NJAL-H rapid concrete alkali tester

Product Application:
Concrete materials contain alkali (potassium ion, sodium ion).When the concrete is in the sufficient moisture environment after a period of time, the concrete bases alkali (potassium ion, sodium ion) will react with the active silicon in the thickness aggregate. The reaction will cause the expansion of the structure and cracking, means the alkali-aggregate reaction. As the alkali-aggregate reaction will cause harmful effects to concrete structures, both domestic and foreign departments take great attention to concrete alkali content limits.
According to “Standard for Maximum Alkali Content in Concrete” CECS 53：93 ，“Standard for Durability Assessment of Concrete Structures” CECS 220：2007 and some other relevant standards, the concrete alkali content refers to the equivalent oxidation sodium content in the concrete ,by kg/m3. The alkali content of the concrete raw material refers to the equivalent oxidation sodium content in the concrete raw materials, by weight percentage (%). And the oxidation sodium content is equivalent to the sum of the oxidation potassium plus the oxidation sodium times 0.658, namely