Seeing this title, I find it incredible that gypsum has such a role, ah, the original gypsum in the consumption of aerated bricks as a conditioner in the process of gas. It is a commonly used gelling material. Gypsum not only acts as a conditioner in the gas evolution process, but also improves the strength, shrinkage and frost resistance of products by participating in hydrothermal synthesis reaction. The consumption of gypsum in aerated brick mainly includes the following aspects:

　　，參與鋁粉的發氣反響，當有石膏存在時，同鋁粉在與水反響時生成的氫氧化鋁反響生成硫鋁酸鈣。因而，在某些加氣磚(如水泥-礦渣-砂，水泥-砂)中，水泥中石膏被鋁粉的反響耗費過多時，由于水泥中鋁酸鹽成分得不到石膏的抑止就可能發作快速凝結，這時應補充參加石膏。

　　Firstly, it participates in the gas reaction of aluminium powder. When gypsum exists, it reacts with aluminium hydroxide produced by aluminium powder when it reacts with water to form calcium sulphoaluminate. Therefore, in some aerated bricks (such as cement-slag-sand, cement-sand), gypsum in cement is consumed too much time by the reaction of aluminium powder. Because the aluminate component in cement can not be suppressed by gypsum, it may occur rapid condensation. At this time, gypsum should be supplemented.

　　第二，抑止石灰的消化，使其消化時間延長，并降低終消化溫度。

　　Secondly, restrain the digestion of lime, prolong the digestion time and reduce the final digestion temperature.

　　第三，能夠抑止水石榴子石的生成，從而使游離的鋁離子進入CSH(I)中，其中局部轉化為鋁代托勃莫來石，而AI2O3自身也能促進CSH(I)向托勃莫來石轉化，阻止其向硬硅鈣石轉化，因此強度進步，收縮值降低。

　　Thirdly, it can inhibit the formation of hydrogarnet, so that free aluminium ions can enter CSH (I), which is locally converted to Aluminium-substituted Tobra mullite, and AI2O3 itself can also promote the transformation of CSH (I) to Tobra mullite and prevent its transformation to anhydrite, so the strength improves and the shrinkage value decreases.

　　第四，進步坯體及制品的強度，改善收縮等性能。石膏在靜停過程中的坯體內參與生成水化硫鋁酸鈣和C-S-H凝膠，使坯體強度進步。加強了坯體順應蒸壓時溫差應力和濕差應力的才能。在蒸壓過程中，石膏能夠促進水熱反響的停止，使CSH(I)向托勃莫來石轉化。

　　Fourthly, the strength of green bodies and products should be improved, and the shrinkage property should be improved. The gypsum participates in the formation of hydrated calcium sulphoaluminate and C-S-H gel during the static shutdown process, so that the strength of the green body is improved. It strengthens the ability of temperature difference stress and wet difference stress when green body complies with autoclaving. In the autoclave process, gypsum can promote the stop of hydrothermal reaction and make CSH (I) transform to tobermorite.

　　看完上面的敘說您是不是明白了，石膏的作用真的很大，用處也是如此的寬廣。

　　After reading the above narrative, do you understand that the role of gypsum is really great, and its use is so broad.