人工砂中的石粉含量对抗冲磨混凝土性能的影响

为了解决双江口水电站泄洪系统工程抗冲耐磨混凝土施工性能差、稠度大、不易排气等问题,以泄洪系统工程C₉₀50抗冲耐磨混凝土配合比设计及试验为基础,针对双江口水电站的原材料体系,开展人工砂中的石粉含量对抗冲耐磨混凝土性能的影响研究。对人工砂8%、10%、12%、14%不同石粉含量对抗冲耐磨混凝土拌和物坍落度和含气量的影响,以及不同石粉含量对混凝土抗压强度、劈拉强度、轴心抗拉强度、极限拉伸值等性能的影响进行研究分析。研究成果表明:人工砂石粉含量在10%左右时,抗冲耐磨混凝土综合性能最优,综合考虑各方面的因素,推荐人工砂石粉含量控制在11%~13%范围内,为后续抗冲耐磨混凝土配合比设计及试验工作奠定了基础,也为双江口水电站人工砂的生产提供了技术指导。

Influence of Stone Powder Content in Artificial Sand on Properties of Anti-abrasion Concrete

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.