Performance Evaluation of Concrete Using Waste-Molten Slag and Its Application for Restoration of Sea-Waters Environment

为明确利用城市垃圾和工业废渣熔融渣配制混凝土和钢筋混凝土的力学性能，建立熔融渣的无损性能评价方法，考察熔融渣对海洋环境的修复作用，根据熔融渣的理化性能和新鲜性能的试验结果，为了提高使用熔融炉渣的混凝土的强度和耐久性，明确了熔融炉渣被用作混凝土的骨料。通过对熔融矿渣的摩擦改性，改善了其形态，降低了混凝土的单位用水量，提高了混凝土的抗压强度。此外，利用熔融矿渣对钢筋混凝土梁的抗弯和抗剪性能的试验结果表明，熔融矿渣可以用于钢筋混凝土构件。研究表明，钢渣的掺入对钢筋混凝土梁中钢筋的粘结应力-滑移关系影响不大。针对超声波法在混凝土性能评价中的应用，进行了模型试验和数值分析。然而，在普通骨料和熔渣中，边界条件的差异的影响没有用超声波进行评价。关于海洋环境的改善，发现使用熔渣的混凝土的附着猎物丰度是不使用熔渣的混凝土的7倍左右，熔渣混凝土周围鱼类聚集增加，底质中化学需氧量浓度降低。因此，可以得出结论，熔渣是有效的生物环境的改善材料。

The purpose of this study is to clarify the mechanical properties of concrete and reinforced concrete using municipal garbage and industrial waste molten slag, to develop a non-destructive performance evaluation method and to examine the effect of the molten slag on the restoration of sea environment.Based on the experimental results regarding the physical and chemical properties of molten slag and the fresh property, strength and durability of concrete using molten slag, it was clarified that the molten slag is utilized as an aggregate for concrete. It was also concluded that the shape improvement of molten slag by rubbing-reformation has deceased the unit quantities of water and improved the compressive strength of concrete. In addition, the experimental results on the flexural and shear behaviour of reinforced concrete beams using molten slag showed that the molten slag can be applied for reinforced concrete members. It was also clarified that the use of molten slag has little effect on the bond stress - slip relationship of reinforcing bar in reinforced concrete beams using molten slag.Regarding the application of ultrasonic wave method for evaluating the performance of concrete, model tests and numerical analysis were conducted. However, the effect of the difference of boundary condition in ordinary aggregate and molten slag was not evaluated with ultrasonic waves.Regarding the improvement of marine environment, it was found that the adherent prey abundance of concrete using molten slag is about 7 times as much as that of concrete without molten slag, the fish aggregation has increased around the molten slag concrete and the concentration of chemical oxygen demand has decreased in bottom sediment. Therefore, it can be concluded that the molten slag is effective as the improvement materials of biological environment.