1. Westminster, Colorado June 12, 2012 2012 API Cooperative Testing Preliminary Report on Compressive Strength

2. 2012 Protocol Test Protocol in 2012 matched previous years: –Cubes: 100F 8 hours 140F 8 hours 100F 24 hours –UCA: 100F 8 hours 100F 24 hours Time to 50 and 500 psi Changes to protocol in 2012 –As in 2010, eliminated 20 minute pre-conditioning requirement –Eliminated the requirement to calculate cube density –Continue to request pictures of load frames utilized Further analysis to be included in Final CS Report in New Orleans –CS results tied to load frame group: Manual vs Digital –Evaluation of UCA Transit Time –Service Companies and other vs. Cement Plants –Load frame verification using low strength Burst Disks at known failure values

3. 100F-8hr Cube 100F-24hr Cube 140F-8hr Cube 100F-8hr UCA 100F-24hr UCA AVG 456250018324892306 Std Dev 147602473153389 CV 32.224.125.931.216.9 With +/- 2 Standard Deviations Deleted AVG 437250018004722883 Std Dev 120564427120264 CV 27.421.623.724.411.3 2012 Preliminary Strength Data

4. AVERAGESTD DEVCV 201020122000201220102012 100F - 8 hr Cube 74445624214732.532.2 100F - 24 hr Cube 3221250066360220.724.1 140F -8 hr Cube 2540183259247324.225.9 8 hr UCA 77148922215328.931.2 24 hr UCA 3129230642228913.516.9 Compressive Strength Comparison 2010 vs. 2012 (preliminary data)

5. UCA Time to 50 & 500 psi (preliminary data) 50 psi (min) 500 psi (min) AVG 245495 Std Dev 2769 CV 11.014.1 With +/- 2 Std Deviation Deleted AVG 247495 Std Dev 2347 CV 9.39.5

6. 2012 UCA and Cube CS sorted by value (preliminary data)

7. 8 hr Cube8 hr UCAChange24 hr Cube24 hr UCAChange 2012 4564893325002306(194) 2010 7447712732213129(92) 2008 558564624082243(165) 2006 92310149123822174(208) 2004 7958485325942391(203) 2002 8088514334083244(164) 2000 6937445121791981(198) 2000 to 2012 UCA vs Cubes Average Compressive Strength (preliminary data)

8. CV Comparison 2000 to 2012 (preliminary data)

11. 2012 Preliminary Conclusions High variability continues with 8 hr cube test. Initial CVs for all test categories continues to creep up. Historical relationships between cubes and UCA holds true. Good response to request for load frame pictures will permit further analysis. Let’s see what full data set reveals after more in depth analysis.

12. Thank you! Comments and Questions?