The concrete alkali content rapid measuring instrument is an apparatus for rapidly determining the alkali content of water-soluble substances such as concrete, sandstone, and admixture by ion selective electrode ISE method.
main feature
1. Rapid measurement of concrete alkali content
2. Unique anti-ion interfering agent to enhance the ion concentration and remove the interference of various metals
3. High-precision potassium and sodium ion composite electrode, stable performance
4. Large-screen LCD direct display, hand-held printer for instant printing, reasonable operation
5. Unique self-diagnosis function, original PC analysis software
6. Large-capacity data storage for storing 100 test data
7 continuous data recording, safe and reliable
Executive standard
1. "Concrete alkali content limit standard" CECS 53:93
2. "Standard for Durability Assessment of Concrete Structures" CECS 220:2007
working principle
The ion content of water-soluble substances such as concrete, sandstone, and admixtures is quickly determined by ion selective electrode ISE method. Pre-treat concrete or other samples during use. The two pre-activated and calibrated electrodes were immersed in the mixed solution as indicated, one measuring the sodium ion content and the other measuring the potassium ion content. The instrument can be converted into Na2O and K2O content (%) by using the measured voltage data (mv), and the concrete alkali percentage Na2O (%) is automatically obtained after inputting the result into the calculation formula in the host. Each experiment took only 10 minutes after electrode activation.
Test procedure
Activation electrode
2. Weigh the sample and pretreat according to the instructions.
3. Calibrate the electrode and measure the sample to be tested
4. Display measurement data
testing object
Fresh concrete, wet concrete and concrete raw materials.
What is the calculated value of cement alkali content?
Usually expressed in sodium equivalent (Na2Oaq), the formula is:
Na2Oaq = Na2O + 0.658K2O
When compared to the requirements of low alkali cement, it is generally required that the sodium equivalent (Na2Oaq) in the cement is less than 0.6%.
Reaction conditions
An alkali active substance in the aggregate;
a sufficient amount of alkali in the concrete (mainly from cement), alkali content > 3.0kg / m3;
The project is under certain humidity conditions.
The concrete alkali aggregate reaction will occur when the above three conditions are present at the same time. Otherwise, the alkali aggregate reaction does not occur.
Improvement measures (use object)
Reducing the total amount of cement and using slag powder instead can effectively reduce the total alkali content in concrete.
Choose a low sodium sulfate water reducer. Among the mainstream high-efficiency water-reducing agents in the market, the Na2(SO)4 content varies from 2 to 20%. The influence on the total alkali content of concrete cannot be ignored.
Use inactive aggregates.
Non-long-term wet parts do not have to emphasize low alkali requirements
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