Development of a sustainable concrete waste recycling system - application of recycled aggregate concrete produced by aggregate replacing method

ABSTRACT: The generation of huge amounts of construction waste is anticipated due to the demolition of older structures such as power stations built more than 30 years ago. On the other hand, the reuse of construction waste is highly essential from the viewpoint of Life Cycle Assessment (LCA) and effective recycling of construction resources. In order to promote the reuse of construction waste, it is necessary to achieve three basic concepts: (1) assurance of safety and quality, (2) decrease of environmental impact, and (3) increase of cost effectiveness of construction. This paper outlines the development of a recycling system, application of recycled aggregate concrete produced by the aggregate replacing method, which is effective in reducing both cost and environmental impact from the viewpoint of LCA for concrete waste generated by the demolition of large-scale buildings such as powerhouses

Editorial TVLSI Positioning - Continuing and Accelerating an Upward Trajectory

I. VLSI Systems: A Glance Into The Last Decades Since their inception in 1970s, VLSI systems have enabled several new technological capabilities and made them accessible to an unceasingly wider range of users, reaching a scale that has been exponentially increasing over the decades [1] (see Fig. 1). Relentless integration of more complex systems has driven such remarkable evolution, as made possible by the inexorable miniaturization. As shown in Fig. 1, more functionality has been crammed in a consistently smaller form factor, as exemplified by the physical volume shrinking of computers by 100 X/decade [2], [3]. At the same time, the energy per task has been decreasing at 10-100 X/decade, as shown in Fig. 2, for several systems and system-on-chip subsystems [4]. This allowed packing more capabilities into the same power envelope, as generally observed in the electronic systems, even before the advent of the integrated circuit [5]