CME testing and observations
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Transcript of CME testing and observations
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8 Offices: Omaha & Grand Island, NE; Wichita, Kansas City, Salina, Manhattan, KS;Des Moines, IA; Ft. Collins, COGeotechnical ● Environmental ● Material Testing
Geotechnical Services, Inc. ● 9312 G Court, Omaha, Nebraska 68127 ● 402.339.6104 ● www.gsinetwork.com
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Quality: Construction Materials Engineering (CME) Testing and Observations
Nicholas P. Wolff, P.E., Senior Engineer
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“Geotechnical Services, Inc.” is a Registered Provider with The American Institute of Architects Continuing Education Systems (AIA/CES). Credit(s) earned on completion of this program will be reported to AIA/CES for AIA members. Certificates of Completion for both AIA members and non-AIA members are available upon request.
This program is registered with AIA/CES for continuing professional education. As such, it does not include content that may be deemed or construed to be an approval or endorsement by the AIA of any material of construction or any method or manner of handling, using, distributing, or dealing in any material or product.
Questions related to specific materials, methods, and services will be addressed at the conclusion of this presentation.
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Copyright Materials
This presentation is protected by US and International Copyright laws. Reproduction,
distribution, display and use of the presentation without written permission of the speaker is
prohibited.
© Geotechnical Services, Inc. 2010
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Learning Objectives
At the end of this program, participants will be able to:
1. Identify the aspects of a proactive construction testing scope of services on
the review quiz.
2. Identify the five functions of a CME firm on a project site on the review quiz.
3. Identify qualities of project sites with a high appreciation of quality on the
review quiz.
4. Differentiate between Quality Control and Quality Assurance on the review
quiz.
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Outline Discuss Quality as it Pertains to Construction Define Function of Construction Testing Discuss Value of Construction Testing Services Typical Services of Construction Materials
Engineering (CME) Firms with Considerations for Each
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Quality in Construction
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Two Types of Construction Sites High Appreciation of Quality
Testing Viewed as Necessary to Achieve Good Work
Good Flow of Communication Testing Program Developed to Address Key
Concerns Welcomed as a Partner
Low Appreciation of Quality Testing as Method of Assigning
Liability/Responsibility Often Plagued with Communication Problems Frequency of Testing Based on other Criteria Adversarial Welcome
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What is the Role of the CME Firm?
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The Construction Police!
You are only at 93%
Compaction! Do Not Pass Go. Do Not Collect
$200
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Roles Owner – This is What We Want Done Designer – This is How it Should Look When
it’s Done General Contractor – This is When it Needs to
be Done Contractor – This is How I can Get it Done CME Engineer – I Help to Make sure it Gets
Done Well!
We are all Partners in Construction.
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Function of Construction Testing Quality Program Risk Reduction Program Communication Mechanism Field Engineering Presence Verification and Documentation Program
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Advantages of Construction Testing Proactively and/or Quickly Address Problems Eyes on the Scene Manage the Quality Program Expedite Project Increase Peace of Mind Disinterested Party Document for Future
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Two Flavors Quality Control
Internal quality program of the contractor
Quality Assurance External verification of contractor’s program
Or Independent quality program if No QC
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QC vs. QA – Similar But Not the Same Quality Control
I am accountable to the contractor Keep him out of trouble Contractor related pressures Effectiveness proportional to contractor
commitment
Quality Assurance I am accountable to owner and design team Other pressures Keep project “on track” Effectiveness proportional to team’s commitment
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CME - Difficult Role Not manufactured materials Competing concerns
Economy Time Limited sampling Uncertainty Laboratory vs. In-Situ
Engineering Judgment
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What is Engineering Judgment?
“The art of providing recommendations with huge
repercussions, based on limited and sometimes contradictory information, under a number of pressures and in
real time.”
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“Quality is not an act, it is a habit.”
~Aristotle
This isn’t a production process. There is only one
opportunity to get it right.
