prevent it? Recommendations for at least 4 industrial applications with details provided.
- 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?Urgent 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 GPaUsing the ACI code equation, estimate what would be the modulus of elasticity of this concrete at the required compressive strength if a project specifies a concrete strength of 24.1 MPa.
- Subject concrete technology Q: a)What particular precautions would you take when concreting (i) In winter, and (ii) in hot weather? b)What are the effects of hot weather on fresh concrete?The design engineer specifies a concrete strength of 5575 psi. Determine the required averagecompressive strength fora new plant where s is unknownb. a plant where s 550 psi for 22 test resultsc. a plant with extensive history of producing concrete with s = 450 psid. a plant with extensive history of producing concrete with s = 650 psiHow are the results of this performing the flexure test on concrete related to the compressive strength test results?
- Q: a) why do we need workable concrete? b) What is pozzolanic material; what benefits can be achieved by using Pozzolana with cement in concrete? c) For what purpose we use Ultrasonic Pulse velocity test? Also classify the quality of concrete if Ultrasonic Pulse velocity is 3.0km/sec? SIR, PLS GIVE ME PROPER AND CORRECT ANSWER WITH FULL DETAILS. THANKS SUBJECT: CONCRETE TECHNOLOGYThree standard mortar cubes were made using nonpotable water available at the job site, and three others were made using potable water. The cubes were tested for compressive strength after seven days of curing and produced the following failure loads in kilograms:Based on these results only, would you accept that water for mixing concrete according to ASTM standards? Why?Briefly describe how super high strength concrete (f’c = 15,000 psi) can be made