中粗砂中一般含有1%～3%的大粒径砂头。当工程竣工后,这些砂头多被抛弃,既是一种浪费,又影响环境卫生。可对粗砂头进行处理,代替常用的白石子,做成粗砂头水磨石面层,能降低造价20%。具体作法如下。1.粗砂头处理(1)将粗砂头用水淘洗并晾干。不可有泥团或其它杂质。 Medium coarse sand generally contains 1% to 3% of large particle size sand heads. When the project is completed, these sandpits are often thrown away, which is both a waste and environmental sanitation. The coarse sand can be processed instead of the commonly used white stone to make a coarse sand terrazzo surface, which can reduce the cost by 20%. The specific practices are as follows. 1. Coarse sand treatment (1) The coarse sand head is washed with water and dried. Do not have mud or other impurities.