涩老板在线免费视频_午夜成人精品_神马理论午夜,,_亚洲有薄码区久久欧美精品一区_97人人色_神马在线精品_成人熟女一区二区_亚洲二区三区四区_人妻午夜免费_大鸡巴猛男爆操骚逼国产一区二区_丁香婷婷久久一区二区三区_岛国内射美女_亚洲一级电影,亚洲欧美日韩国产最新版,亚洲五月综合缴情综合久久本,少妇色情喷水又紧又爽小说,巜上司的少妇的滋味,国产精品三级女人国产香蕉,亚洲最好的免费电影,欧美亚洲国产成人精品,国产永久一区二区三区,亚洲综合一区无码精品,歳の熟女セックス,内射带小孩熟妇,果冻传媒在线看免费视频观看,成人欧美一区二区三区片,亚洲 片内射欧美美妇,一本无码人妻在中文字幕免费,亚洲无毛视频,中文字幕丰满孑伦无码专区,亚洲爆乳无码专区色戒纶理,肉乳床欢无码片动漫软件,欧美日韩一区二区另类,久热只有精品在线直播,精品亚洲一区二区在线播放,精品国产乱码久久久久久影片,国产一级高清在线观看,国产精品福利在线一区,成人动漫下载,乱伦性爱视频,xo无码AV毛,国产黄A片免费网站免费,日韩欧美一级特黄特色大片

Ventilation ducts are mostly thin-walled and large painted products, which often experience warping and deformation issues during production and use. The main reasons are as follows: four points:

(1)鎂水泥的體積是在自然固化條件下的連續(xù)膨脹過程。線膨脹率為0.1-0.2%，體積膨脹率約為1%。

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

(2)在服務(wù)燃燒過程中不可避免地發(fā)生菱鎂礦的局部過燒，導(dǎo)致部分MgO處于死燃狀態(tài)。過度燃燒的MgO的水合過程非常緩慢。當(dāng)具有強度的水泥石中的MgO再次被水水合時，形成Mg(OH)2，并且體積膨脹為120%。

(2) In the process of service combustion, local overburning of magnesite inevitably occurs, resulting in some MgO being in a dead burning state. The hydration process of excessively burned MgO is very slow. When MgO in high-strength cement paste is hydrated again by water, it forms Mg (OH) 2 and has a volume expansion of 120%.

(3)輕度燃燒氧化鎂中游離CaO的體積在水化過程中增加了90%，而SO42-存在于鹽水片中。當(dāng)Ca(OH)2轉(zhuǎn)化為石膏時，固體體積將增加兩倍以上，導(dǎo)致產(chǎn)品變形。這也是限制輕微燃燒的氧化鎂和鹽水薄片中的SO42-中游離CaO含量的原因。

(3) The volume of free CaO in lightly burned magnesium oxide increased by 90% during the hydration process, while SO42- was present in saline solution. When Ca (OH) 2 is converted into gypsum, the solid volume will increase by more than twice, leading to product deformation. This is also the reason for limiting the free CaO content in SO42- in slightly burned magnesium oxide and salt water flakes.

(4)MgO-Mg-C12-H2O體系的水化過程是一個強烈的放熱反應(yīng)過程，生產(chǎn)管道的體積很大。如果環(huán)境溫度高，則反應(yīng)溫度升高。片材的整體溫度太高并且反應(yīng)不充分，導(dǎo)致更大的結(jié)晶應(yīng)力和熱膨脹應(yīng)力，以及產(chǎn)品的體積膨脹。

(4) The hydration process of the MgO-Mg-C12-H2O system is a strong exothermic reaction process, and the volume of the production pipeline is large. If the ambient temperature is high, the reaction temperature increases. The overall temperature of the sheet material is too high and the reaction is not sufficient, resulting in greater crystallization stress and thermal expansion stress, as well as volume expansion of the product.

本文由濟(jì)南通風(fēng)管道為您提供，我們的網(wǎng)站是:http://www.okok0579.com  我們將以全心全意的熱情為您提供服務(wù)，歡迎您的訪問！

This article is provided by Jinan Ventilation Pipeline, and our website is: http://www.okok0579.com We will provide you with wholehearted enthusiasm and welcome your visit!