TB/T 2922.5-2002 Translated English of Chinese Standard. (TBT 2922.5-2002, TB/T2922.5-2002, TBT2922.5-2002): Test Method for Alkali Reactivity of Aggregates for Railway Concrete - Rapid Mortar-Bar Method
https://www.chinesestandard.net, 26 janv. 2018 - 10 pages
This Standard specifies the sampling method, apparatus, test procedures, result treatment method, etc. of using the rapid mortar bar method to inspect the alkali reactivity of aggregate for railway concrete.
Laboratory Temperature and Humidity
Result Calculation and Processing
20 times back 20°C±2°C constant temperature 400g of cement Academy of Railway accurate to 0.1g aggregate according Aggregates for Railway Alkali Reactivity alkali-silicate reactivity amount of test-piece ASTM balance with weighing bath or oven China Academy compact for 20 curing container distilled water duration of 14d GB/T Grading mass Immerse the test-piece initial length JC/T knife to scratch layer of mortar length expansion rate length measuring instrument length of test-piece mass percentage Method TB/T Methods for Alkali Mortar Bar Method mortar evenly mortar specimen Na2O and K2O Place the curing place the test-piece placed into 80°C Portland cement probe provisions of 8.7 Railway Concrete Railway Engineering Research Railway Sciences Reactivity of Aggregates rod to compact room for 24h second layer serial standards sieve with pore single test-piece small knife sodium hydroxide tamping rod Test Methods test mould test-piece curing solution test-piece holder test-piece length test-piece surface Three test-pieces water bath