茄子山面板坝面板混凝土配合比试验研究

Test and study on the mix proportion of the face slab concrete for the facing rockfill dam in the Qiezishan Reservoir

茄子山水库面板堆石坝面板混凝土配合比试验的基本思路是在满足设计要求的前提下 ,本着就地取材、经济合理原则 ,为快速滑模施工提供脱模后不下坍、不开裂、凝结时间合适的优质混凝土。由于当地仅有的花岗岩机制砂云母含量超标达 7% ,为降低云母含量 ,提出了与龙陵灰岩人工砂按 1∶1混合使用的配合比 ,对此通过对比试验研究了云母含量对混凝土性能的影响。实践证明 :混凝土现场抽检与试验结果一致 ,各项指标均达到要求 。

The basic object of the tests on the concrete for face slab of concrete facing rockfill dam of Qiezishan Reservoir is to produce high quality concrete with non slump and no crack after knock out and with favorable set time for the quick slipform construction, under the condition of design requirements and in accordance with the principles of using the local materials and economic reasonableness Because the local machine made granite sand has high mica content of more than 7%, the artificial Longling limestone sand was used to mix with the machine made granite sand in a proportion of one to one in order to reduce the mica content Through the comparison test, we study the impact of mica content on the concrete properties The practice showed that on the spot check of such concrete is identical with its test results and its various indexes meet the requirements Therefore, low mica content could not bring big impacts on the quality of concrete