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بتنریزی در هوای سرد با یک مشکل مواجه است و آن هم گیرش دیر سیماناست. وقتی سیمان سفت نشود، آب درون آن یخ زده و پس از ذوب شدن، دیگر با سیمان واکنش نمیدهد و تبخیر میشود. اگر بتن مقاوم باشد و در اثر این سیکل ذوب و یخبندان متلاشی نشود، در بتن حفرههای بزرگ هوا به وجود میآید و مقاومت بتن در اثر این حفرهها به شدت کاهش داده میشود. اگر این آب به سرعت و...
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