علل ترک خوردن گچ کاری
19 اسفند 90 ساعت 05:56 | نوشته ‌شده به دست گچ سمنان | ( نظرات )

گاهی درساختمان ملاحظه می کنیم که سطوحی گچ کاری شده پس از خشک شدن و سخت شدن ترک می خورد و شکل بسیار بدی به محل آن می دهد این ترک خوردگی می تواند به دلایل زیر باشد:

1-اگر در موقع ساختن ملات گچ مقدار گچی را که درآب می ریزیم ازحد معینی کمتر باشد ( درصد وزن آب نسبت به گچ زیاد باشد) بطوریکه گچ نتواند پس از انبساط حجم آب مصرف شده در ملات را پر کند در نتیجه گچ پس از خشک شدن تقلیل حجم داده و می ترکد.

2- اگر کلفتی ملاتی که روی دیوار می کشیم از 8-7 سانتیمتر بیشتر باشد و آنرا در یک نوبت بکشیم لایه های روئی گچ دراثر مجاورت با هوا به فوریت خشک میشوند در حالی که هنوز لایه های درونی مرطوب هستند و اگر این لایه ها هم بخواهند خشک شوند یعنی آب آنها تبخیر شود ناچارا ً باید درسطح گچ کاری ترکهایی ایجاد شود تا امکان خروج بخار آب لایه های زیرین حاصل شود.

3- اگر درفصل سرما و درجات زیر صفر اقدام به گچ کاری بنمائیم و آب ملات گچ قبل از انبساط و سخت شدن گچ یخ بزند فعل و انفعالات شیمیائی برای سخت شدن در ملات متوقف می شود. پس از آنکه یخ ذوب شد گچ فاسد شده و دیگر به انبساط خود ادامه نمی دهد در نتیجه در سطح گچ کاری  شده ترک خوردگی مشاهده می گردد.

4- بعضی از ترکها درگچ کاری بعلل فوق نبوده و در اثر نشستهای ساختمان بوجود می آید، این نوع ترکها معمولا ًبا زاویه 45 درجه نسبت به افق ظاهر می شود.


یکی از جدیدترین محصولات گچ سمنان گچ 33 کیلویی توچال است که به دلیل درصد خلوص بسیار بالا از این امر (ترک خوردن گچ کاری در مرحله آخر(سفیدکاری)) جلوگیری میکند.



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