ZhiMeiTang (Jingmen) New Materials Co., Ltd
Craftsmanship · Focused on research and development · α type high-strength gypsum · Ultra high strength self leveling mortar
图1 SGT法α半水脱硫石膏(100倍)

SGT method α high-strength gypsum



The "SGT method" for the growth and crystallization of α - gypsum crystals involves dehydrating dihydrate gypsum in a closed container through the action of steam pressure and a crystallization agent to form α - hemihydrate gypsum.

The SGT method is jointly developed by Hubei Zhengxianda Environmental Protection Technology Co., Ltd. and Hubei ZhiMeiTang Gypsum New Technology Co., Ltd. Zhengxianda is responsible for process technology design, equipment development and manufacturing, and quality control, while ZhiMeiTang is responsible for process, testing, and application technology.

The SGT method results in coarse α - hemihydrate gypsum crystals with clear short columnar contours (see left figure). Its gel hardening body has high strength, with a 2-hour flexural and drying compressive strength that meets the strength grade of α 40 to α 50 in the building materials industry standard JC/T 2038-2010 (technical parameters are shown in Table 1 below).


Testing Items

Standard Requirements

Detection Result

Powder state

Uniform and without lumps

Light yellow, uniform, without lumps

whiteness

Actual measurement value

46.6

fineness

0.3mm sieve residue<1.0%

0.1%

0.15mm sieve residue<10%

0.2%

Odor (wet basis)

no smell

not have

pH

≥5

6

requirement of normal consistency

＜65%

35%（180mm）

setting time

Initial setting

≥3min

11min

Final set

≤30min

15min

2-hour intensity

flexural

≥3.5MPa

5.6MPa

Compression resistance


20.9MPa

Absolute dry strength

flexural


12.0MPa

Compression resistance

≥25MPa

49.6MPa

expansivity


0.367%



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