A new book published by the American Society of Concrete Contractors (ASCC) chronicles the current state of tolerances related to concrete construction.
A large part of Colin Milberg's project that began in 2007 is simply collecting design and as-built data on concrete construction projects—and then figuring out exactly what and how to measure.
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The ACI Tolerances committee spent a grueling three and a half hours in St. Louis on Nov. 4 working through 45 comments from the Technical Activities Committee (TAC) on revisions to ACI 117, Specification for Tolerances for Concrete Construction and Materials. The TAC review is one of the last...
When you take an idea from the lab to the field, there always are hurdles to overcome. Even with the best of planning, the time comes for a reality check, and this fall Colin Milberg is again dealing with such an issue.
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If you've been following our monthly updates, you know ACI's Tolerances committee has three projects under way and all recently have been in the “ongoing hard work” phase. The process of updating the A117 “Standard Specifications for Tolerances for Concrete Construction and Materials and...
You wouldn't know it just by driving by any of the jobsites, but these days Southern Florida is a hotbed of laser scanning for high-rise construction.
Every ASTM standard test is supposed to include statements on its precision and bias, which are a lot like the fine print on a legal document. These two sections describe how accurately one can expect the test results to reflect the true condition of what's being tested, and in that way, also are a...
For more than a year now, we've been reporting on the development of the “Standard Measuring Protocol for Evaluation of Concrete Elements for Conformance to Specified Tolerances.” Colin Milberg of San Diego State University has been developing the plan an
It may have been just a happy coincidence, but my guess is that somebody set it up on purpose. Either way, having the regularly scheduled meeting of the ACI Tolerances committee in a 19th floor room facing an adjacent construction site was the perfect setup.
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The CSDA is one of the associations that joined with related organizations from around the world to create IACDS in 1995, and then worked together with IACDS members to determine useful tolerances applicable to this type of work. Originally developed in 2002, the IACDS standard was updated in 2006...
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Colin Milberg and his team from San Diego State University (SDSU) will have their laser scanning setup on display as one of the exhibits at the ACI Convention in Los Angeles.
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ASTM subcommittee C09.60, which deals with testing fresh concrete, met in Tampa, Fla., in December to consider, revisions proposed to ASTM C231-04, “Standard Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method.”
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Spactial imaging allows us to go beyond checking wall sections with a straightedge.
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There was a huge amount of energy and enthusiasm in the room when the ACI Committee 117, Tolerances, met in Puerto Rico in October. One interesting item discussed was a change in the measurement protocol for slab thickness testing.
Sometimes we get complacent and begin to take for granted some truly amazing things that happen all around us every day, like Colin Milberg's laser scanning system, which he is using to gather and analyze data from which he hopes to derive more rational construction tolerances for building with...
This summer the San Diego State University students who signed on to help Colin Milberg collect data for his construction tolerance project learned something they wouldn't get through even the best classroom simulation.
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Constructing the various elements of a project within the specified tolerances is only one part of a contractor's challenge. The larger, and often more costly, problem is resolving tolerance incompatibilities.
This past June, thanks to teleconferencing, I was able to sit in on the kickoff meeting for Colin Milberg's "Improved Tolerance Management in Concrete Construction" project.
Colin Milberg, Ph.D. is convinced there is a more rational way to come up with better tolerance values using state-of-the art technology.
If you have not looked at American Concrete Institute's (ACI) new tolerance standard, you could be missing a good opportunity to begin simplifying how you look at and resolve design and construction issues related to tolerances.