National Standard of Calcined Gypsum

Sep. 20, 2017

National Standard of Calcined Gypsum

  Standard No.: GB/T 9776-2008

  1. Scope of application:

  Gelled material made by dehydrating natural gypsum(raw material). Its main component isβ-GaSO4·1/2H2O, without any admixture or additive.

  The natural gypsum should be in conformity with requirements of “gypsum rock(JC/T700) for making cementing material” gypsum rock of Grade 3 or more higher grades.

  2. Classification:

  It is classified to be three grades: 3.0,2.0,and 1.6 according to its 2h strength(breaking strength).

  3. Composition:

  β-GaSO4·1/2H2O content(mass fraction) in Calcined gypsum should be not less than 60.0%.

  4. Physical and chemical performance:

Grade

FinenessScreen residue of 0.2mm square screen/%

Setting time

2h strength/MPa

First setting

Final setting

Breaking strength

Compression  strength

3.0

≤10

≥3

≤30

≥3.0

≥6.0

2.0

≥2.0

≥4.0

1.6

≥1.6

≥3.0

    Note: 1Mpa=10.2kgf/cm2


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