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Significance and Use
4.1 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.
4.2 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 , , , , , , and Test Method .
4.3 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.
4.4 Additional sampling guidance is provided in Practice concerning probability sampling, Practice concerning choosing sample sizes to estimate the average quality of a lot or process (see ), and in Practice for acceptance of evidence based on results of probability sampling.
Note 2: The guidance contained in Practice is not available in other documents referenced in this section.
4.5 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 weigh the samples in order to maintain a fair and defensible sampling process.
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 utilize the table of four-digit numbers given in .
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.3 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
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 Number Code 91.100.01 (Construction materials)
|Link to Active (This link will always route to the current Active version of the standard.)|
ASTM D3665-12(2017), Standard Practice for Random Sampling of Construction Materials, ASTM International, West Conshohocken, PA, 2017, www.astm.orgBack to Top