龙滩大坝碾压混凝土质量控制的关键要素

龙滩碾压混凝土坝是目前世界上在建的最高的碾压混凝土重力坝,碾压混凝土的各项技术性能指标要求较高,对质量控制与管理提出了极高的要求。龙滩大坝碾压混凝土质量控制注重材料供应、施工过程、质量检查三者并重,重点控制VC值、碾压间隔时间、压实度三要素,制定了快速的施工技术措施。经检测,大坝碾压混凝土一次性合格率99%,补碾后合格率100%,大坝总体质量良好。

Key Factors of RCC Quality Control in Longtan Dam

The Longtan RCC dam is the highest gravity dam in the world under construction, the technical parameters for RCC is very high in standard. Therefore, high requirements are proposed concerning the project management and quality control. The philosophy for measures taken for quality control at Longtan is emphasize on the parallel importance for the critical process like material submittals, construction process and quality field inspection etc., great attention is specially paid to the control of VC value ,the time interval of the joint,and compaction degree.The quick technical scheme for construction is prepared and approved exactly following the quality control philosophy and its key points.It is shown by the test that the pass rate for the compaction degree reaches to 99% in one compaction and the passed rate is 100% after the re-compaction.The overall quality of the dam is good and under control.