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:
² Power
voltage: AC **0V
² Working
voltage: DC 3.6V
² Test
precision: =*4 hr
² Weight:
**0g
² 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