泵送混凝土原材料的需求量和质量要求越来越高，同时其生产和运输过程中产生的建筑垃圾、碳排放等环境污染问题也日益凸显。目前，河砂、卵石等天然原材料供不应求；以石灰石为原料生产的碎石和机制砂的质量和产量不断提高，但仍有提升空间；老旧淤塞河道中开采的河砂、使用大粒径天然卵石为原料生产的碎卵石和机制砂，其市场认可度尚待提高；水泥、粉煤灰、粒化高炉矿渣粉等原材料在企业转型升级的同时也带来了平原、丘陵、山地等区域的整体供应分布不均问题；聚羧酸型外加剂以其高效、经济、方便等优点普及市场，还可进一步提升与砂石的适应性。

The demand and quality requirements of raw materials about pumping concrete are getting higher and higher, and the environmental pollution problems such as construction waste and carbon emissions generated in the process of production and transportation are also becoming increasingly prominent. At present, natural raw materials such as river sand and pebbles are in short supply in some areas. The quality and yield of crushed stone and machine-made sand produced from limestone have been improving continuously, but there is still considerable room for improvement. The market recognition of river sand mined from old silted river channels, gravel and machine-made sand produced from natural pebbles with large particle size needs to be improved. Cement, fly ash and granulated blast furnace slag powder bring about uneven distribution of the overall supply in plains, hills and mountains regions during the transformation and upgrading of enterprises. Polycarboxylic acid admixture is popularized in the market due to its advantages of high efficiency, economy and convenience, and can further improve its adaptability to sand and gravel.

TU521.1

国家“十三五”重点研发计划项目（2017YFB0310105）