ASTM D7705 Alkali Resistance of Fiber Reinforced Polymer used in Construction

ASTM D7705 Alkali Resistance of Fiber Reinforced Polymer used in Construction

ASTM D7705 test technique explains how to assess the alkali resistance of FRP bars used as concrete reinforcing bars. The alkali resistance of FRP bars is determined by immersing them in an aqueous alkali solution and then testing them to failure under tension. The values stated in SI are considered standard.

    Scope:

    This test technique is used to determine alkaline resistance data for material requirements, R&D, quality assurance, and structural design and analysis.

    Procedure:

    ASTM D7705 test technique establishes a uniform requirement for assessing the alkali resistance of FRP bars. Procedure A is used to determine the alkali resistance of FRP specimens without applying any tensile tension. Procedure B is used to determine the alkali resistance of FRP specimens by applying prolonged tensile stress to them. Procedure C is used to determine the alkali resistance of FRP specimens placed in damp concrete under tensile tension for an extended period. The amount of stress that has been endured must be stated.

    Specimen size:

    The specimen should be conditioned at a temperature of 60 ±3 °C (140 ± 5 °F) in alkaline solution.

    Data:

    Mass change of FRP can be calculated by the following formula:

    Mass gain % = W1A ̶ W× 100/W0
    Mass loss % = W0 ̶ W1A   × 100/W0

    W1A = mass of the specimen
    W0 = initial mass of the specimen

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