آزمایش درجه نفوذ قیر
آزمایش درجه نفوذ قیر برای تعیین سختی نسبی قیرهای دمیده و قیرهای خالص استفاده می شود. یکی از کاربردهای درجه نفوذ در نامگذاری قیرهای خالص و قیرهای دمیده است.
قیرهای خالص تنها بر این اساس نامگذاری می شوند اما معیار نامگذاری قیرهای دمیده علاوه بر درجه نفوذ قیر ، درجه نرمی قیر نیز می باشد. به عنوان نمونه ، قیرهای ۴۰-۵۰ ، ۶۰-۷۰ ، ۸۵-۱۰۰ و … از جمله قیرهای خالص معمول در راهسازی می باشند.
دو عددی که همراه قیر خالص می آید بیانگر آن است که درجه نفوذ قیر در این محدوده قرار دارد. قیرهای R85/25 ،R90/15 ، R110/10 و … نمونه هایی از قیرهای دمیده متداول در ایران است که عدد اول آن بیانگر درجه نفوذ قیر و عدد دوم بیانگر نقطه نرمی قیر است.
بر حسب تعریف، درجه نفوذ قیر عبارت است از مقدار طولی ( بر حسب میلیمتر ) است که یک سوزن استاندارد با شکل معین تحت اثر باری معادل ۱۰۰ گرم در مدت ۵ ثانیه در قیری که در درجه حرارت ۲۵ درجه سانتیگراد است ، نفوذ نماید.
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