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within one laboratory is about 9% and the accept- able range of TSR values between two laboratories is about 25%. These values validate the concerns of the highway agencies about the variability of this test method. Chapter 4 of NCHRP Web-Only Docu- ment 166 (4) presents the results of an investigation of the possible causes of this high variability. REFERENCES 1. Azari, H. NCHRP Web-Only Document 163: Preci- sion Estimates of AASHTO T 267: Determination of Organic Content in Soils by Loss on Ignition. TRB, The National Academies, Washington, DC, 2010. (http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_ w163.pdf) 2. Azari, H. NCHRP Web-Only Document 164: Pre- cision Estimates of AASHTO T 265: Laboratory Determination of Moisture Content of Soils. TRB, The National Academies, Washington, DC, 2010. (http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_ w164.pdf) 3. Azari, H. NCHRP Web-Only Document 165: Preci- sion Estimates of AASHTO T 148: Measuring Length of Drilled Concrete Cores. TRB, The National Acad- emies, Washington, DC, 2010. (http://onlinepubs. trb.org/onlinepubs/nchrp/nchrp_w165.pdf) 4. Azari, H., N. Kringos, and T. Scarpas. NCHRP Web-Only Document 166: Precision Estimates of AASHTO T 283: Resistance of Compacted Hot Mix Asphalt (HMA) to Moisture-Induced Damage. TRB, The National Academies, Washington, DC, 2010. (http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_ w166.pdf) 9 Condition of Test and Test Property Standard Deviation 1s Acceptable Range of Two Results d2s Single-Operator Precision 0.033 0.093 Multilaboratory Precision 0.087 0.247 Table 16 Precision estimates of TSR
Transportation Research Board 500 Fifth Street, NW Washington, DC 20001 These digests are issued in order to increase awareness of research results emanating from projects in the Cooperative Research Programs (CRP). Persons wanting to pursue the project subject matter in greater depth should contact the CRP Staff, Transportation Research Board of the National Academies, 500 Fifth Street, NW, Washington, DC 20001. COPYRIGHT INFORMATION Authors herein are responsible for the authenticity of their materials and for obtaining written permissions from publishers or persons who own the copyright to any previously published or copyrighted material used herein. Cooperative Research Programs (CRP) grants permission to reproduce material in this publication for classroom and not-for-profit purposes. Permission is given with the understanding that none of the material will be used to imply TRB, AASHTO, FAA, FHWA, FMCSA, FTA, or Transit Development Corporation endorsement of a particular product, method, or practice. It is expected that those reproducing the material in this document for educational and not-for-profit uses will give appropriate acknowledgment of the source of any reprinted or reproduced material. For other uses of the material, request permission from CRP. Subscriber Categories: Highways ⢠Materials ISBN 978-0-309-15526-7 9 780309 155267 9 0 0 0 0
