亚洲精品鲁一鲁一区二区三区-最爽无遮挡行房视频-强壮的公次次弄得我高潮A片日本-精品人妻无码一区二区三区换脸-中文字幕亚韩-亚洲国产精品一区二区第一页-丰满岳乱妇一区二区三区-大陆极品少妇内射AAAAAA-国产乱人伦AV麻豆网-AV国産精品毛片一区二区三区-午夜精品视频在线无码-免费精品一区二区三区A片在线-在线天堂无限次观看,亚洲日韩无码一区二区,中文字幕乱人伦视频在线,亚洲欧美熟妇综合久久久久久,少妇无码一区二区三区免费久久,欧美黑人一级片在线观看,久久久精品无码一区三区,国产视频在线观看蜜芽,大香蕉五月婷婷精品视频 ,久草精品在线,国产无码在线播放一区二区,囯产无码交换大片在线播放,八戒八戒在线高清观看视频 ,娇妻被又粗又长又猛玩,国产曰肥老太婆无遮挡,国产剧情黄色,国产成年无码久久久久毛片資訊,大香蕉太香蕉成人现现,逼逼爱爱爱无码免费观看,亚州色图欧美图片自偷自拍,碰碰视频麻豆,午夜一本,一起射综合影院,黑人干熟女,欧洲高清转码区一二区 ,国产高清视频色拍,粉嫩无码小泬无套在线观看,大香蕉在线网站,成人做爰理论片,成人漫,9l视频自拍九色9l成人

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.wxcdx.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.wxcdx.com We will provide you with wholehearted enthusiasm and welcome your visit!