There are four key reasons for the deformation of ventilation ducts:

1.在自然養(yǎng)護(hù)標(biāo)準(zhǔn)下，鎂混凝土體積為連續(xù)膨脹過(guò)程，線膨脹率為0.1-0.2%，體積含水率為1%左右。

Under natural curing standards, the volume of magnesium concrete undergoes a continuous expansion process, with a linear expansion rate of 0.1-0.2% and a volume moisture content of about 1%.

2.燃燒過(guò)程中很難避開(kāi)磁鐵礦，安裝在3C認(rèn)證防火閥中的粗晶MgO水化過(guò)程緩慢。已產(chǎn)生抗壓強(qiáng)度的粉煤灰水泥中的MgO再次遇水并水化時(shí)，轉(zhuǎn)化為Mg(OH)2，體積增加120%。

2. It is difficult to avoid magnetite during the combustion process, and the hydration process of coarse-grained MgO installed in 3C certified fire dampers is slow. When MgO in fly ash cement that has developed compressive strength encounters water again and hydrates, it is converted into Mg (OH) 2, resulting in a volume increase of 120%.

3.水合后輕燒氧化鎂中分散CaO的體積增加90%，而鹵素片中存在SO42-。當(dāng)Ca(OH)2轉(zhuǎn)化為成熟石膏時(shí)，固態(tài)體積會(huì)增加2倍以上，導(dǎo)致產(chǎn)物變形，這也是限制輕燒氧化鎂中分散CaO和鹵素片中SO42-含量的原因。

3. After hydration, the volume of dispersed CaO in lightly burned magnesium oxide increases by 90%, while SO42- is present in halogen flakes. When Ca (OH) 2 is converted into mature gypsum, the solid volume will increase by more than twice, leading to product deformation, which is also the reason for limiting the content of dispersed CaO and SO42- in halogen flakes in light burned magnesium oxide.

通風(fēng)管道

Ventilation ducts

4.MgO-Mg-C12-H2O體系軟件的水化過(guò)程是一個(gè)明顯的化學(xué)反應(yīng)過(guò)程，制造的管道體積較大。如果工作溫度高，反映的是升溫過(guò)程，板材本身過(guò)高，反映不夠，導(dǎo)致晶體地應(yīng)力和熱變形地應(yīng)力大，使產(chǎn)品體積膨脹。

The hydration process of MgO-Mg-C12-H2O system software is an obvious chemical reaction process, and the manufactured pipeline volume is relatively large. If the working temperature is high, it reflects the heating process. If the plate itself is too high, it will not reflect enough, resulting in high crystal stress and thermal deformation stress, causing product volume expansion.