An Assessment of Selected Programs at the National Institute of Standards and Technology Engineering Laboratory Fiscal Year 2020 (2021) / Chapter Skim
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5 Engineered Materials for Resilient Infrastructure Program
5 Engineered Materials for Resilient Infrastructure Program
Pages 36-46
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From page 36... ...
The SPHERE program and its unique equipment enables assessment of accelerated weathering and service life prediction by providing a fundamental understanding of the deterioration and aging mechanisms of materials. The staffing appears to be appropriate for the ongoing mission of the program and combines a number of junior and more senior investigators.
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From page 37... ...
The next steps will be to include these factors to provide a more realistic test material to real-world polymer materials containing additives/UV absorbers and transition to a 6-port SPHERE Data/Validation Project, with comparisons to both field and 2m SPHERE data. The deployment of the smaller SPHERE may have a significant impact on industrial manufacturers who want to provide robust and long-lasting construction materials.
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From page 38... ...
This basic understanding will provide the industry with confidence that using 3DCP can in fact raise productivity and provide safe structural capacity to loading. The Infrastructure Materials Group at the EL has the advantage of bringing state-of-the art tools, such as small angle neutron scattering, to link material microstructure to bulk material properties, such as rheology and electrical conductivity.
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From page 39... ...
The development of standard reference materials (SRMs) for concrete reference materials for Portland cement clinkers is recognized and utilized worldwide by cement manufacturers and research laboratories.
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From page 40... ...
As this is a new program, the materials submitted by NIST for this review do not include information about the accomplishments of this research to date, other than providing a grant to the University of Connecticut Civil Engineering Department to work on developing a test method for pyrrhotite in concrete as well as developing a risk assessment model. Challenges and Opportunities This research has great potential to minimize concrete damage due to deleterious aggregates that cause pyrrhotite.
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From page 41... ...
Additional staffing may be required to continue to elevate this area to a leading national effort. Assessing Pyrrhotite in Concrete Accomplishments The technical expertise in the concrete materials team at NIST is well qualified for the goals of the project.
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From page 42... ...
EFFECTIVENESS OF DISSEMINATION OF OUTPUTS SPHERE Operations Accomplishments The project team has prepared 85 technical publications since 2014 that span internal technical reports, 30 peer-reviewed scientific and symposia papers, along with 7 peer-reviewed book chapters and 3 books on service life prediction. Eight standards have been developed with the NIST SPHERE technology.
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From page 43... ...
In addition, one of the members is chair of ACI 564: 3-D Printing with Cementitious Materials, which will continue to provide good visibility to this evolving program The MACE consortium was developed to determine the measurement science needs in this area. With regards to infrastructure, Building 206, where the 3D Concrete Printing project resides, lacks some environmental controls (no air conditioning in the summer)
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From page 44... ...
Opportunities for collaboration with the AM polymers and structural polymers/composites communities would be beneficial in addition to FRP composites for infrastructure repair. RECOMMENDATION: Directed efforts for the use of the SPHERE (Simulated Photodegradation via High Energy Radiant Exposure)
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From page 45... ...
program personnel should continue to link with other NIST efforts on additive manufacturing as well as other ongoing national and international efforts in 3DCP. Direct Assessment of Concrete-Making Materials for Standards and Specifications There is great value in continuance of the research of a rheological test apparatus for viscosity measurement of fresh concrete, with the goal of developing a standard for industry, and great value also in the work on the development of concrete reference materials.
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From page 46... ...
In this effort, atomistic/quantum mechanical modelling should be considered as a way of identifying treatments that poison the breakdown of pyrrhotite to secondary minerals. Portfolio of Expertise Additive Manufacturing with Cement-Based Materials The assembled team and the instrumentation at its disposal is highly competent and appears to be unique.
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