瀝青混凝土（簡(jiǎn)稱“瀝青砼”）的型號(hào)，字母后面的數(shù)字代表非常大公稱粒徑。選錯(cuò)型號(hào)，路面必出問題。

The model of asphalt concrete (referred to as "asphalt concrete"), with the number after the letter representing the maximum nominal particle size. Choosing the wrong model will inevitably cause problems on the road surface.

AC-13——大粒徑13.2mm，細(xì)粒式。用于上面層（磨耗層），要求抗滑、防水。SBS改性瀝青是標(biāo)配。

AC-13- maximum particle size 13.2mm, fine particle type. Used for the upper layer (wear layer), requiring anti slip and waterproof properties. SBS modified asphalt is standard.

AC-20——粒徑19mm，中粒式。用于中面層，承上啟下，抗車轍。AC-20C改性瀝青混凝土中面層施工，優(yōu)選SBS改性瀝青+石灰?guī)r集料。

AC-20- Maximum particle size 19mm, medium particle type. Used for the middle layer, connecting the upper and lower layers, and resisting rutting. Construction of AC-20C modified asphalt concrete surface layer, preferably SBS modified asphalt+limestone aggregate.

AC-25——大粒徑26.5mm，粗粒式。用于下面層，承重骨架。

AC-25- Maximum particle size of 26.5mm, coarse particle type. Used for the lower layer, load-bearing skeleton.

層位匹配的鐵律： 上面層用細(xì)料（AC-13），下面層用粗料（AC-25），不能顛倒。上面層用粗料——孔隙大、漏水；下面層用細(xì)料——承載力不夠。

The iron rule of layer matching: fine material (AC-13) is used for the upper layer, and coarse material (AC-25) is used for the lower layer, which cannot be reversed. The upper layer uses coarse materials - with large pores and water leakage; The lower layer uses fine materials - the bearing capacity is insufficient.

AC-20C施工關(guān)鍵： 拌和溫度、時(shí)間、均勻性嚴(yán)格控制。運(yùn)輸全程保溫覆蓋。攤鋪勻速，突出分層，建立溫度、厚度、壓實(shí)度實(shí)時(shí)監(jiān)測(cè)體系。AC-13C、AC-20C空隙率均控制在6%以下。

AC-20C construction key: strict control of mixing temperature, time, and uniformity. Insulate and cover the entire transportation process. Spread at a uniform speed, roll in layers, and establish a real-time monitoring system for temperature, thickness, and compaction degree. The porosity of AC-13C and AC-20C is controlled below 6%.

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