Details
Posted: 05-Apr-24
Location: Gaithersburg, Maryland
Type: Full-time
Salary: Open
Categories:
Academic/Faculty
Other - Academic/Faculty
Internal Number: A-143868-26
General Description
Title: Understanding Concrete Foundation Deterioration by Modeling the Impact of Pyrrhotite
Project Description:
Damage to concrete structures in residential and commercial construction in central Connecticut has been attributed to the iron sulfide mineral pyrrhotite. Iron sulfides in concrete aggregate are not desirable as their relative instability results in decomposition with associated staining, expansion, and pop-outs near concrete surfaces or, in severe cases, cracking of the structure. There are no standardized test methods to assess pyrrhotite occurrence and abundance in aggregate or in concrete due to its low concentrations while still having a significant impact. Developing a standard test method, including a set of calibration reference standards will provide a means for accurate, consistent analysis of pyrrhotite in concrete. An improved understanding, based on modeling and experimental data, of the pyrrhotite/aggregate/concrete reaction types, reaction rates, and reaction product impact on concrete expansion, is needed so that the most deleterious reactions can be efficiently reduced or eliminated.
In this opportunity, the PREP researcher will develop models to better understand the microstructural characteristics relevant to the internal sulfate expansion phenomena, including its volume expansion.
The PREP researcher will be responsible for activities associated with:
1) chemo-mechanical modeling to simulate the expansion and the damage in concrete,
2) moisture transport modeling that considers the distressed concrete due to pyrrhotite,
3) surface coating simulation modeling,
4) interfacing with NIST experimentalists to support and validate modeling work,
5) analyzing modeling results and drafting manuscripts.
Qualifications
Ph.D in Chemistry/ Physics/ Mechanical Engineering/ Chemical Engineering/ Civil Engineering
Application Instructions
Pleas eincldue the follwoing below:
C.V
2 professional references
Privacy Act Statement
Authority: 15 U.S.C. § 278g-1(e)(1) and (e)(3) and 15 U.S.C. § 272(b) and (c)
Purpose: The National Institute for Standards and Technology (NIST) hosts the Professional Research Experience Program (PREP) which is designed to provide valuable laboratory experience and financial assistance to undergraduates, post-bachelor's degree holders, graduate students, master's degree holders, postdocs, and faculty.
PREP is a 5-year cooperative agreement between NIST laboratories and participating PREP Universities to establish a collaborative research relationship between NIST and U.S. institutions of higher education in the following disciplines including (but may not be limited to) biochemistry, biological sciences, chemistry, computer science, engineering, electronics, materials science, mathematics, nanoscale science, neutron science, physical science, physics, and statistics. This collection of information is needed to facilitate administrative functions of the PREP Program.
Routine Uses: NIST will use the information collected to perform the requisite reviews of the applications to determine eligibility, and to meet programmatic requirements. Disclosure of this information is also subject to all the published routine uses as identified in the Privacy Act System of Records Notices: NIST-1: NIST Associates.
Disclosure: Furnishing this information is voluntary. When you submit the form, you are indicating your voluntary consent for NIST to use of the information you submit for the purpose stated.
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About Johns Hopkins University
Johns Hopkins University remains committed to its founding principle, that education for all students should be grounded in exploration and discovery. Hopkins students are challenged not just to learn but also to advance learning itself. Critical thinking, problem solving, creativity, and entrepreneurship are all encouraged and nourished in this unique educational environment. After more than 130 years, Johns Hopkins remains a world leader in both teaching and research. Faculty members and their research colleagues at the university's Applied Physics Laboratory have each year since 1979 won Johns Hopkins more federal research and development funding than any other university. The university has nine academic divisions and campuses throughout the Baltimore-Washington area. The Krieger School of Arts and Sciences, the Whiting School of Engineering, the School of Education and the Carey Business School are based at the Homewood campus in northern Baltimore. The schools of Medicine, Public Health, and Nursing share a campus in east Baltimore with The Johns Hopkins Hospital. The Peabody Institute, a leading professional school of music, is located on Mount Vernon Place in downtown Bal...timore. The Paul H. Nitze School of Advanced International Studies is located in Washington's Dupont Circle area.
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