Problem
1. A Burgers model is made by connecting a Maxwell and a Kelvin model in series. Suppose that a Burgers material is maintained under a constant stress until time t1 and then unloaded. Draw the graph of strain vs. time.
2. Assume that a mass concrete structure should not have a temperature difference greater than 13oC. Given the following conditions: adiabatic temperature rise, 42oC; ambient temperature, 23oC; temperature losses, 15oC. Determine the maximum temperature of fresh concrete to avoid cracking.
The response should include a reference list. Double-space, using Times New Roman 12 pnt font, one-inch margins, and APA style of writing and citations.