Home / Questions / A contractor fabricated 0 5 m thick concrete slab foundation to support a load testing mac...
A contractor fabricated 0.5 m thick concrete slab foundation to support a load testing machine. The owner had some concerns about the fabrication quality, primarily the concrete strength. What NDE method(s) do you recommend for this investigation?
2. A 0.25 m thick concrete panel is fabricated and tested using the impact echo test method. The measured peak frequency for the slab is 8.42 kHz. a) Calculate the P-wave velocity Vp for the solid slab. b) The impact echo test results in a defected location gives a peak frequency of 16.32 kHz. Calculate the depth of defect.
3. Contractor proposed to use an ultrasonic pulse velocity (UPV) equipment to measure the quality of a floor casted over soil. The contractor has access only to the top surface. What is the suitable method to measure the slab thickness?
4. An intern performed the resistivity test according to AASHTO T358 on two sets of 4 × 8 in. cylinder specimens at 28-day of concrete age. One set of specimens (ASTM) were wet cured through the testing ages. Other set of specimens (Field) were wet cured for seven day following specimen fabrication, then dry cured. The average resistivity results of two sets of specimens are 89.8 and 14.9 kO – cm. However, the intern forgot to document the curing conditions. What is the result of average resistivity for the ASTM and Field specimens? Justify your answer. What is the likely corrosion rate for both sets of specimens according to the recommendation of CEB-192?
5. List the parameters that can impact the wave velocity in concrete during ultrasonic pulse velocity (UPV) test.
</pdir="ltr"></pdir="ltr">
May 19 2020 View more View Less
In Nov. 2009, Company had a share price of $39.20. They had 91.33 million shares outstanding, a market-to-book ratio of 3.76. In addition, the company had $845.01 million...
Aug 12 2020Steve Van Doren, son of Vans founder, is the self-proclaimed "ambassador of fun" at Vans. Because the company doesn't want to discount its products or lower its prices, i...
Jul 24 2021Write a program that reads daily maximum and minimum temperatures for the most recent full month of January from a data file. Store the temperatures in a 2-dimensional ar...
May 27 2020Airlines can price discriminate by determining people's (1) to pay for luggage accommodations. Some customers will check a bag, others will not. Although not all customer...
Jun 10 2021Customer profitability, customer-cost hierarchy. Enviro-Tech has only two retail and two wholesale customers. Information relating to each customer for 2017 follows (in t...
Jul 19 2020Tsypkin Company's budgeted sales quantity was 80,000 units of product. The company's accountant, using regression analysis, applied the following cost formula to ...
Feb 06 2020The inverse market demand is P=175 – 6Q. There are 2 plants with cost functions TC1 = 15+6q1+q1² TC2 = 18+2q2+2q2² a. Determine the single plant monopoly profit-maximizin...
Jun 01 2020Suppose that x denotes the amount of rainfall on your hometown during a randomly selected month and Y denotes the number of children born in Los Angeles During the same m...
May 02 2020Refer to the table below. It shows the number of hours it requires for Mexico and Venezuela to produce 1 bicycle and 1 bushel of bananas.BicyclesBananas (bushels)Mexico10...
Apr 30 2020Secretion of ________ stimulates breakdown of bone and activation of vitamin D.a. glucagonb. melatoninc. thyroid hormoned. parathyroid hormone
Jul 06 2021