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,久久久久亚洲精品,欧美日韩性生活片,麻豆天美精东蜜桃传,韩日一级黄色片,高辣文黄暴糙汉文文,亚州一射区,狠狠综合久久综合88亚洲,免费看污又色又爽又黄的小说,在线久色,无码一区二区三区蜜桃大,三级大片,免费无码又爽又刺激片涩涩直播,久艾草久久综合精品无码国,国产色情无码永久免费软件,肥伴老妇水多乳大小说,久久国产色情爽翻爽翻,怡春院在线视频,国产精品久久久爽爽爽麻豆色哟哟 ,久久久WWW成人免费精品,在线观看私密高清无码,亚洲午夜无码伦在线观看,亚洲毛片,五月天国产成人在线,天美精品国产自产在线,色熟妇人妻久久中文字幕,日韩精品无码久久久久成人,日本欧美在线高清,人妻在卧室被老板疯狂进入国产,人妖欧美一区二区三区四区,日本免费理论片

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(qiáng)度的水泥石中的MgO再次被水水合時(shí)，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(shí)，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(gè)強(qiáng)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.gaoyouwenhua.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.gaoyouwenhua.com We will provide you with wholehearted enthusiasm and welcome your visit!