poor graded 中文意思是什麼
poor graded
解釋
級配不良的-
Open graded friction courses ( ogfc ) is a kind of open graded porous asphalt mix designed to drain water on the road face when raining. it has good performance on draining, anti - slide and noise reducing. it is common used in foreign countries from 1980s, while the lack in china because its poor mechanics performance, due to the high pore rate, cannot fit for the heavy traffic load in china
開級配瀝青磨耗層（ ogfc ）是一種具有相互連通空隙的開級配混合料，具有優良的排水、防滑、降噪等功能，然而該種混合料空隙率達15以上，瀝青用量低，混合料的耐久性和強度會產生一定影響，由於我國高速公路重載、超載嚴重，按國外設計方法設計的ogfc混合料難以滿足路用性能的要求，因此， ogfc在我國高等級公路建設中一直沒有得到推行。
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