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The 14 references without a DOI — listed, not checked
no DOI — not checkedTRIP: A National Transportation Research Group. Road Information Program, 2004, Washington, D.C. www.tripnet.org. Accessed Aug. 3, 2007.
no DOI — not checkedbibr3-2020-08
no DOI — not checkedHighway Research Board Proceedings
no DOI — not checkedbibr5-2020-08
no DOI — not checkedbibr6-2020-08
no DOI — not checkedbibr7-2020-08
no DOI — not checkedbibr8-2020-08
no DOI — not checkedACI Manual of Concrete Practice
no DOI — not checkedACI Manual of Concrete Practice
no DOI — not checkedACI Manual of Concrete Practice
no DOI — not checkedTransportation Research Circular 494: Durability of Concrete.
no DOI — not checkedbibr13-2020-08
no DOI — not checkedImproved Method for Non-Destructive testing of Concrete Prisms.
no DOI — not checkedResearch and Development Bulletin RD128.
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