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HIPERPAV Software - Frequently Asked Questions

Validation Model Summary | HIPERPAV Technical Memorandums | HIPERPAV FAQ's

The HIPERPAV Team has compiled a list of the most frequently asked questions about HIPERPAV and the corresponding answers. These questions and answers are grouped under the following subject headings:

Design Inputs | Mix Design Inputs | Environmental Inputs |
Construction Inputs | Analysis | Modeling | Software Interface |
Availability | General Questions

Questions on Design Inputs

1. How do I measure slab-base friction?

2. What is a push-off test?

3. What value of tensile strength do I use - the spec value?

4. What if I have only flexural or compressive strength?

5. What if I don't have information on concrete's modulus of elasticity?

6. How is reliability considered?

7. Why is reliability an input for the user?

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Questions on Mix Design Inputs

8. Does the program check mix proportions?

9. How are chemical admixtures accounted for since there are no inputs for dosage rates?

10. Can differences in cement chemistry from the default cement types be modeled?

11. Does the program consider cement grind (fineness)?

12. Why is cement type IV not included in the default cement types?

13. Does the software consider blended cements like cement type IS?

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14. Could concrete heat of hydration information from adiabatic calorimetry tests be used as input for the software?

15. Is air entrainment considered in HIPERPAV?

16. Is aggregate shape or size considered?

17. Does HIPERPAV consider blended aggregates?

18. Can the program consider shrinkage-compensating cements?

19. How do you take into account aggregate CTE during the design phase when there is yet no information on their source?

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Questions on Environmental Inputs

20. Can wind speed be varied over the 72 hour period?

21. Where should wind speed be measured?

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Questions on Construction Inputs

22. What would be the best time of placement based on ambient temperature conditions, noting that early placement during the day might be a dangerous time for hot weather concreting?

Questions on the Analysis

23. Why is the program limited to 72 hours of analysis?

24. How often does HIPERPAV calculate stresses?

25. Why doesn't the stress drop when a crack is predicted?

26. Can HIPERPAV determine what the pattern of cracking would be for any given concrete age at saw cut?

27. Is the strength input to the program affected by environmental conditions?

28. Why did the predicted strength not change when I increased my Cement Content?

29. HIPERPAV performs the analysis for unloaded conditions. What happens for loaded conditions?

30. Why don't the program results change significantly with different curing compound dosage rates (single, double and triple)?

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Questions on Modeling

31. How does HIPERPAV account for air temperature on concrete strength development?

32. What reference is taken for the temperature differential in the model's computation of stresses?

33. Is there a specification for initial and final set of concrete?

34. At what point in the concrete slab's profile is the tensile strength predicted by HIPERPAV?

35. Is bleed rate accounted for in HIPERPAV?

36. How is cement variability considered?

37. Before joint sawing, what slab length does HIPERPAV consider in the analysis?

38. What is the maximum thickness that can be modeled?

39. Can HIPERPAV be used for fast setting cements?

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Questions on Software Interface

40. Is it possible to input mixed U.S. and Metric units?

41. Is there online help?

Questions on Availability

42. When will HIPERPAV be available?

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General Questions

43. Why should I trust this software? It seems like a black-box.

44. Can HIPERPAV predict cracking of bridge-decks?

45. Does this software tell the state or contractor what to do?

46. Are we looking at working with a computer to make decisions in the field?

 


The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT).
The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT). Provide leadership and technology for the delivery of long life pavements that meet our customers needs and are safe, cost effective, and can be effectively maintained. Federal Highway Administration's (FHWA) R&T Web site portal, which provides access to or information about the Agency’s R&T program, projects, partnerships, publications, and results.
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