在一些地方，混凝土搅拌站将河砂、江砂、机制砂或淡化海砂等不同砂类混合后使用的情况并不烧碱，这是建筑用砂供应紧张的情况下较为普遍的现象。一旦在砂石的质量控制上存在疏忽，那后期建筑的使用将有很大的隐患。

In some places, concrete mixing plants do not use caustic soda when mixing different types of sand such as river sand, river sand, machine-made sand, or desalinated sea sand, which is a common phenomenon in situations where the supply of construction sand is tight. Once there is negligence in the quality control of sand and gravel, there will be significant safety hazards in the later use of buildings.

那么，原料进场后，要如何通过目测的方式来检查砂石的质量呢？

So, how do we visually inspect the quality of sand and gravel after the raw materials enter the site?

初步判断砂石质量的好坏，主要通过“看、捏、搓、抛”的方法。

The preliminary judgment of the quality of sand and gravel mainly relies on the methods of "looking, pinching, rubbing, and throwing".

1、看：抓一把砂摊在手心，细看粗细砂粒的均匀程度，各级颗粒级配分布越均匀的质量越好；

1. Look: Take a handful of sand and spread it in the palm of your hand. Pay close attention to the uniformity of the coarse and fine sand particles. The more uniform the particle size distribution at all levels, the better the quality;

2、捏：砂的含水率高低可以通过手捏，捏后看砂团的松紧程度，砂团越紧则证明含水率越高，反之越低；

2. Pinching: The moisture content of sand can be determined by hand pinching. After pinching, the tightness of the sand mass can be observed. The tighter the sand mass, the higher the moisture content, and vice versa;

3、搓：抓一把砂在手心，用两手掌搓后轻轻拍手，看手上粘附的泥层多少，泥层越多且黄则证明砂含泥较多，反之则含泥低；

3. Rubbing: Grab a handful of sand in the palm of your hand, rub it with both palms, and gently clap your hands to see how many mud layers adhere to your hands. The more mud layers are yellow and yellow, the more mud the sand contains. Conversely, the lower the mud content;

4、抛：捏过的砂在手里抛一抛，若砂团不松散，可以判定出砂细、含泥且含水较多。

4. Throwing: Throw the pinched sand in your hand. If the sand clump is not loose, it can be determined that the sand is fine, contains mud, and contains more water.