1.凝结硬化时体积微膨胀

1. Slight volume expansion during solidification hardening

石膏浆体在凝结硬化初期会产生微膨胀。这一性质石膏制品的表面光滑、细腻、尺寸精确，形体饱满、装饰性好。

Gypsum slurry will experience slight expansion during the initial stage of solidification and hardening. The surface of gypsum products with this property is smooth, delicate, with precise dimensions, full form, and good decorative properties.

2.具有一定的调湿性

2. Has a certain degree of humidity regulation

由于石膏制品内部大量毛细孔院对空气中的水蒸气具有较强的吸附能力，所以对室内的空气湿度有一定的调节作用。

Due to the large number of capillary pores inside gypsum products, they have a strong adsorption capacity for water vapor in the air, so they have a certain regulating effect on indoor air humidity.

3.耐水性、抗冻性差

3. Poor water resistance and frost resistance

建筑石膏粉硬化体的吸湿性强，吸收的水分会减弱石膏晶粒间的结合力，使强度显著降低;若长期漫水，还会因二水石膏晶体逐渐溶解而导致破坏。石膏粉制品吸水饱和后受冻，会因孔隙中水分结晶膨胀而破坏。所以，石膏粉制品的耐水性和抗冻性较差，不宜用于潮湿部位。为提高其耐水性，可加入适量的水泥、矿渣等水硬性材料，也可加入有机防水刻等，可改善石膏粉制品的孔,隙状态或使孔,壁具有增水性。

The moisture absorption of building gypsum powder hardened body is strong, and the absorbed moisture will weaken the bonding force between gypsum grains, resulting in a significant decrease in strength; If it is flooded for a long time, it will also be damaged due to the gradual dissolution of dihydrate gypsum crystals. Gypsum powder products, when saturated with water and frozen, will be damaged due to the crystallization and expansion of water in the pores. Therefore, gypsum powder products have poor water resistance and frost resistance, and are not suitable for use in damp areas. To improve its water resistance, an appropriate amount of hydraulic materials such as cement and slag can be added, and organic waterproof materials can also be added to improve the pore and gap state of gypsum powder products or make the pores and walls have water increasing properties.

4.凝结硬化快

4. Rapid solidification and hardening

建筑石膏粉在加水拌合后，浆体在几分钟内便开始失去可塑性，30min内完全失去可塑性而产生强度，大约一星期左右完全硬化。为满足施工要求，需要加入缓凝剂，如硼砂、酒石酸钾钠、柠檬酸、聚乙烯醇、石灰活化骨胶或皮胶等。

After mixing with water, the building gypsum powder begins to lose its plasticity within a few minutes, completely losing its plasticity within 30 minutes and producing strength. It hardens completely in about a week. To meet construction requirements, it is necessary to add retarders such as borax, potassium sodium tartrate, citric acid, polyvinyl alcohol, lime activated bone glue or skin glue.

5.防火性好

5. Good fire resistance

石膏制品在遇火灾时，二水石膏将脱出结晶水，吸热蒸发，并在制品表面形成蒸汽幕和脱水物隔热层，可有效减少火焰对内部结构的危害。建策石膏制品在防火的同时自身也会遭到损坏，而且石膏制品也不宜长期用于靠近65°C以上高温的部位，以免二水石膏在此温度下失去结晶水，从而失去强度。

When gypsum products encounter a fire, dihydrate gypsum will release crystalline water, absorb heat and evaporate, and form a steam curtain and dehydrated material insulation layer on the surface of the product, which can effectively reduce the harm of flames to the internal structure. Jiance gypsum products can also be damaged while preventing fire, and gypsum products should not be used for a long time near high temperatures above 65 ° C to prevent dihydrate gypsum from losing its crystalline water and strength at this temperature.

6.孔隙率大

6. High porosity

建筑石膏在拌合时，为使浆体具有施工要求的可塑性，需加入石膏用量60%~的用水量，而建筑石膏水化的理论需水量为18.6%，所以大量的自由水在蒸发时，在建筑石膏制品内部形成大量的毛细孔隙。导热系数小，吸声性较好属于轻质保温材料。

When mixing building gypsum, in order to make the slurry have the required plasticity for construction, a water consumption of 60% to 60% of gypsum needs to be added, and the theoretical water demand for building gypsum hydration is 18.6%. Therefore, a large amount of free water forms a large number of capillary pores inside the building gypsum product during evaporation. Low thermal conductivity and good sound absorption belong to lightweight insulation materials.

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