تبلیغات
گچ ، گچبری ، گچ کاری - گچ پزی
گچ گچبری مقاله عکس فیلم

گچ پزی

نویسنده :
تاریخ:1392/01/6-16:44

گچ پزی


گچ پزی یعنی حرارت داردن به سنگ گچ آبدار بطوریکه بتوانیم 5/1 ملکول ازآب تبلور آنرا تبخیر نمائیم. همانطوریکه گفته شد سنگ گچ  سولفات کلسیم بعلاوه در وملکول آب تبلور می باشد. به فرمول 2 H2O،  Caso4 عمل تبخیر 5/1 ملکول اب تبلور سنگ گچ در گرمای بسیار کم انجام می شود، بطور یکه اگر به سنگ گچ درحدود 170 درجه حرارت بدهیم 5/1 ملکول از آب تبلور خود را از دست داده و به گچ ساختمانی به فرمول 2 H2O،Caso4  تبدیل می گردد و دراثر حرارت بیشتر تا گرمای 300 درجه سنگ گچ 7/1 ملکول آب تبلور خود را از دست داده و به گچ تشنه به فرمول 2 H2O،Caso4 تبدیل می شود. این گچ میل ترکیبی شدید با آب داشته بطوریکه اگر در مجاور هوای آزاد قرار بگیرد 2/0 ملکول آب از بخار

موجود درهوارا جذب کرده به گچ ساختمانی با 5/0 ملکول آب تبلور تبدیل میشود. درگرمای 700 درجه سنگ گچ کلیه آب تبلور خود را از دست داده وبه سولفات کلسیم به فرمولCaso4 تبدیل می گردد که به آن گچ سوخته می گویند. این محصول میل ترکیب با آن را نداشته و قابل مصرف درصنایع ساختمانی نیست. البته می توان با افزودن بعضی مواد به آن مانند: زاج و یا سولفات روی Znso4 میل ترکیبی آنرا ب اآب عودت داد ولی درصنایع ساختمانی این کار مقرون به صرف نیست. گچی که تمام آب تبلور خود رااز دست بدهد انیدریت نام دارد. گچ

از گرمای 700 تا 1400 درجه گچ سوخته تجزیه شد هو به اکسید کلسیم به فرمول CaO و گازSo3 تبدیل می گردد. و So3 به So2 تبدیل گشته که هر دو متصاعد میگردند و اگر CaO که همان آهک زنده باشد در پودر گچ باقی بماند درزمان گیرائی آن تاثیر گذاشته و در اثر مجاورت با آب شکفته شده و به هیدرات کلسیم Ca(OH)2 تبدیل می گردد. و اگر ازاین گچ برای سفید کاری استفاده شود دانه های آهکی درمجاورت آب ازدیاد حجم پیدا کرده و در سطح گچ کاری شده ایجاد ناصافی مینماید و آنرا آبله رو می کند که در اصطلاح کارگاهی به آن الوئک می گویند.



نوع مطلب : مقالات گچ 

Buy cialis
1397/09/15 23:53

Thank you. Great information.
purchasing cialis on the internet cialis italia gratis cialis prezzo al pubblico cialis official site buy online cialis 5mg online prescriptions cialis opinioni cialis generico cialis for daily use costo in farmacia cialis cialis 5 effetti collaterali
buy cialis online safely
1397/09/15 04:24

Fine posts. Appreciate it!
cialis diario compra we like it safe cheap cialis cialis online deutschland where do you buy cialis prices on cialis 10 mg tesco price cialis click here to buy cialis low dose cialis blood pressure how does cialis work buy cialis uk no prescription
Cialis canada
1397/09/14 10:48

Fantastic information. Kudos!
cialis canada on line cialis prices 5 mg cialis pharmacie en ligne cialis 100mg suppliers cialis 20mg prix en pharmacie generic cialis 20mg tablets effetti del cialis cialis price thailand purchasing cialis on the internet cialis generika
buy cials online
1397/09/13 23:21

Appreciate it! An abundance of content.

cialis sale online comprar cialis navarr opinioni cialis generico cialis in sconto where to buy cialis in ontario cialis with 2 days delivery canadian cialis opinioni cialis generico enter site very cheap cialis generic cialis levitra
buy cialis uk
1397/09/13 12:24

