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    Mandrel test [Image 3 of 5]

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    The image is a side-by-side comparison showing two stages of a utility conduit or duct bank installation/maintenance operation in a concrete structure. Multiple circular conduit openings are visible in a concrete wall, with a worker in high-visibility gear present in the right panel. The left panel shows an initial state with a pull line or mandrel inserted, while the right panel shows a sealed or plugged conduit with a ratchet strap securing the assembly.

    GUAM

    06.21.2026

    Photo by Robert Balajadia 

    Office in Charge of Construction Marine Corps Marianas

    A mandrel test is performed on a newly installed underground duct bank. This crucial quality control check ensures the long-term reliability and integrity of the base's essential utility infrastructure.

    IMAGE INFO

    Date Taken: 06.21.2026
    Date Posted: 06.25.2026 19:45
    Photo ID: 9774035
    VIRIN: 062626-N-YH612-1038
    Resolution: 633x423
    Size: 99.46 KB
    Location: GU
    Web Views: 22
    Downloads: 2

    PUBLIC DOMAIN  

    This work, Mandrel test [Image 5 of 5], by Robert Balajadia, identified by DVIDS, must comply with the restrictions shown on https://www.dvidshub.net/about/copyright.

    GALLERY

    The image shows a large construction site featuring a freshly paved asphalt surface, likely a parking lot, apron, or airfield. Multiple light poles and structural elements are visible in the background, along with partially constructed buildings. The site appears to be in an active phase of development with construction equipment and workers faintly visible.
    An active civil engineering construction site showing a deep open excavation trench with reinforced concrete formwork being assembled. Workers are visible on the elevated formwork platform, likely preparing for a concrete pour for what appears to be a box culvert or underground drainage structure. Heavy equipment and earthwork spoil piles are visible in the background.
    The image is a side-by-side comparison showing two stages of a utility conduit or duct bank installation/maintenance operation in a concrete structure. Multiple circular conduit openings are visible in a concrete wall, with a worker in high-visibility gear present in the right panel. The left panel shows an initial state with a pull line or mandrel inserted, while the right panel shows a sealed or plugged conduit with a ratchet strap securing the assembly.
    The image shows a newly constructed or recently completed two-story institutional building with the address number 3175 visible on its facade. The building features a prominent observation or watch tower, blue trim roofing, and a second-floor balcony with railings, suggesting it may be a military, government, or emergency services facility. Construction equipment is still present on site, indicating the facility may not yet be fully operational.
    A newly paved road intersection is shown with fresh pavement markings, including a 'STOP' text and directional arrows painted in white, along with a double yellow center line. Workers in high-visibility yellow vests are visible in the background, suggesting the road construction or resurfacing project is still in progress. The surrounding area shows signs of recent storm or construction activity, with palm trees, utility poles, and construction materials visible.

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