沥青混凝土（简称“沥青砼”）的型号，字母后面的数字代表非常大公称粒径。选错型号，路面必出问题。

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——大粒径13.2mm，细粒式。用于上面层（磨耗层），要求抗滑、防水。SBS改性沥青是标配。

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——粒径19mm，中粒式。用于中面层，承上启下，抗车辙。AC-20C改性沥青混凝土中面层施工，优选SBS改性沥青+石灰岩集料。

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——大粒径26.5mm，粗粒式。用于下面层，承重骨架。

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

层位匹配的铁律： 上面层用细料（AC-13），下面层用粗料（AC-25），不能颠倒。上面层用粗料——孔隙大、漏水；下面层用细料——承载力不够。

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施工关键： 拌和温度、时间、均匀性严格控制。运输全程保温覆盖。摊铺匀速，突出分层，建立温度、厚度、压实度实时监测体系。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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