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

本研究的目的是明确利用城市垃圾和工业废弃物熔渣制备的混凝土和钢筋混凝土的力学性能，建立一种无损性能评价方法，并研究熔渣对海洋环境恢复的影响。通过对矿渣的物理化学性能和使用矿渣的混凝土的新鲜性能、强度和耐久性的试验结果，阐明了矿渣作为混凝土骨料的可行性。通过对熔渣进行摩擦改造，改善了熔渣的形状，降低了单位水量，提高了混凝土的抗压强度。此外，对钢渣浇筑钢筋混凝土梁的抗弯抗剪性能进行了试验研究，结果表明，钢渣浇筑可以应用于钢筋混凝土构件。结果表明，钢渣的使用对钢渣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。但未对普通骨料和熔渣边界条件差异的影响进行超声评价。对于海洋环境的改善，研究发现，使用熔渣混凝土的附着猎物丰度约为未使用熔渣混凝土的7倍，熔渣混凝土周围的鱼类聚集增加，底部沉积物化学需氧量浓度降低。综上所述，熔渣是一种有效的生物环境改善材料。

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.