Laboratory Cement Blaine Specific Surface Area Tester

一、Specification

Accord with GB/T8074—2008 state standard we develop the new model SZB-9 Auto Ratio surface tester. The machine is controlled by computer, and operated by soft touch keys, auto control total test process. Auto remember the coefficient, display the ratio surface area value directly after test work finished, it also can auto remember the test time.

2.

The BET (Brunauer, Emmett and Teller) theory is commonly used to evaluate the gas adsorption data and generate a specific surface area result expressed in units of area per mass of sample (m2/g). The technique is referenced by several standard organizations such as ISO, USP and ASTM.

This method is widely used for most materials, but is most reliable for materials with a Type II or Type IV isotherm with sufficient level of interaction between the adsorbate gas and the surface. For materials with other types of isotherms, the BET theory may not apply for various reasons and therefore should be treated with caution.

Prior to analysis, the sample must be preconditioned to remove physically bonded impurities from the surface of the powder in a process called degassing or outgassing. This is typically accomplished by applying elevated temperature to the sample in conjunction with vacuum or continuously flowing inert gas. This process must be carefully controlled and monitored in order to generate the most accurate and repeatable results

3.

1.Power supply voltage: 220V±10%

2．Time count range: 0.1second to 999.9 seconds

3．Time count precision: <0.2 second

4．Measurement precision: ≤1‰

5．Temperature range: 8-34℃

6．Ratio surface area number S: 0.1-9999.9cm2/g

三： Operate board description

uDisplay area

Is LCD screen, display area.

v Operation area

Formed with 8 keys, include 【Left】【Right】【Up】【Down】【Reset】【S value】【K value】【Enter】

四: Instrument elements

u Concrete ratio area indicate the total area of concrete powder.

v The method depended on mensurable air through in mensurable interspace and fixed thickness concrete layer, different resistance can bring different flow speed, and use this elements to test concrete ratio surface area.

w According the standard GB/T807-2008 commendatory calculate formula

S—The Ratio area of test sample, SS— The Ratio area of standard powder, cm2/g

T—The liquid limit down times of test sample, TS— The standard powder liquid down times, seconds.

η—The air mucosity when test sample in instant temperature, μPa∙s

ηs—The air mucosity when standard powder in instant temperature,μPa∙s

ρ—Density of test sample, ρs—Density of standard test sample, g/cm3

ε—Interspace rate of test sample, εs—Interface rate of standard test sample

In above calculate formula, the Because the standard powderεs is fixed, and is 0.5, so use the value correctly.

五、：Test and demarcation

1）。Use the rubber gag seal the bucket edge then test, set necessary parameter then start instrument. When instrument auto stop, check the liquid face if is down, and normal status is no down.

2）Sample layer volume test

六、Test process

1) Sample prepared

2) Confirm the sample quantity

3)Sample layer made

●GB/T8074-2008 Other had not referred, you can refer Standard GB/T8074-2008