长江中下游地区沿江一带,分布一些经天然冲洗,含泥量不高,颗粒园整、粒度均匀,砂粒细的江砂。江苏省内不少地方、镇江沿江一带,以及江心州都有此砂,资源极为丰富。对该砂进行了一些初步性能试验,粒度140/270目;颗粒形状为园形和多角形(○ In the area along the Yangtze River in the middle and lower reaches of the Yangtze River, there are some rivers and sands that have been naturally washed, contain a small amount of mud, and have a uniform particle size and uniform sand grains. Many places in Jiangsu Province, areas along the river in Zhenjiang, and Jiangxinzhou have this sand, which is extremely rich in resources. Some preliminary performance tests were performed on the sand with a particle size of 140/270 mesh; the shape of the particles was round and polygonal (○