1. Under natural curing conditions, the volume of magnesium cement is a continuous expansion process, with linear expansion rate of 0.1-0.2% and volume expansion rate of about 1%.

2、菱鎂礦在服燒過程中不可避免地產(chǎn)生局部過燒，使一部分MgO呈死燒狀態(tài)，過燒的MgO水化過程很慢，當(dāng)已形成強度的水泥石中的MgO再遇水進(jìn)行水化時，生成Mg(OH)2，體積膨脹120%。

2. During the service burning process of magnesite, it is inevitable to produce local overburning, resulting in a part of MgO in a dead burning state. The hydration process of overburned MgO is very slow. When the MgO in the cement stone with formed strength is hydrated again with water, Mg (OH) 2 is generated, with a volume expansion of 120%.

3、輕燒氧化鎂中游離CaO水化時體積膨脹90%，而鹵片中存在著 SO42-，當(dāng)Ca(OH)2轉(zhuǎn)化成石膏時，固體體積將增加2倍以上，導(dǎo)致制品變形，這也是限制輕燒氧化鎂中游離CaO含量、鹵片中SO42-含量的原因。

3. The volume of free CaO in lightly burned magnesia expands by 90% during hydration, while there is SO42 - in halogen tablets. When Ca (OH) 2 is converted into gypsum, the solid volume will increase by more than twice, resulting in product deformation, which is also the reason for limiting the content of free CaO in lightly burned magnesia and the content of SO42 - in halogen tablets.

4、MgO-Mg-C12-H2O系統(tǒng)水化過程是一個強烈的放熱反應(yīng)過程，而生產(chǎn)的管道體積又大，若環(huán)境溫度較高，則反應(yīng)升溫過程，板材本體溫度過高，反應(yīng)不充分，造成較大的結(jié)晶應(yīng)力和熱膨脹應(yīng)力，使制品體積膨脹。

4. The hydration process of mgo-mg-c12-h2o system is a strong exothermic reaction process, and the volume of the produced pipeline is large. If the ambient temperature is high, the reaction temperature will rise. The plate body temperature is too high and the reaction is insufficient, resulting in large crystallization stress and thermal expansion stress, resulting in the volume expansion of the product.

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