Engineering, 22.10.2020 16:01 gavergan
Ten consecutive strength tests are available for a new concrete mixture with fc= 4000 psi: 4830, 4980, 3840, 4370, 4410, 4890, 4450, 3970, 4780, and 4040psi
a. Do the strength results represent concrete of satisfactory quality? Explain
b. If f'cr, has been selected based on 30 consecutive test results from an earlier project with a sample standard deviation Ss, of 570 psi, must the mixture proportions be adjusted? Explain.
Answers: 1
Other questions on the subject: Engineering
Engineering, 04.07.2019 18:10, anna22684
Water at 70°f and streams enter the mixing chamber at the same mass flow rate, determine the temperature and the quality of the exiting stream. 0 psia is heated in a chamber by mixing it with saturated water vapor at 20 psia. if both streams enters the mixing chamber at the same mass flow rate, determine the temperature and the quality of the existing system.
Answers: 2
Engineering, 04.07.2019 18:10, selenamr
Ifa component is made of two or more materials with different modulus of elasticity (e), it is called a composite member and we calculate the factor·n". mention the formula for calculating n". also, ifn> 1, explain what will happen to the 1. transformed. gi) ifn 1, what will happen to the material when transformed material when
Answers: 1
Engineering, 04.07.2019 18:10, mamasbug4285
An air compression refrigeration system is to have an air pressure of 100 psia in the brine tank and an allowable air temperature increase of 60°f for standard vapor compression cycle temperatures of 77 f entering the expansion cylinder and 14 f entering the compression cylinder, calculate the coefficient of performance a. 2.5 b 3.3 c. 4.0 d. 5.0
Answers: 3
You know the right answer?
Ten consecutive strength tests are available for a new concrete mixture with fc= 4000 psi: 4830, 498...
Questions in other subjects:
History, 03.06.2020 13:26
Mathematics, 03.06.2020 13:26
History, 03.06.2020 13:26
History, 03.06.2020 13:26
