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Aw=e <br /> iieST 627 Sheridan Boulevard • Lakewood,CO 80214 <br /> P:303.975.9959 • r:303.975.9969 <br /> office@westest.net • www.westest.net <br /> November 12, 2018 <br /> BURNCO Colorado <br /> 455 W. 115th Avenue Unit 1 <br /> Northglenn, CO 80234 <br /> Attention: Mr. Daniel B. Bentz, P.E. <br /> Subject: Laboratory Test Results <br /> ASTM C 1260 <br /> Potential Alkali Reactivity of Aggregates (Mortar-Bar Method) <br /> ASTM & AASHTO Fine Aggregate <br /> ASTM & AASHTO Size No. 57/67 Coarse Aggregate <br /> Firestone Pit <br /> WesTest Project No. 623118 <br /> Gentlemen: <br /> Included as Figures 1 and 2 are the results of potential alkali reactivity testing (mortar bar <br /> method), performed on aggregate sampled from the above-referenced source on October 8, 2018. <br /> The aggregate was prepared and tested in general accordance with ASTM Procedures. ASTM C <br /> 1260 defines the potential of an aggregate for deleterious expansion as follows: <br /> Test Expansion Classification Potential for Deleterious ASR <br /> <0.10% Innocuous Low <br /> 0.10% to 0.20% Inconclusive Not Predictable <br /> > 0.20% Deleterious High <br /> Based on the test results of 0.04% and 0.06% expansion at 14 days in solution, 16 days after <br /> casting, the potential for deleterious alkali-silica behavior of this aggregate in concrete is <br /> considered Low. <br /> If you have any questions on the data presented, please contact us at your convenience. <br /> Sincerely, Reviewed by: <br /> WesTest p0 LIC <br /> Quyen T. Li I'1 i a 49996 ma's Dylan A. Hullinger, P.E. <br /> '\/UNAO: <br /> CC: Shawn Simmerman and Steve Heinrich <br /> A�ASSH7O- <br />