Whoa a good deal of useful information!
buy cialis online nz chinese cialis 50 mg buy cialis uk no prescription cialis 5 mg scheda tecnica safe site to buy cialis online cialis prezzo in linea basso cialis super kamagra generico cialis mexico buy cialis online cialis bula
buy tadalafil online
1397/09/12 11:52

You reported that perfectly.
cipla cialis online how do cialis pills work bulk cialis 5 mg cialis coupon printable cialis 5 effetti collaterali cialis online we use it 50 mg cialis dose only here cialis pills low cost cialis 20mg cialis super kamagra
Buy cialis
1397/09/12 00:30

You've made your point!
cialis para que sirve trusted tabled cialis softabs pastillas cialis y alcoho achat cialis en itali cialis generika in deutschland kaufen cialis price thailand cialis side effects dangers weblink price cialis sublingual cialis online cialis cost
buy tadalafil
1397/09/11 11:19

Great facts. Thank you!
cialis 20 mg cut in half sialis cialis ahumada cialis italia gratis cialis generico in farmacia acheter cialis meilleur pri bulk cialis usa cialis online cialis lilly tadalafi cialis prezzo al pubblico
Cialis generic
1397/09/11 00:27

Nicely put. Thank you!
dosagem ideal cialis buy brand cialis cheap cialis patentablauf in deutschland cialis vs viagra cialis pills price each we like it safe cheap cialis cialis price in bangalore viagra cialis levitra price cialis wal mart pharmacy cialis lilly tadalafi
Buy generic cialis
1397/09/10 11:12

You said it nicely..
cialis kamagra levitra cialis daily dose generic cialis lowest price cialis coupons printable tesco price cialis cialis kamagra levitra can i take cialis and ecstasy prix cialis once a da cialis 5mg cialis farmacias guadalajara
buy cheap cialis on line
1397/09/9 23:57

Awesome posts. Kudos.
cialis pas cher paris cialis sans ordonnance look here cialis order on line cialis daily look here cialis cheap canada dosagem ideal cialis viagra vs cialis online cialis enter site natural cialis cialis dose 30mg
Buy generic cialis
1397/09/9 12:21

You mentioned that terrifically!
achat cialis en europe cialis 20mg preis cf sublingual cialis online estudios de cialis genricos cialis taglich cialis 30 day sample cialis 5 mg funziona generic cialis pro we recommend cialis info price cialis per pill
buy cialis germany
1397/09/9 00:52

Wow lots of superb information.
generic cialis tadalafil cialis online holland weblink price cialis wow cialis 20 cialis uk next day cialis tadalafil cialis preise schweiz click now cialis from canada cialis patentablauf in deutschland venta de cialis canada
buy cheap cialis no prescription
1397/09/8 13:30

You made your point quite nicely!.
cialis kamagra levitra cialis authentique suisse buy cialis uk no prescription generic cialis 20mg tablets cialis 100mg suppliers dosagem ideal cialis prezzo cialis a buon mercato we recommend cialis info overnight cialis tadalafil pastillas cialis y alcoho
Cialis generic
1397/09/8 01:09

Thank you! Loads of data.

generic cialis levitra cialis uk next day online prescriptions cialis i recommend cialis generico cost of cialis per pill cialis cuantos mg hay how does cialis work 5 mg cialis coupon printable wow cialis 20 cialis 200 dollar savings card
buy tadalafil pills
1397/09/7 12:46

Nicely put, Thanks.
online cialis generic cialis soft gels only best offers 100mg cialis tadalafil 5mg cialis coupon cialis online prices on cialis 10 mg cialis 5 mg effetti collateral we choice cialis uk costo in farmacia cialis
Cialis canada
1397/09/7 00:44

You actually reported this adequately!
cialis taglich buying brand cialis online buy cialis online click here to buy cialis how does cialis work cialis 5mg prix generic cialis at the pharmacy generic cialis levitra prices for cialis 50mg cialis super acti
generic levitra
1397/07/19 01:36

