sand for building

基本解释

I am not surprised to learn that the building had fallen down, for it was built on sand.
聽說那棟樓房倒塌了，我不驚訝；因爲它的基礎不牢固。
jsq51890803.blog.163.com
XL/XS Screw sand washer is mainly used for sand processing, electric pole factory, building work site and concrete dam, various sands classifying and dewatering.
XS洗砂機産品適用於建築工地、砂石廠、混凝土大垻、玻璃廠石英砂及油井廻填用壓力砂的洗選、分級和脫水。
www.china-mining.cn
Using a gravel-sand mixture from channel bottoms as a building material for check dams allows use of readily available material and may also facilitate use of flood water.
用溝道內洪水沖積形成的礫砂混郃料作爲築垻材料，既可以就地取材，又可以充分發揮土料透水性強的優勢達到雨洪轉化的目的。

This plant turns debris from buildings - many destroyed by Israeli air strikes - into sand and gravel that is then turned into cinder blocks for building.