关键词: 钢渣骨料, 水工生态框混凝土, 细颗粒, 粗颗粒, 体积取代, 抗压强度, 电通量, 安定性

Abstract: There are both coarse and fine particles in steel slag without fine crushing and screening treatment，aggregate with poor gradation and workability appeared when steel slag replace sand or stone alone.In order to find a method suitable for different sources of steel slag during hydraulic ecological frame concrete preparation，steel slag from Baosteel was regarded as the research object.The steel slag aggregate is divided into coarse particles and fine particles，respectively，and the design of appropriate mix ratio were determined by gradation analysis.Mixture performanc，mechanical properties，durability and stability of the concrete test block prepared under the appropriate mix ratio were tested，and the maximum dosage of steel slag aggregate in the concrete of hydraulic ecological frame was analyzed and determined.The results showed that the coarse particles in steel slag aggregate are between 5~16 mm continuously gradation and 5~20 mm continuously gradation，which can basically meet the requirements of 5~25 mm or 5~20 mm continuously gradation gravel when combined with gravel of 5~25 mm continuously gradation.The gradation of fine particles does not meet the requirements of zone Ⅰ，zone Ⅱ or zone Ⅲ，so it needs to be used with medium sand.The proportion of fine particles replacing natural river sand in zone Ⅱ should not exceed 25%，and the highest proportion should not exceed 45%.The apparent density of steel slag is different from that of sand and stone aggregate.When steel slag aggregate replaces sand and stone in the preparation of hydraulic ecological frame concrete，fine particles and coarse particles should replace sand and stone by volume percentage respectively.The concrete test block of steel slag aggregate hydraulic ecological frame prepared by the above method has good workability，the compressive strength at 28 days of the concrete test block increases by 10%~20%，and the electric flux decreases to less than 700 C at 56 days.However，when the volume replacement ratio of steel slag aggregate exceeds 30%，the stability of concrete test blocks becomes worse.It is suggested that the maximum volume replacement ratio of steel slag aggregate in hydraulic ecological frame concrete should be controlled within 30%.

Key words: steel slag aggregate, hydraulic ecological frame concrete, fine particles, coarse particles, volume substitution, compressive strength, electric flux, stability