Modulus 7.0 - Backcalculation Software

Modulus 7.0 - Backcalculation Software

Modulus 7.0 is one of a backcalculation software. This software developed by Texas Transportation Institute. You can download the program at : https://pavementdesign.tamu.edu/downloading.htm

For downloading the program, password needed. You just have to ask the operator by email the request to the address that available at the website. The user manual available at this website too, and it dont need the password.

The minimum system requirements to run the program are (this is from the manual) :

• Operation systems: Windows 95/98/ME/NT 4.0/2000/XP
• CPU: Pentium-133 MHz or higher
• 16 MB RAM or higher
• 15 MB free hard drive space
• SVGA - True Color video mode
• For best running propose, the 1024×768 pixels screen resolution is recommended
• CD-ROM drive (if installation is done from a CD-ROM)
• Mouse or other suitable pointing device
• A printer supported by the computer running the program

But here is the issues, I've tried install on Windows 10 and Windows 8, and the installation is success, but when you try to analyze the data, it only do well until you input the FWD data, when you try to input the pavement thickness the error always occur.

You can try to use the original pavement thickness from the program, but the issues occur again when you try to running the backcalculaion, or remaining life. I’ve tried asking this problem to the operator, but they only suggest to uninstalling and reinstalling the program, decline any popups during the installation that offer to update a “.dll” file by clicking no and reboot the computer after the installation finish, but it didn’t fixed the issues at all.

Based on experience, the program is running well only on Windows 7 Home Premium 64-bit (6.1, Built 7601). Yes, it running well on this OS.. why?? I still don’t know, haha..

So.. the program is installing well, and you can operate the program by following the user manual, but how can we sure that the seed moduli or the poisson’s ratio we  input are represent our pavement conditions? How did the program do the backcalculated or the segmentation? Is the modulus resilient impact the remaining life result? You can find the answer in this papers :  

FHWA/TX-05/0-1869-2

FHWA/TX - 88/1123 - 1

Data needed for the analyze :

• Falling Weight Data (FWD) file
• Pavement structure and thickness
• Seed moduli per layers
• Poisson’s ratio per layers
• Pavement conditions (such as % crack and rutting)
• Cummulative Equivalent Single Axle Load (CESAL)

What we can analyze with Modulus 7.0 :

• Modulus Resilient per layers
• Segmentation
• Remaining Life

Sometimes we have another issues, the program cannot read our raw FWD file. How we fixed it? You can try to edit the example raw FWD file that available when you download the installation file and adjust it with our data. But remember, we have to know which number represent what.. don’t just replace the data, make sure you know how to read the raw FWD file.

For more information about raw file FWD test, you can googling the "DYNATEST FWD/HWD TEST SYSTEMS". 

Good luck..