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4. The reaction can presently be divided in two types: Alkali-Silica Reaction (ASR) and Alkali-Carbonate Reaction (ACR). Worldwide, the occurrence of ASR is much more common that the occurrence of ACR. L. Gress University of New Hampshire September 2008 The undesirable expansion of concrete due to a reaction between alkalis in the cement and reactive siliceous aggregates, known as alkali-silica reactivity (ASR), • ASTM C 227 — Test can result in leaching. reactive silica by this test method provides a close approximation of total silica, and, in practice, the colorimetric method is frequently substituted for other more time-consuming techniques. • ASTM C 1260 — Test can be overly severe. C 1260 Test Method for Potential Alkali Reactivity of Aggregates (Mortar-Bar Method) C 1293 Test Method for Concrete Aggregates by Determination of Length Change of Concrete Due to Alkali-Silica Reaction . The reactivity of a rock depends on the type and quantity of reactive minerals present, if any. as reactive when it is not) and false negatives (classifying reactive aggregates as innocuous). SILICA, CRYSTALLINE, by XRD: METHOD 7500, Issue 4, dated 1 5 March 2003 - Page 3 of 9 NIOSH Manual of Analytical Methods (NMAM), Fourth Edition SPECIAL PRECAUTIONS: Avoi d inha li ng silic a d us t [3] . However, appropriate performance testing of specific aggregate sources is recommended to confirm alkali-silica reactivity. ASTM C1293, Standard Test Method for Determination of Length Change of Concrete Due to Alkali-Silica Reaction. Conventional method of test for alkali-silica reaction is very time consuming, as it requires a time of 6 months or more. expansions greater than 0.10 percent are indicative of potentially deleterious expansion. • ASTM C 1293 — Testing period is lengthy and can result in leaching; test is unsuitable The presence of reactive minerals can usually be detected by a trained petrographer. Test methods are discussed in Section 7.6. T HF is extr emely f lamm able a nd shoul d be used in a fum e ho od. A construction site cannot waif for so long period. Silica is generally found in water supplies in three different forms: reactive, colloidal and suspended particles (e.g., sand), with the reactive being that portion of the total dissolved silica that is readily reacted in the standard molybdate colorimetric test, and the colloidal being that which is not. C 1437 Test Method for Determining Flow of Hydraulic Cement Mortar . The accelerated method of testing is still in experimental stage. • Petrography — Tool is useful but depends on skill of petrographer. Irrespective of which method is used and time permitting, the potential for deleterious expansion should be confirmed using ASTM C1293, “Standard Test Method for Determination of Length Change of Concrete Due to Alkali Silica Reaction.” Many consider ASTM C1293, Standard Test Method for Determination of Length Change of Concrete Due to Alkali-Silica Reaction(also known as the concrete prism test or CPT), to be the best test method … This test method is the most reliable for determining the reactivity of aggregates, although it requires one year to complete. 2.2 Alkali-reactive aggregates Alkali-reactive aggregates are aggregates that have been shown to react with alkali hydroxide and/or calcium RAPID TEST METHOD FOR DETERMINING ALKALI-SILICA REACTIVITY EXPANSION IN CONCRETE AND AGGREGATE BY Douglas R. 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