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How Much Testing is Enough? Quality is an overhead expense (until it isn’t) When problems occur, quality control can be
invaluable in the resolution Performing testing concurrently is inexpensive Testing afterward is:
Expensive Difficult to perform (if not impossible) Time critical
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How Much Testing is Enough?
Less Sampling
More Sampling
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How do you Develop a Testing Scope of Services?
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How Much Testing is Enough?Common Criteria - Reactive Based on Arbitrary Budget What Firms Usually Do Previous Problems Code Requirements
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How Much Testing is Enough?Better Criteria - Proactive In Proportion to Owner’s Appetite for Risk In Proportion to Consequence of Failure In Proportion to Cost of Corrective Action Based on Industry Acknowledged Concerns
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Typical Construction Testing Services & Concerns
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Stripping Why: Organic material settles as it
decomposes – Long term settlement Considerations:
Black isn’t Necessarily Bad Thickness Limits Stockpiling
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Earthwork Why: Risk of settlement decreases in
proportion to degree of compaction Considerations:
Cuts and Fills Moisture Content Equipment Used When to Use Vibratory Compacted Fill Settles
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Utility Trench Backfill Why: Large risk of excessive differential
settlement Considerations:
Backfilling is “incidental” Lift Thickness Control Excavation Safe for Testing Appropriate Compaction Tools
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Proofrolling Why: Quickly evaluate large area under worse
case load Considerations:
After Cut, Before Fill or Covering Truck vs. Roller Rutting vs. Pumping Is it loaded? How is it loaded? Couple with Shallow Probes Need Machine Access
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Foundations Why: Movements Due to Poor Bearing Soils
Can Compromise Structure Considerations:
Loads are Larger and Effects Extend Deeper Corrective Action is Expensive Frost Action Shallow Probe Holes
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Bolted and Welded Connections Why: Failure of Structural Steel Connections
Results in Catastrophic Failure Considerations:
Always Check Contractor Certifications Most Evaluations are Visual Ultrasonic, Dye Penetrant, Mag Particle
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Reinforced Concrete Why: To evaluate strength and durability of
cured concrete Considerations:
Shop drawings vs. plans Immediate results
Air-content Slump Temperature
Deferred results Compressive strength
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Masonry Why: Track record of quality issues Considerations
Geometry Most Important Grout Strength is Important Masonry Prisms Mortar Cubes for Consistency
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Asphalt Why: Longevity of pavement is mix and
installation dependent Considerations
Max Density Rolling Pattern Field Tests
Density Temperature Thickness
Laboratory Cores Mix
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Roof Installation Why: A leaky roof is one of the most costly
problems Considerations
Careful Review Installer Recommendations Ballasted Verify Slope ThermaScan in Warranty Period
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Fireproofing Why: Life Safety Issue During Life of Structure
(Sleep Soundly) Considerations:
Thickness – Average Plus Minimum Density Adhesion
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Other Semi-Common Testing Floor Flatness/Levelness Anchor Bolt Pullout Post Tensioning Pre Stressed Vibration Monitoring Settlement Monitoring Load Testing Pile Integrity Testing EIFS Let’s Get Creative
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Summary Discussed Quality and the Function of
Construction Testing Services Promote High Appreciation of Quality Manage Risk as Collaboratively Agreed Develop a Testing Scope Based on Project’s
Concerns Most Economical Scope to Realize Risk Tolerance
Discuss Value Construction Testing Adds
Provided Overview of Common Testing Services
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“The bitterness of poor quality remains long after low pricing is forgotten!”
~Leon M. Cautillo
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Founded in 1973 Employee owned Veteran owned, small business Services
Geotechnical Engineering Environmental Engineering Construction Testing Drilling
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Course EvaluationsIn order to maintain high-quality learning experiences, please access the evaluation for this course by logging
into CES Discovery and clicking on the Course Evaluation link on the left side of the page.
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Questions