关键词: 人工砂, 石粉含量, 双江口水电站, 抗冲耐磨混凝土, 配合比, 抗冲磨强度, 极限拉伸值

Abstract: The anti-scour and wear-resistant concrete in the flood discharge system project of Shuangjiangkou Hydropower Station is of inferior construction performance and high consistency, and is difficult to exhaust air. On the basis of mix proportion design and test of C₉₀50 anti-scour and wear-resistant concrete in the flood discharge system, the influence of stone powder content in artificial sand on the performance of anti-scour and wear-resistant concrete in the raw material system of Shuangjiangkou Hydropower Station is investigated. The effects of stone powder content (8%, 10%, 12% and 14%) in artificial sand on the slump and air content of anti-scour and wear-resistant concrete mixture were examined, and the impacts of different stone powder content on the compressive strength, splitting tensile strength, axial tensile strength and ultimate tensile value of concrete were scrutinized. Results show that when the content of stone powder is about 10%, the anti-scour and wear-resistant concrete has an optimum comprehensive performance. In consideration of all factors, the content of stone powder is recommended to be controlled in the range of 11%-13%. The research finding lays a foundation for the mix proportion design and test of anti-scour and wear-resistant concrete, and also provides technical guidance for the production of artificial sand in Shuangjiangkou Hydropower Station.

Key words: artificial sand, stone powder content, Shuangjiangkou hydropower station, impact and abrasion resistant concrete, mix proportion, abrasion resistance strength, ultimate tensile value