1.凝結(jié)硬化時體積微膨脹

1. Slight volume expansion during solidification hardening

石膏漿體在凝結(jié)硬化初期會產(chǎn)生微膨脹。這一性質(zhì)石膏制品的表面光滑、細(xì)膩、尺寸精確，形體飽滿、裝飾性好。

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.具有一定的調(diào)濕性

2. Has a certain degree of humidity regulation

由于石膏制品內(nèi)部大量毛細(xì)孔院對空氣中的水蒸氣具有較強的吸附能力，所以對室內(nèi)的空氣濕度有一定的調(diào)節(jié)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、抗凍性差

3. Poor water resistance and frost resistance

建筑石膏粉硬化體的吸濕性強，吸收的水分會減弱石膏晶粒間的結(jié)合力，使強度顯著降低;若長期漫水，還會因二水石膏晶體逐漸溶解而導(dǎo)致破壞。石膏粉制品吸水飽和后受凍，會因孔隙中水分結(jié)晶膨脹而破壞。所以，石膏粉制品的耐水性和抗凍性較差，不宜用于潮濕部位。為提高其耐水性，可加入適量的水泥、礦渣等水硬性材料，也可加入有機防水刻等，可改善石膏粉制品的孔,隙狀態(tài)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.凝結(jié)硬化快

4. Rapid solidification and hardening

建筑石膏粉在加水拌合后，漿體在幾分鐘內(nèi)便開始失去可塑性，30min內(nèi)完全失去可塑性而產(chǎn)生強度，大約一星期左右完全硬化。為滿足施工要求，需要加入緩凝劑，如硼砂、酒石酸鉀鈉、檸檬酸、聚乙烯醇、石灰活化骨膠或皮膠等。

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

石膏制品在遇火災(zāi)時，二水石膏將脫出結(jié)晶水，吸熱蒸發(fā)，并在制品表面形成蒸汽幕和脫水物隔熱層，可有效減少火焰對內(nèi)部結(jié)構(gòu)的危害。建策石膏制品在防火的同時自身也會遭到損壞，而且石膏制品也不宜長期用于靠近65°C以上高溫的部位，以免二水石膏在此溫度下失去結(jié)晶水，從而失去強度。

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

建筑石膏在拌合時，為使?jié){體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論需水量為18.6%，所以大量的自由水在蒸發(fā)時，在建筑石膏制品內(nèi)部形成大量的毛細(xì)孔隙。導(dǎo)熱系數(shù)小，吸聲性較好屬于輕質(zhì)保溫材料。

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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