タイトルまたは説明
Detection method:ISE (Ion Selective Electrode)
Test indicators:the alkali content of concrete and raw
materials, means the equivalent content of sodium oxide Na2O
(%)
Product Model: NJAL-H
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
*3:*3, “Standard for Durability Assessment of Concrete Structures”
CECS **0:***7 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.**8, namely "the equivalent
oxidation sodium content= Na2O + 0.**8 * K2O".
The apparatus adopts Ion Selective Electrode method
(ISE), and it uses the United States imported composite potassium
Ion Electrode and composite sodium ions Electrode to rapidly test
the alkali content (%) of the concrete (including fresh concrete,
wet concrete, hard concrete powdery sample, etc) and the concrete
raw materials (including the cement, chemical additive, admixtures,
etc.) at room temperature
Executive Standard
1. ‘Standard for Maximum Alkali
Content in Concrete’ CECS *3: *3
2. ‘Standard for Durability Assessment of Concrete Structures’ CECS
**0:***7
Product features:
1. *0minutes test cycle to rapidly test the concrete alkali
content
2. Specific anti-ion interference agent, strengthen ion
concentration and remove all kinds of metal interference effect in
the same time
3. High precision potassium, sodium ions composite electrode,
stable performance
4. Large LCD screen straight display, hand-held printer for
instant printing, operation is reasonable
5. Unique self-diagnosis function, original PC analysis
software
6. Great data storage capacity, can store **0 test data
7. Data record continuous, safe and reliable
Test object:fresh concrete, wet concrete and concrete
raw material
Detection principle:
NJAL-H rapid concrete alkali
tester adopts ion selective electrode method (ISE method) rapidly
to test the alkali content of the water-soluble matter, such as
concrete, gravel, and additive.
The concrete or other samples should be pretreated before usage.
Put the two prior activated and calibrated electrode into the
mixture according to the instructions, one of the electrode tests
the sodium ion content, the other one tests the potassium ion
content. The instrument can turn the tested voltage data (mv) into
Na2O and K2O content (%) through the calibration curve. After
filling the result to the host calculation formula, it will
automatically get the Na2O percentage (%) of the concrete alkali
content. After the electrode activation, each experiment process
will need only *0 minutes.
Technical parameters:
Power voltage: AC **0V
Working voltage: DC 3.6V
Test precision: =<*0%
Printer working voltage: DC 5V
Data storage capacity: **0
Pc communication parameters: ***0 baud rate
Acquisition cycle: =<3min
Standby time: >*4 hr
Weight: **0g
LCD SCREEN dimension: **8***8
Test step:
1) Activate electrode
2) Weight and pretreat the samples according to the
instructions
3) Calibrate electrode and test the sample solution
4) display measured data
Test results:
1) Concrete alkali content percentage (%)
2) Concrete oxidation sodium percentage(%)
3) Concrete oxidation potassium percentage(%
Measuring range: 0.**1% ~ *0.**0%
Measuring precision: +/**0%
Operating temperature: 0centigrade ~ *5 centigrade
Resolution: 0.**1.
System Configuration
1.NJAL-H rapid concrete alkali
tester
2.Composite sodium ion Electrode
3.Composite potassium ion Electrode
4.Calibrated solution, ionic strength adjustor
5.Charger
6.Hand-held micro-printer
7. PC computer software