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Determine the percent moisture in an aggregate sample. Some aggregates may contain water that is chemically combined with the minerals in the aggregate.

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For definitions of terms used in this test method, refer to Terminology C 125

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This test method is accurate enough for
purposes, such as adjusting batch quantities of ingredients to concrete. In cases where the aggregate itself is
altered by heat, or when a more refined measurement is required, the test should be performed using a ventilated environment, controlled temperatura oven.

The user of this test method should determine by trial
whether fast-drying methods provide sufficient precision for the Intended use when drying large particles
especially those greater than 50 mm (2 in.)

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5.1 Balance: An accurate, legible, and accurate balance or balance sensitive to within 0.1% of the test load at any point within the range of use of the difference in masses.

5.2 Heat Source—A ventilated oven capable of maintaining the temperature surrounding the sample at 110 6 5 °C (230 6 9°F). Other suitable heat sources may be used, such as a electric or gas hot plate, electric heat lamps or a ventilated system microwave oven.

5.3 Sample Container—A container that is unaffected by heat, of sufficient volume to contain the sample without danger of spill, and in such a way that the depth of the sample does not exceed one-fifth of the least lateral dimension.

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6.1 Sample in accordance with Practice D 75, except for the sample size.

6.2 Secure a sample of the aggregate representative of the moisture content in the supply being tested and having a mass not less than the amount listed in Table 1. Protect the sample against loss of moisture prior to determining the mass.

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.Determinethemassofthesampletothenearest0.1%.
CautionÐWhenusingamicrowaveoven,occasionallymineralsarepresentinaggregatesthatmaycausethe materialtooverheatandexplode.Ifthisoccursitcandamage themicrowaveoven.
WarningÐExercisecaretocontroltheignitionoperationtopreventinjuryordamagefromtheburningalcohol

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Calculatetotalevaporablemoisturecontentasfollows: p5100~W2D!/D(1) where: p=totalevaporablemoisturecontentofsample,percent, W=massoforiginalsample,g,and D=massofdriedsample,g. 8.2Surfacemoisturecontentisequaltothedifference betweenthetotalevaporablemoisturecontentandtheabsorption,withallvaluesbasedonthemassofadrysample. AbsorptionmaybedeterminedinaccordancewithTest MethodC127orTestMethodC128.

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10.1 aggregate; drying; moisture content
caution.
Warning