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介绍了糯扎渡水电工程花岗岩骨料碱活性试验的研究结果。岩相法检测结果表明,糯扎渡水电工程花岗岩骨料中含有一定量的隐-微晶石英和硅质,这两种成分具有潜在的碱-硅酸反应活性。砂浆棒快速法试验结果表明,砂、小石、中石和大石14 d砂浆膨胀率均小于0.1%的限值,但14 d后膨胀率发展速率较快,养护龄期延长至105 d时,各级骨料的砂浆膨胀率均远超过0.2%的限值,且试件膨胀率仍继续发展,这些骨料属于后期膨胀较快的骨料,建议给予关注,在工程应用中对这些骨料应采取适当的抑制措施,以保证工程安全。研究结果为准确判定糯扎渡水电工程花岗岩骨料的碱活性提供了技术支持,为保证工程质量奠定了基础。
The results of research on the alkaline activity of granite aggregate in Nuozhadu Hydropower Project are introduced. The results of lithofacies analysis show that the granite aggregate of Nuozhadu Hydropower Project contains a certain amount of crypto-microcrystalline quartz and siliceous, both of which have potential alkali-silicic acid reactivity. The results of quick test of mortar bars showed that the mortar expansions of sand, small stone, stone and boulder were all less than 0.1% for 14 days, but the rate of expansion was faster after 14 days. When the curing age was extended to 105 days, Aggregate mortar expansion rates are far exceeded the limit of 0.2%, and the specimen expansion rate continues to develop, these aggregates belong to the late rapid expansion of the aggregate, it is recommended to pay attention to these applications in the aggregate should be taken Appropriate suppression measures to ensure project safety. The results provide technical support for accurately determining the alkali activity of granite aggregate of Nuozhadu Hydropower Project, which lays the foundation for ensuring the project quality.