U.S. 275/Iowa 29 Interchange
Owner: Iowa Department of Transportation
General Contractor: Phase 1: Hawkins Construction, Inc.
General Contractor: Phase 2: Ames Construction Company, Inc.
General Contractor: Phase 3: Cramer and Associates, Inc.
Duration of Work: 20 weeks
Subsurface Conditions: Soft clays underlain by loose to medium dense silty sand
Approximate Key Quantities: 26,159 Controlled Modulus Column (CMC)® rigid inclusions, 759,306 linear feet of wick drains
The I-29 & US 275 Interchange project is the first portion of a multi-phase, multi-year highway construction project. The Iowa DOT awarded the design to CH2M Hill and the overall work to Hawkins Construction. Menard USA was subcontracted to install Controlled Modulus Column (CMC)® and wick drains for ground improvement to support proposed embankment construction.
The site included seven contract areas. The project was impressive for Menard USA in that it had 8 load tests, the most CMCs installed in the US (over 15,000), and had 6 drill rigs operating at one time. Overall, it was a multifaceted, schedule driven project in a generally congested area.
Menard USA did not design the ground improvement solution. But overall, the system that was installed was a combination of CMC and wick drains.