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HW2_hiperpav_2009
Course: CEE 404, Fall 2008School: Washington
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404 CEE Winter Quarter 2009 Instructor: Steve Muench Homework 2: Early-Age PCC Pavement Properties Assignment For the repaving job discussed in "I-90 Construction Data", determine a paving "window" (the hours of the day that you desire to pave) in order to minimize the likelihood of early age cracking (slab stress > slab strength). This will require multiple HIPERPAV...
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404 CEE Winter Quarter 2009
Instructor: Steve Muench
Homework 2: Early-Age PCC Pavement Properties
Assignment
For the repaving job discussed in "I-90 Construction Data", determine a paving "window" (the hours of the day that you desire to pave) in order to minimize the likelihood of early age cracking (slab stress > slab strength). This will require multiple HIPERPAV runs.
Deliverables
1. One-page report (typed) with the following information: a. Acceptable paving window. For instance, 8 a.m. to 4 p.m. b. Short discussion of what physical phenomena are causing hours outside the paving window to be excluded. For hours where the critical stresses are greater than the slab strength; what physical phenomena is causing this? Chapter 2 of the user's manual can help. c. Bulleted list of at least 3 steps you could take to increase your paving window to 24 hours. Section 5.4 and other sections of the user's manual can help. You will need to start changing things in HIPERPAV and then doing analysis runs to see what the effects are on the paving window. These should be legitimate things a contractor can do rather than outlandish design or scope changes. For instance, changing the aggregate source to a different type of rock is not likely. d. The predominant type of built-in curling associated with paving at 3 pm. Section 2.4.2 of the user's manual can help. e. Given the one-way transport time you calculated in HW1, whether or not allows WSDOT you to use end-dump trucks to transport the PCC and why. 2. HIPERPAV printout of your results for the 12 p.m. paving hour showing: a. Input parameters b. Analysis results and graph (do not show dowel bar analysis or evaporation rate analysis) for a 12pm construction time. Although you will have to run more than one analysis to get a paving window please do NOT include all 24 hours. A bit about how HIPERPAV works: It calculates the early age behavior based on a bunch of inputs. On the Environmental screen you have to input the time of day of construction (e.g., 12pm). This time of day is critical. What HIPERPAV will do is assume you construct a slab at this time (e.g., 12pm) and the analysis will tell you what happens to that slab over the next 72 hours. In order to figure out a paving window you need to change this time of day by 1-hr increments (e.g., 12...
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