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Material Specifications Flashcards

7 cards from real NETTCP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. Which AASHTO soil classification group is generally considered unsuitable as a subgrade material without treatment?

    Answer: A-7-6

    A-7-6 soils are highly plastic clays with poor load-bearing characteristics and are generally unsuitable as subgrade without stabilization or replacement.

  2. For structural steel used in highway bridges, which ASTM grade is most commonly specified for rolled W-shapes?

    Answer: ASTM A709 Grade 50

    ASTM A709 Grade 50 is the bridge-specific structural steel specification most commonly used for rolled W-shapes in highway bridges.

  3. What is the purpose of specifying a maximum water-to-cementitious-material (w/cm) ratio in bridge concrete?

    Answer: To limit permeability and improve durability against chloride intrusion

    A lower w/cm ratio reduces concrete permeability, limiting chloride ion penetration and protecting reinforcing steel from corrosion.

  4. According to AASHTO M 29, what is the standard specification for fine aggregate (sand) used in bituminous mixtures?

    Answer: It covers natural sand, manufactured sand, and screenings meeting specific gradation and quality requirements

    AASHTO M 29 covers fine aggregate from natural or manufactured sources used in asphalt mixtures, including gradation and quality limits.

  5. Fly ash used as a supplementary cementitious material in concrete must conform to which ASTM standard?

    Answer: ASTM C618

    ASTM C618 specifies requirements for natural pozzolans and fly ash used as supplementary cementitious materials in concrete.

  6. For highway guardrail, which ASTM specification covers the W-beam rail element material?

    Answer: ASTM A36 or A572

    W-beam guardrail is fabricated from steel meeting ASTM A36 or A572 requirements for structural carbon steel.

  7. What characteristic distinguishes a Superpave SP-12.5 mix designation from an SP-19 mix?

    Answer: SP-12.5 has a nominal maximum aggregate size of 12.5 mm versus 19 mm for SP-19

    The number in a Superpave mix designation (SP-12.5, SP-19) refers to the nominal maximum aggregate size in millimeters.