本文研究了C50特细砂泵送混凝土的配制和主要技术性能，并成功应用于工程，取得了良好经济效益。该成果突破了国内外高强系送混凝土均须用中砂配制的规定，对广大特细砂产区推广应用有重要参考价值。 This paper studied the preparation and main technical performance of C50 extra fine sand pumping concrete, and it was successfully applied to the project and achieved good economic benefits. This achievement breaks through the regulations that high-strength systems for sending concrete at home and abroad must be formulated with medium sand, and has important reference value for the popularization and application of large-scale special sand production areas.