ASTM D3665 - 12

    Standard Practice for Random Sampling of Construction Materials

    Active Standard ASTM D3665 | Developed by Subcommittee: D04.30

    Book of Standards Volume: 04.03


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    Significance and Use

    This practice is useful for determining the location or time, or both, to take a sample in order to minimize any unintentional bias on the part of the person taking the sample.

    Note 1—The effectiveness of this practice in achieving random samples is limited only by the conscientiousness of the user in following the stipulated procedures.

    The selection procedures and examples in this standard provide a practical approach for ensuring that construction material samples are obtained in a random manner. Additional details concerning the number of sample increments, the number of samples, the quantities of material in each, and the procedures for extracting sample increments or samples from the construction lot or process are contained in Practices C172, C183, D75, D140, D979, D5361, and Test Method D345.

    This standard contains examples citing road and paving materials. The concepts outlined herein are applicable to the random sampling of any construction material and can easily be adapted thereto.

    Additional sampling guidance is provided in Practice E105 concerning probability sampling, Practice E122 concerning choosing sample sizes to estimate the average quality of a lot or process (see Note 2), and in Practice E141 for acceptance of evidence based on results of probability sampling.

    Note 2—The guidance contained in Practice E122 is not available in other documents referenced in this section.

    The best and most practical method for ensuring that samples of construction materials include the full range of a construction process is by incorporating a stratified-random sampling procedure into the sampling process. To implement a stratified-random sampling procedure, divide the lot to be sampled into the desired number of equal sublots and randomly sample each sublot in accordance with this standard.

    Note 3—If the sublots are of unequal size, it will likely be necessary to weight the samples in order to maintain a fair and defensible sampling process.

    TABLE 1 Table of Random Numbers

    Column
    Row1234567891011121314151617181920
    10.03560.86970.22050.45380.88270.42250.40080.46150.79010.65000.38380.67230.39780.87750.55880.88290.89800.31080.82040.5809
    20.85800.29900.46440.48710.81630.92630.45620.63370.39340.41410.95210.28790.63610.20210.75890.18700.91830.61490.45690.0378
    30.88680.74460.66520.81730.47980.01170.33240.00970.66680.09630.08750.85820.77170.26690.02310.36480.26850.99280.97930.4411
    40.79400.98920.53290.12330.01210.16330.24660.61420.33810.04450.37710.53090.91930.60720.15770.43870.70380.87570.26570.3006
    50.03050.84230.67660.41900.23740.87530.40630.34080.90210.90390.52360.80830.38720.68300.89370.19570.89380.56090.78410.9078
    60.19900.13790.12760.84250.77000.04680.48820.71970.68320.72650.13920.49440.11930.21910.94280.05980.12530.04380.23640.8283
    70.77720.56410.34720.73820.39210.69470.17950.80530.39940.89870.98210.39760.96810.01330.42190.28470.64990.73250.22500.7163
    80.80620.34160.76870.15190.32640.67580.93570.18540.41550.12000.68620.98270.80000.54740.69310.07300.70220.43520.80450.9308
    90.06530.12960.46140.50700.19890.96250.90500.91090.30740.04700.82190.98120.82770.38980.17250.66580.28570.78110.19730.1144
    100.41810.49710.39420.44480.23190.51550.96580.15950.19790.33770.26420.34300.09450.20110.56890.17310.40440.32480.23430.7948
    110.91740.07140.37890.61530.58210.93470.57900.42540.84050.88050.51250.17030.51230.92500.55210.25500.66230.53140.39740.8612
    120.36360.05330.78530.83930.20790.64860.78690.21270.21430.89660.20070.79180.58690.10630.81770.76620.87170.63790.83770.1199
    130.53000.79170.48380.59330.19100.76450.34950.64840.96020.46020.14010.51210.45410.95850.76760.33360.90760.24650.81210.7186
    140.28630.95750.24810.05180.17650.96790.12990.91310.30510.74470.30260.26380.88310.68350.98930.93800.24780.83690.80630.3094
    150.09190.88350.15160.07380.72190.31440.11180.57790.34480.89880.47710.31940.54350.76600.21730.76130.77410.65320.76550.5319
    160.21160.78350.90010.38240.22470.08260.54510.83010.67770.55740.11680.61110.60030.32330.11760.78560.71480.29570.55070.7956
    170.55830.46570.95000.93210.71940.03130.18990.58290.96500.62730.61640.08010.83590.68470.28800.90490.73900.67290.58070.4152
    180.34550.67930.55160.64130.08060.94890.21050.53730.52760.77420.60700.13990.45790.53580.87960.38890.91180.61810.37490.1136
    190.98090.12770.21210.65640.80960.13390.16510.87280.50600.25620.05750.47960.10250.81650.46590.66530.25320.68480.58960.6978
    200.35440.33320.10760.96230.95700.90050.75180.21240.78160.05240.38520.25640.35720.25380.27430.22390.29280.46890.65610.5525
    210.31070.47200.84570.78800.39410.81840.72610.85090.82180.60540.23630.30960.98510.65750.31800.25150.02050.45510.98010.4422
    220.31050.83020.41880.34040.66030.80520.73170.03760.49590.89920.41750.17980.66740.07720.96460.15470.98170.31330.90120.0555
    230.27950.59320.58580.61590.38320.77830.56360.64650.01490.03690.73730.52680.15440.04650.93590.53980.41540.66650.57700.7976
    240.12220.42300.91370.69060.61600.56120.24250.95980.24750.16520.27740.40590.78710.43230.22820.79700.19640.80500.59350.6852
    250.39330.46390.97410.96160.53430.68530.05680.01090.51990.27070.71380.49320.43080.15840.00590.04670.85500.74070.36160.8418
    260.63750.95080.60630.62710.03920.94620.79960.90330.84930.57890.36680.96850.32730.97630.76810.37850.37160.60960.59910.4977
    270.88280.82250.72130.80260.90420.29410.42870.62980.30620.48360.12670.39650.59900.47370.15630.86100.29980.18160.45400.1608
    280.45280.06770.96070.67350.70480.39270.69130.34800.75530.44960.45270.38290.34610.43930.00620.99740.39890.29660.02730.2672
    290.82410.99130.60510.1978

    1. Scope

    1.1 This practice covers the determination of random locations (or timing) at which samples of construction materials can be taken. For the exact physical procedures for securing the sample, such as a description of the sampling tool, the number of increments needed for a sample, or the size of the sample, reference should be made to the appropriate standard method. The selection procedures in Section 6 utilize the table of four-digit numbers given in Table 1.

    1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    C172 Practice for Sampling Freshly Mixed Concrete

    C183 Practice for Sampling and the Amount of Testing of Hydraulic Cement

    D75 Practice for Sampling Aggregates

    D140 Practice for Sampling Bituminous Materials

    D345 Test Method for Sampling and Testing Calcium Chloride for Roads and Structural Applications

    D979 Practice for Sampling Bituminous Paving Mixtures

    D5361 Practice for Sampling Compacted Bituminous Mixtures for Laboratory Testing

    E105 Practice for Probability Sampling of Materials

    E122 Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or Process

    E141 Practice for Acceptance of Evidence Based on the Results of Probability Sampling


    ICS Code

    ICS Number Code 91.100.01 (Construction materials)

    UNSPSC Code

    UNSPSC Code 30130000(Structural building products)


    DOI: 10.1520/D3665-12

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