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  • Long-Term Durability of Cold Weather Concrete: Phase II

    Abstract: Recent laboratory results confirm that it is possible to protect concrete from freezing solely using chemical admixtures and indicate that the amount of admixture required may be significantly less than previously recommended. Researchers have also verified that admixture-based freeze protection can produce concrete that is durable to winter exposure for a minimum of 20 years, through petrographic examination of core specimens obtained from past field demonstrations. Freeze protection for concrete using chemical admixtures alone has been an area of active research for 3 decades; however, the most recent methodology recommends very high addition rates of accelerating and corrosion inhibiting admixtures, which result in significant challenges, including slump loss, rapid setting, and potentially excessive temperature rise. As part of a laboratory study, researchers systematically varied the dosage of freeze protection admixtures used in concrete cured in a 23 °F environment. Preliminary findings indicate that a 50% reduction in admixture dose maintained adequate freeze protection and resulted in compressive strengths exceeding those of room-temperature controls at 7 and 28 days. The combination of improved handling, reduced cost, and verified durability associated with the use of admixtures for freeze protection makes a compelling case for broader adoption of this technique in winter operations
  • Optical and Acoustical Measurement of Ballistic Noise Signatures

    Abstract: Supersonic projectiles in air generate acoustical signatures that are fundamentally related to the projectile’s shape, size, and velocity. These characteristics influence various mechanisms involved in the generation, propagation, decay, and coalescence of acoustic waves. To understand the relationships between projectile shape, size, velocity, and the physical mechanisms involved, an experimental effort captured the acoustic field produced by a range of supersonic projectiles using both conventional pressure sensors and a schlieren imaging system. The results of this ongoing project will elucidate those fundamental mechanisms, enabling more sophisticated tools for detection, classification, localization, and tracking. This paper details the experimental setup, data collection, and preliminary analysis of a series of ballistic projectiles, both idealized and currently in use by the U.S. Military.
  • ERDC’s Cold Regions Research and Engineering Laboratory awarded construction contract for new climatic chamber facility

    On July 9, 2020, the U.S. Army Engineer Research and Development Center announced that the Cold Regions Research and Engineering Laboratory (CRREL) was awarded an Unspecified Minor Military Construction Authority (UMMCA) contract to build a climatic chamber facility on the Hanover, New Hampshire, campus.
  • Cold Regions Research and Engineering Laboratory announces closure of child development center

    The Cold Regions Research and Engineering Laboratory (CRREL) announced June 5 that the child development center currently located at the laboratory in Hanover, New Hampshire, is scheduled to permanently close Sept. 15.
  • CRREL, Area Fire Departments and the NH Department Environmental Services work to contain spill

    The Cold Regions Research and Engineering Laboratory discovered a Number 2 heating oil leak from a boiler at its facility at approximately 4 p.m., Saturday, April 25. The CRREL facility is located at 72 Lyme Road in Hanover. No injuries have been reported. CRREL, along with the Hanover, Lebanon, Hartford and Norwich Fire Departments and the New Hampshire Department for Environmental Services are working together to contain the spill. Residents are asked to stay away from the area at this time.
  • CRREL employee tests positive for COVID-19

    A U.S. Army Engineer Research and Development Center employee assigned to the Cold Regions Research and Engineering Laboratory, based in Hanover, New Hampshire has tested positive for COVID-19. The employee is currently in a quarantine status at home. All personnel who have come into contact with the infected employee have been notified and the laboratory continues to enforce safety measures to protect the workforce. The ERDC is continuing to restrict access to only mission critical personnel and essential services contractors at its facilities in New Hampshire and across the nation. In addition, the organization continues to closely adhere to all official federal and state safety and health directives to protect the workforce and prevent the spread of COVID-19.
  • PUBLICATION NOTICE: Assessment of Field Methods for Measuring Mechanical Properties of Snow

    The US Army Engineer Research and Development Center has published the report/note described and linked below. Approved for public release; distribution is unlimited.Report Number:ERDC/CRREL TR-19-17Title:Assessment of Field Methods for Measuring Mechanical Properties of SnowAuthor(s):Sally A. Shoop, Wendy L. Wieder, Bruce C. Elder, Samuel A. Beal,
  • PUBLICATION NOTICE: Macroscale Salt-Crust Formation on Indoor Playa-Like Test Plots for Dust-Emission Research Applications: Methodology Assessment

    The US Army Engineer Research and Development Center has published the report/note described and linked below. Approved for public release; distribution is unlimited.Report Number:ERDC/CRREL TR-19-16Title:Macroscale Salt-Crust Formation on Indoor Playa-Like Test Plots for Dust-Emission Research Applications: Methodology AssessmentAuthor(s):Matthew
  • PUBLICATION NOTICE: SnowMicroPenetrometer Applications for Winter Vehicle Mobility

    The US Army Engineer Research and Development Center has published the report/note described and linked below. Approved for public release; distribution is unlimited.Report Number:ERDC/CRREL TR-19-14Title:SnowMicroPenetrometer Applications for Winter Vehicle MobilityAuthor(s):Tate G. Meehan, Hans-Peter Marshall, Elias J. Deeb, and Sally A.
  • PUBLICATION NOTICE: WorldIndex Database Update 2018

    The US Army Engineer Research and Development Center has published the report/note described and linked below. Approved for public release; distribution is unlimited.Report Number:ERDC/CRREL TR-19-13Title:WorldIndex Database Update 2018Author(s):Lynette A. Barna, Steven F. Daly, Kathleen F. Jones, and John J. GagnonPurpose/Abstract:The primary