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碾压混凝土大坝材料的耐久性是一个值得关注的问题。该文以水东枢纽工程为例 ,从坝址环境水质特征、潜在的碱骨料反应等方面对其作了论述。指出在具较好连通性的毛细孔及施工不密实孔等部位 ,环境水对于Ca(OH) 2 一类物质的溶出型侵蚀作用将以相对集中的渗漏方式为主 ,因而对于大坝的抗化学侵蚀性较为不利 ;控制大坝材料中的总含碱量 (如小于 1 80kg/m3)可以作为判定潜在的碱骨料反应发生与否的一个重要依据
The durability of RCC dam materials is a concern. Taking the Shuidong hub project as an example, this paper discusses the characteristics of environmental water quality and potential alkali-aggregate reaction in dam site. It is pointed out that the erosive erosion of environmental water with Ca (OH) 2 will be dominated by relatively concentrated leakage in the areas of well-connected pores and poorly-constructed holes. Therefore, Chemical resistance is more unfavorable. Controlling the total alkali content (eg less than 180kg / m3) in dam materials can be used as an important basis for judging the potential occurrence of alkali-aggregate reaction