Terrific postings. Cheers!
buy levitra generic levitra 20 mg bayer prezzo vardenafil buy levitra online levitra prices levitra 10 mg prezzo levitra 10 mg kopen levitra 20 mg bayer prezzo buy 10 mg levitra levitra without a doctor prescription
buy cialis without a doctor's prescription
1397/07/10 01:26

Seriously plenty of wonderful facts!
interactions for cialis cialis farmacias guadalajara cost of cialis cvs only best offers cialis use cialis super acti acquisto online cialis cialis tadalafil online only best offers 100mg cialis we choice cialis pfizer india cialis 20 mg effectiveness
buy cialis online cheap
1397/07/7 23:22

With thanks! Awesome stuff!
generic for cialis cialis rezeptfrei sterreich cialis 20mg preis cf canadian drugs generic cialis costo in farmacia cialis cialis cipla best buy ou acheter du cialis pas cher comprar cialis navarr chinese cialis 50 mg cialis online napol
cialisonli.com
1397/07/7 19:55

You actually stated it exceptionally well.
buy cialis cialis prezzo al pubblico cialis 20 mg effectiveness cialis 05 cialis for sale in europa how much does a cialis cost cialis farmacias guadalajara cialis soft tabs for sale cialis for sale south africa recommended site cialis kanada
canadian pharmaceuticals companies
1397/06/31 14:42

Cheers, I like it!
trust pharmacy canadian online pharmacies in usa canadian pharmacies that ship to us online canadian discount pharmacies canada online pharmacy northwest pharmacies in canada buy viagra 25mg buy viagra online usa aarp recommended canadian pharmacies online pharmacies legitimate
http://cialisvbuy.com/
1397/06/28 16:41

You suggested it perfectly!
cialis 100 mg 30 tablet cialis uk next day opinioni cialis generico we choice free trial of cialis comprar cialis navarr acheter cialis meilleur pri canada discount drugs cialis order cialis from india cialis usa cost cialis manufacturer coupon
viagrayosale.com
1397/06/27 13:34

You expressed it exceptionally well.
cialis per paypa discount cialis link for you cialis price buying cialis on internet cialis en 24 hora tadalafilo click now buy cialis brand only best offers cialis use look here cialis cheap canada try it no rx cialis
viagraessale.com
1397/06/15 01:15

You said it nicely..
cialis alternative ou trouver cialis sur le net cialis 5 mg schweiz acheter cialis kamagra cialis 20 mg cut in half interactions for cialis price cialis best cialis lilly tadalafi buy generic cialis prices on cialis 10 mg
canadianpharmacytousa.com
1397/06/13 17:24

Cheers. Plenty of facts.

best canadian mail order pharmacies online pharmacy canadian pharmaceuticals online canada rx canada drug pharmacy canadian drugstore canadian government approved pharmacies pharmacy online pharmacies of canada aarp recommended canadian online pharmacies
viabiovit.com
1397/06/13 02:39

Valuable tips. Appreciate it.
cost of viagra buy viagra sample viagra online with prescription buy viagra legally viagra generic levitra online pharmacy viagra how can i buy viagra online buy viagra pfizer buy real viagra online cheap viagra viagra from pharmacy
cialissv.com
1397/06/12 00:36

You said it perfectly..
cialis generico lilly venta de cialis canada cialis for sale walgreens price for cialis try it no rx cialis wow look it cialis mexico best generic drugs cialis cialis daily cialis generico milano cialis from canada
http://cialisbuys.com/
1397/06/11 11:47

Thanks a lot! I appreciate it.
how to buy cialis online usa price cialis per pill buying brand cialis online cialis generic cialis daily new zealand tadalafilo online prescriptions cialis canadian discount cialis prix de cialis generic cialis review uk
viabiovit.com/viagra-bestellen-erfahrungen.html
1397/05/23 02:42

Regards. Quite a lot of material!

ordering viagra online uk viagra buy viagra soft online order viagra buying viagra buy cheap viagra online uk viagra uk buy online where to buy viagra from online pharmacy viagra generic buy generic viagra online cheap
 
لبخندناراحتچشمک
نیشخندبغلسوال
قلبخجالتزبان
ماچتعجبعصبانی
عینکشیطانگریه
خندهقهقههخداحافظ
سبزقهرهورا
دستگلتفکر


نمایش نظرات 1 تا 30