級(jí)配砂石和級(jí)配碎石主要區(qū)別在于其中的集料。

The main difference between graded sand and gravel and graded crushed stone lies in the aggregate used.

1、級(jí)配砂石的主要用途：

1. The main uses of graded sand and gravel are:

人工級(jí)配是配合比是礫石（20mm-40mm）：天然砂：水=9.11:4.97:3

Artificial grading is a mix ratio of gravel (20mm-40mm): natural sand: water=9.11:4.97:3

級(jí)配碎石墊層應(yīng)密實(shí)穩(wěn)定，其粒徑級(jí)配范圍滿足下表：

The graded crushed stone cushion layer should be dense and stable, and its particle size grading range should meet the following table:

以上兩種級(jí)配均為墊層級(jí)配。

The above two gradations are both cushion gradations.

種規(guī)定了所有顆粒直徑均不能大于50mm，為了更好滿足壓實(shí)度，推薦選用種！另外為了防止凍脹和濕軟，應(yīng)注意控制小于0.5mm細(xì)料的含量和塑性指數(shù)。在中濕和潮濕路段，用做瀝青路面的墊層時(shí)，應(yīng)在級(jí)配中加石灰，細(xì)料可適當(dāng)增加，加入的石灰劑量占細(xì)料含量的8%--12%.目的在于增加墊層強(qiáng)度和穩(wěn)定性。

According to the regulations, the diameter of all particles cannot exceed 50mm. In order to better meet the compaction requirements, it is recommended to choose Zhong! In addition, to prevent frost heave and moisture softening, attention should be paid to controlling the content and plasticity index of fine materials less than 0.5mm. When used as a cushion layer for asphalt pavement in medium and humid road sections, lime should be added to the gradation, and the amount of fine material can be appropriately increased. The amount of lime added accounts for 8% -12% of the fine material content The purpose is to increase the strength and stability of the cushion layer.

級(jí)配礫石有時(shí)候用來做墊層叫做級(jí)配砂礫墊層，其級(jí)配砂礫要求顆粒尺寸在5--40mm之間，其中25--40mm含量不少于50%。

Graded gravel is sometimes used as a cushion layer called graded gravel cushion layer, and its graded gravel requires a particle size between 5-40mm, with 25-40mm accounting for no less than 50%.

2、級(jí)配碎石的主要用途：

2. The main uses of graded crushed stone are:

（1）級(jí)配型集料可以用做瀝青路面和水泥混凝土路面的基層和底基層，也可用做路基改善層。在排水良好的前提下，級(jí)配型集料可在不同氣候區(qū)用于不同交通等級(jí)的道路上。在潮濕多雨地區(qū)使用級(jí)配型集料非常有利。

(1) Graded aggregate can be used as the base and subbase of asphalt pavement and cement concrete pavement, as well as as as the subgrade improvement layer. Under the premise of good drainage, graded aggregates can be used on roads of different traffic levels in different climate zones. The use of graded aggregates is particularly advantageous in humid and rainy areas.

（2）級(jí)配型集料用做路面的不同層次或用于路面中的不同位置，取決于材料本身的特性、材料的質(zhì)量、氣候條件、交通組成和交通量及每個(gè)、每個(gè)地區(qū)的使用經(jīng)驗(yàn)。

(2) Graded aggregate is used for different levels of pavement or at different locations in the pavement, depending on the characteristics of the material itself, the quality of the material, climatic conditions, traffic composition and volume, as well as the usage experience of each region.