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=='''Summary'''== | =='''Summary'''== |
Revision as of 00:18, 17 April 2014
Eric Kreiger
Eric Kreiger |
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Summary
Eric Kreiger graduated with a Bachelor's degree in Civil Engineering from the Department of Civil and Environmental Engineering and a Minor in Physics from Michigan Technological University in 2009. In 2008 he conducted research in concrete materials, specifically on the partial replacement of portland cement with supplementary cementitious materials (fly ash, blast furnace slag, and limestone dust) under Dr. Karl Peterson.
Eric graduated in 2012 with a Master's degree in Civil (Structural) Engineering from Department of Civil and Environmental Engineering at Michigan Tech. He conducted research in concrete materials (conventional concrete, geopolymer concrete, and ultra-high performance concrete). His thesis work was advised by Dr. Tess Ahlborn and focused on the post cracking behavior of ultra-high performance concrete (UHPC). During 2013, Eric is performing research related to building energy performance, analyzing possible thermal bridges in common military building envelope assemblies as an ORISE fellowship participant at theUS Army Construction Engineering Research Labratory.
Eric is currently designing buildings and gaining experience towards becoming a professional engineer.
Interests
Construction Materials
Concrete
Concrete is the most used construction material in the world, but its use comes with a price. The production of portland cement is associated with large amounts of CO2 emissions. The promotion of greener concrete materials for new structures, and development of solutions to repair failing concrete building components can lead to more sustainable structures.
Eric's interest in concrete includes the concrete structures, concrete chemistry, concrete fracture, fiber reinforced concrete, ultra-high performance concrete, geopolymer concrete, and utilization of more sustainable concrete materials.
Building Condition Assessment
Remediation of Existing and Historical Building
Building Performance
Thermal Bridging
Thermal bridging is the transfer of heat by means of a material with higher conductivity (e.g. steel) bridging a material with lower conductivity (e. g. insulation). The implementation of methods to mitigate existing thermal bridges and the utilization of design procedures to prevent their occurrence is of great interest.
Condensation Issues
Condensation exposure over long periods of time is detrimental to the longevity of building components. Moisture issues can be caused by air infiltration/exfiltration, air flow, thermal bridges, and moisture transport in porous media, all of which may lead building enclosure failure or even structural failure. The prevention of moisture through proper climate considerations, enclosure design, and space conditioning is of utmost importance to the prevention and mitigation of condensation issues.
Research
A look at the effects of the partial replacement of portland cement on the mechanical strength, material properties, and durbility of concrete
A variety of concrete mix designs using sumplimentary cementitious materials (SCM), including Fly Ash, blast furnace slag, and limestone dust, were tested for the Michigan Department of Transportation for comparison against a typical concrete mix. Prior to testing, research was done to determine the effects of SCMs on the mechanical properties and chemistry of concrete. Testing included the determination of compressive strength, freeze-thaw durability, air content by air void analysis, and material characterization by scanning electron microscopy.
The development of a design model to determine the the post cracking capacity of a steel fiber reinforced ultra-high performance concrete
Over 250 three-point bending tests were performed in a parametric study to determine the post cracking behavior of a steel fiber reinforced ultra-high performance concrete (UHPC). Testing was done on centralized notched prisms with variations in the curing age, fiber content, span-to-depth ratio, cross-section, and method of curing (ambient curing vs. heat and moisture curing). Preparations for testing and data analysis included the development of a specimen preparation and testing procedure, as well as a background study on fiber reinforced concrete, UHPC, composite materials, fracture mechanics, and fracture testing. The results of this research determined that the entire load-crack displacement curve and fracture energy could be described by a modified Weibull distribution equation.
The development of a technical paper based on this research is currently in the works.
Literature Review (coming soon)
An assesment of the thermal performance of blast resitant windows
A review of common army facility enclosure types and blast resistant window systems was performed in order to develop a heat transfer model in HEAT3. Prior to modelling information was gathered on blast resistant design procedures and standards (DOD Unified Facilities Criteria and Protective Design Center technical reports), ASHRAE standards (90.1, 189.1, 1365), ISO 10211, the International Energy Conservation Code, and several papers on thermal bridging. Results of a similar model without the blast resistant anchor system was also analyzed using THERM.