Capacity to Develop Recycled Aggregate Concrete in South East Asia

Abstract

The global sustainable construction aimed to minimize the ecological impacts of constructed facilities’ lifetime. In construction, concretes are the major materials utilized in South East Asia. Thus, it makes environmental and economic sense to utilize recycled materials in the production of new concretes for diverse uses. This review indicated that the practical implementations of the recycled aggregate concretes (RAC) in the area is greatly lacking, even though there are reasonable studies on RAC, particularly because of lack awareness and economic viability of such uses at the present period. This research aims to establish an interdisciplinary consortium with researchers, policy makers, practitioners, and social scientists in Southeast Asia to investigate the development of sustainable, durable, cost-effective, green concrete by utilizing recycled aggregates. Concentrating on waste resource recovery, this research presents an integrated modeling method. The approaches track and forecast a variety of values across technical, economic, social, and environmental areas linking these to the material flow and therefore integrating and building upon one-dimensional models like life cycle assessments (LCAs) and material flow analyses (MFAs). Additionally, the analysis of this study supported the recycling of cement for general use in construction, emphasizing the feasibility, reliability, and longevity of a project at the same time. However, the analysis also demonstrated that although there is fair progress on recycled concrete, there is still a severe lack of appropriate development in particular because of the lack of economic sustainability and knowledge of such applications at present. Raw material conservations were recorded; carbon dioxide costs and footprint were also reduced. Considering the RAC economic, technical, and environmental parameters, frameworks were applied for sustainable selections with target compressive strengths as the major goal.

Sound-Absorbing Acoustic Concretes: A Review

“…In addition, even with lighter concrete, such as the concrete coating increases with crumb rubber and fibre, the results obtained for sound insulating at high frequencies are further enhanced [130]. As a result, high replacement of aggregate (80-100%) can be carried out in concrete for non-bearing structures to increase sound absorption [127,[131][132][133]. Furthermore, Table 8 shows the acoustic absorption property of the different concrete types, as several researchers have reported.…”

Prediction of Shear Strength of Reinforced Recycled Aggregate Concrete Beams without Stirrups

“…The previous ACI 318 simplified shear equation (Equation (1)) does not consider the effect of longitudinal reinforcement ratio in the shear strength prediction. However, this shortcoming has been improved in ACI 318-19 by introducing ρ w in the shear expression, as indicated in Equation (2). The difference between normalized shear stress predicted by ACI 318-14 and ACI 318-19 shear provisions at different longitudinal reinforcement ratios is plotted in Figure 8.…”

“…The production of new concrete also poses the problem of natural resource depletion due to the production of cement and to the extraction of natural coarse aggregates. Several studies exist on recycling construction and demolition waste to decrease the consumption demand of natural resources and reduce construction waste [1][2][3][4]. Since the largest source of CDW is concrete, numerous research studies have also examined the use of recycled coarse aggregate (RCA) to produce recycled aggregate concrete (RAC), of which the mechanical properties and durability are typically compared to those of natural coarse aggregate concrete (NAC) [5][6][7][8][9][10][11][12][13].…”

A Sustainable Reuse of Agro-Industrial Wastes into Green Cement Bricks

“…Bricks are common building materials actively applied in the vast majority of construction works. Because of their remarkable features, such as high strength, low production costs, and durability, bricks have played an important role in construction for thousands of years [ 1 , 2 , 3 ]. Brick was an important building material in Egypt, Roman, and Mesopotamia [ 4 ].…”