Paper Key : IRJ************785
Author: Ashish Semwal,Prince Yadav
Date Published: 25 Oct 2023
Abstract
The rapid growth of the construction industry has led to an increase in construction demolition waste (CDW), posing a significant environmental challenge. This study explores the potential of untreated recycled coarse aggregates (RCA) from CDW in concrete production, focusing on the hardened properties of concrete. RCA is systematically integrated into concrete mixes at varying proportions, and critical parameters like compressive strength, split tensile strength and flexural strength are evaluated for M30-grade concrete. Moreover, microstructural study such as scanning electron microscopy (SEM) was also conducted, which provide insight into the mechanisms and structural changes induced by the use of RCA. The experimental results reveal a nuanced relationship between RCA content and concrete's mechanical properties. Compressive strength declines gradually with increased RCA content, while split tensile and flexural strengths exhibit complex trends driven by RCA properties and the concrete matrix. SEM uncovers the interfacial transition zone between RCA and the cement matrix, elucidating bond characteristics and potential weaknesses. EDX sheds light on the elemental composition of concrete phases, revealing chemical interactions between RCA and cementitious materials.