在长江中上游及我国的其它一些地区有丰富的细砂、特细砂资源 ,如本地区 (三峡地区 )的砂细度模数一般都小于 2 .2 ,且级配不好。鉴于细砂混凝土在工程中应用非常普遍 ,因此做好细砂混凝土的应用 ,对于充分利用当地资源、保证工程质量 ,具有重要而实际的意义。细砂与中粗砂相比 In the middle and upper reaches of the Yangtze River and other parts of our country are rich in fine sand, extra fine sand resources, such as the region (the Three Gorges region) sand fineness modulus is generally less than 2.2, and the grading is not good. In view of fine sand concrete is very common in engineering application, so fine sand concrete application, for the full use of local resources, ensure project quality, has important and practical significance. Fine sand and coarse sand compared