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State-of-the-Practice Review of Field-Curing Methods for Evaluating the Strength of Concrete Test Specimens
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2023-04-01
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[PDF-2.46 MB]
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Edition:Interim Report 8/16/20–4/30/23
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Abstract:The American Association of State Highway and Transportation Officials (AASHTO) T 23 standard provides instructions for making and curing concrete test specimens in the field. However, further research is needed to compare the strength of the field-cured specimen with the strength of the actual in-place concrete item. The purpose of this research is to build an understanding of the current state of the practice for field-curing methods. Specifically, the research team conducted a literature review and questionnaire survey to identify the selection criteria and details of field-curing methods. The results of the literature data and survey outcomes indicate most transportation agencies use field-cured cylinders, followed by the maturity method, to decide when to open pavement to traffic or remove formwork or falsework. The most commonly used field method found among transportation agencies was curing the test specimens near (or on) the cast concrete in the same manner as the concrete item represented. The cylindrical specimens are mostly field cured in insulated boxes such as a cooler or under burlap/insulation near the concrete item. In contrast, beams are mostly field cured in a damp sandpit or under burlap/insulation near the concrete item. Other field-curing technologies used by agencies are match curing, SureCureTM cylinder-mold system, piezoelectric sensors, calorimetry, and penetration-resistance tests.
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Content Notes:The first of two reports of the findings of ICT PROJECT R27-219 Influence of Field-Curing Conditions on Strength of Concrete Test Specimens
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