详情
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
