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The American Society for Testing and Materials (ASTM International) has developed different standardized test methods for screening aggregates for their susceptibility to ASR: ASTM C227: "Test Method for Potential Alkali Reactivity of Cement-Aggregate Combinations (Mortar-Bar Method)"
The U.S. Food and Drug Administration (FDA) defines analyte specific reagents (ASRs) in 21 CFR 864.4020 as “antibodies, both polyclonal and monoclonal, specific receptor proteins, ligands, nucleic acid sequences, and similar reagents which, through specific binding or chemical reaction with substances in a specimen, are intended to be used in a diagnostic application for identification and ...
Alkali–aggregate reaction is a term mainly referring to a reaction which occurs over time in concrete between the highly alkaline cement paste and non-crystalline silicon dioxide, which is found in many common aggregates. This reaction can cause the expansion of the altered aggregate, leading to spalling and loss of strength of concrete.
On the surface of concrete pavements, the ASR can also cause pop-outs, i.e. the expulsion of small cones (up to 3 cm (1 in) in diameter), corresponding to aggregate particle size. A quite similar reaction (alkali-silicate reaction) can occur when clay minerals are present in some impure aggregates, and it may also lead to destructive expansion.
Asr (radar), an Iranian radar system; Arithmetic shift right, a computer instruction; Answer-seizure ratio, the percentage of telephone calls that are answered; Traction control system, from German Antriebsschlupfregelung (Acceleration Slip Regulation), system to prevent loss of traction on vehicles; Automatic Send Receive on a teletype
The alkali–carbonate reaction is an alteration process first suspected in the 1950s in Canada for the degradation of concrete containing dolomite aggregates. [1] [2]Alkali from the cement might react with the dolomite crystals present in the aggregate inducing the production of brucite, (MgOH) 2, and calcite (CaCO 3).
ASR Automotive Shredder Residue; ASSURE Association for Sustainable Use and Recovery of Resources; ATEX Atmosphères Explosives Directive 94/9/EC; ATF Authorised Treatment Facility (e.g. for the treatment of end-of-life vehicles (see ELV) and waste electrical and electronic equipment (see WEEE)) ATT Advanced Thermal Treatment; AV Abandoned ...
It also reduces the deterioration of concrete by Alkali Silica Reaction (ASR), particularly useful when using recycled crushed glass or glass fines as aggregate. [6] The amount of slaked lime that can be bound by metakaolin is measured by the modified Chapelle test. [7] [8]