Bottorff Construction Inc.

Kansas City, Missouri

Smart™ Concrete shortens project schedule by 4 weeks, saving tens of thousands of dollars.

4

Weeks Saved

Profitability

Delays

PROBLEM

In Kansas City, Bottorff Construction provided all concrete work on a high profile, 276-unit, super energy-efficient multi-family apartment at Second and Delaware.

Bottorff Challenges Test Results

The team faced a number of challenges with their schedule during winter when temperatures dropped into the low 20°F (-6°C) range. Bottorff had 14 columns poured as part of their 200-level concrete work. Construction stopped when their inspection agency reported that traditional break-tests were low, suggesting the concrete had frozen or was in some way deficient. Bottorff challenged whether field-cured cylinders were following ACI guidelines for cold weather conditions and accurately reflecting strength of in-place concrete.

“The agency would cast their cylinders and set them outside, next to our forms and try to wrap them with our blankets to protect them,” says J.J. Hanses Field Superintendent for Bottorff. “We told them that they were going to break low doing their cylinders that way,” he adds.

Rip and Replace

Based on the lab results, Bottorff was confronted with the possibility of having to “rip and replace” all level-200 concrete work at a tremendous cost. Non-destructive testing with a rebound hammer confirmed that compressive strength had been achieved as the team had expected.

Photo Credit: Bottorff Construction Inc.

SOLUTION

Geiger Ready-Mix Recommends a Better Way

Wanting to avoid further delays and discrepancies with the inspection agency’s lab results, Bottorff turned to Geiger Ready-Mix, one of the foremost concrete suppliers in Kansas City.

“The conditions here made it extremely difficult, if not unrealistic, for field-cured cylinders to capture the accurate in-place strength results required,” says William Pettit, Project Manager for Bottorff. “With a tight schedule to maintain, the time-consuming process of cylinder break tests was not meeting our needs, nor the building owners’,” adds Pettit.

Geiger recommended Giatec Smart™ Concrete to enable Bottorff to capture real-time data on concrete temperature and strength. Smart™ Concrete enables contractors to attach small, unobtrusive wireless sensors to the rebars of concrete pours. Data is uploaded immediately to an easy-to-use app on any Android or iOS device where is can be accessed at any time. The sensors have a battery life of up to four months. All data is ASTM C1074 compliant and approved by ACI 318, CSAA23.1 and the majority of USDOT specifications.

“We feel providing solutions that make our customer’s jobs easier, while having a positive impact on their bottom line, is one of the best ways we can add value,” says Jim Jauernig, General Sales Manager, Geiger Ready-Mix. “This value solidifies our relationship with them – and in this case, Smart™ Concrete was a perfect fit.”

Geiger Ready-Mix

Photo Credit: Bottorff Construction Inc.

RESULTS

Bottorff used a total of 28 Smart™ Concrete sensors for the next phase of concrete work – with a hard target of achieving 8,000 psi in 28-days.

Prior to using maturity sensors, Bottorff was waiting three days to strip concrete formwork – which delayed the entire project because the welder and others couldn’t access the site. “Instead, with Smart™ Concrete, we had actual, reliable information in real-time which enabled us to make immediate decisions and strip forms the next day, based solely on the probe data,” confirms Pettit.

Agency Test Results Match Smart™ Concrete Data

Bottorff and their testing agency continued to use break tests for absolute verification of concrete strength. When these results were available, Smart™ Concrete sensors reported the same results within 200 psi.

“By using Smart™ Concrete, rather than relying solely on traditional break tests, there was no hold-up in our schedule – none whatsoever” said Hanses.

Using Smart™ Concrete took a month of the schedule, saving tens of thousands of dollars – Pettit

The fact that Smart™ Concrete provided a reliable counterpoint to lab test results was invaluable – enabling Bottorff to provide assurances to the building owner about achieving concrete strength. This allowed the team to move forward confidently with a more aggressive schedule on this very high-profile project.

Bottorff plans to continue to use Smart™ Concrete sensors in all future projects.

Bottorff Construction

Photo Credit: Bottorff Construction Inc.

“By using Smart™ Concrete rather than relying solely on traditional break tests, there was no hold-up in our schedule – none whatsoever.”

J.J. Hanses

Field Superintendent, Bottorff Construction

“Using Smart™ Concrete took a month off our schedule, saving us tens of thousands of dollars.”

William Pettit

Project Manager, Bottorff

“Smart™ Concrete was a perfect fit.”

Jim Jauernig

Manager, Geiger Ready-Mix

“We had actual, reliable real-time data from Smart™ Concrete, enabling us to make immediate decisions and stay on schedule.”

J.J. Hanses

Field Superintendent, Bottorff Construction