Abstract
Sustainability of the construction industry is taking a priority worldwide. The objective of this work is to evaluate the contribution of double using of waste clay brick and waste plastic for some properties of high volume metakaolin concrete. Waste brick powder (BP), after grinding, was blended with metakaolin (MK) at (50:50) % by weight, and this blended powder was replaced for ordinary Portland cement (OPC) at ratio (50:50) %. Six mixtures were produced, including one control mixture and five mixes that have a substitution 30% by volume of natural coarse aggregate with different ratios of blended waste clay brick aggregate (BA) and plastic aggregate (PL). The essential focus of the study is to observe density, compressive and splitting strengths of mixtures containing waste aggregate along with their workability in comparison with the control mix. The results showed that inclusion of blended wastes aggregate have adversely effect on the concrete workability, and decline the density at fresh and hardened state. Also, the use of wastes aggregate (blended or solely) has reduced the splitting strength. Moreover, compressive strength of control mix was 38.3 MPa, while mixes with waste aggregate have ranged between 32.9 - 42.4 MPa. It is, therefore, more beneficial to produce sustainable concrete with moderate strength for variety applications in the construction sector.
Highlights
Concrete is by far one of the most important and extensively used building materials across the world, due to the rapid growth of population and development of urbanization cities
This type of waste aggregate was produced by shredding the waste plastic which was collected from municipal waste landfill in Baghdad city
It is clear that the use of waste brick aggregate or plastic waste aggregate have a significant negative impact on workability of high-volume blended MK-brick powder (BP) concrete
Summary
Concrete is by far one of the most important and extensively used building materials across the world, due to the rapid growth of population and development of urbanization cities. There is a major concern related to developing a green concrete that meets the future demands with low greenhouse gas emission and preservative of the natural resources In this philosophy, the green concrete essentially incorporates waste materials either as a binder (partial cement replacement) or as recycled aggregate. One of the most effective ways to minimize and reduce the amount of accumulated solid wastes (C&D and plastic) is to recycle and reuse them as part of concrete ingredients This would mitigate the environmental pollution and problems of scarce landfills dumping, but would provide alternative source of binder and aggregate in place of natural resources, toward sustainable concrete technology. This study will further promote the recycling and reusing of waste materials in the sustainable construction industry
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