乌东德特高拱坝混凝土砂石骨料生产质量改进措施研究

Measures Improving Quality of Concrete Aggregate Production for Wudongde Ultra-high Arch Dam

砂石骨料质量的优劣是混凝土质量的基础,对大坝的长期安全稳定运行具有重要意义。结合乌东德大坝砂石加工系统生产工艺特点,对料场毛料开采、砂石骨料加工全过程进行全面的梳理和质量改进措施研究,提出了粗、细骨料生产工艺的优化改进措施。结果表明,砂石骨料生产工艺的改善有效控制了粗骨料粒型,提升了成品砂的产量和质量(细度模数、石粉及微粒含量),确保了乌东德大坝混凝土品质,保障了大坝工程全生命周期的质量和安全。研究结果为类似水电工程人工骨料品质改善提供了参考。

Quality of artificial aggregate is the foundation of concrete quality,which is of great significance to the safety and stability of concrete dams during long-term operation.In line with the characteristics of artificial aggregate production system for the dam concrete of Wudongde Project,we summarized the whole process of aggregate production from raw material mining to aggregate processing,and put forward measures of optimizing the production techniques of coarse and fine aggregates.Results manifested that the particle size of coarse aggregate is effectively controlled,and the output and quality of fine aggregate(fineness modulus,stone powder content and particle content)are improved,hence enhancing the quality of dam concrete production for Wudongde Project.The quality and safety of the dam’s entire life cycle have also been guaranteed.