ConformaTech conducted construction material testing Quality Control (QC) services on the I-10 and Houghton Road Traffic Interchange in Tucson, Arizona.  The final project consisted of construction of a diverging diamond interchange which included replacing the existing bridge and enhancement of on and off ramps.  For this project, ConformaTech was contracted by Ames Construction, which was the prime contractor for the Arizona Department of Transportation (ADOT).  Total contract costs for our services on the project were $179,000.  This 1½-yearlong project began with the demolition of the existing bridge and subsequent construction of  a new six lane bridge.  The on- and off- ramps were then realigned and expanded to facilitate the new bridge.   The project included the importation, placement and compaction of approximately 24,000 cubic yards of aggregate base course.  Over 10,000 cubic yards of concrete were placed during the project.  Concrete placements included drilled shafts and Portland Cement Concrete Pavement (PCCP) for bridge decking and ramp approaches.  Over 20,000 tons of asphaltic concrete end product were placed on the four on and off-ramps leading to the new interchange as well as widening of shoulders.

ConformaTech provided QC testing for soils, mechanically stabilized earth, aggregates, concrete and asphaltic concrete production.  ConformaTech provided multiple engineering technicians who utilized their ATTI Field and ACI Field Testing Technician certifications during various stages of this project.  Field compaction testing included nuclear density/moisture and sand cone methods.  Concrete field sampling including air content, slump and temperature testing.  In addition, concrete laboratory testing included aggregate gradation, sand equivalent and compressive strength testing.  A total of 1,140 concrete cylinders were prepared in the field.  Approximately 750 nuclear density and sand cone tests were performed during construction.  Asphalt QC included field rolling patterns to establish proper in-place voids for ADOT acceptance.   Asphalt laboratory testing included oil content, mix voids and aggregate gradation.  Additional asphalt field QC testing at the hot plant was conducted by asphalt nuclear oil content determination and analysis of aggregate gradation for the final asphaltic concrete friction/wearing course.