Properties of microscopic particle morphology and particle contact of renewable construction waste mixtures. (20th May 2019)

• Record Type: Journal Article
• Authors: Li, Zhe; Liu, Lulu; Yan, Shihao; Zhang, Mengke; Xie, Yongli
• Is Part Of: Construction & building materials. Volume 207(2019)
• Page Start: 190
• Page End: 205
• Publication Date: 2019-05-20
• Subjects: Construction waste -- Particle morphology -- Particle contact -- CT scan; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2019.02.135
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Three evaluation indicators (i.e., size, contour shape and angularity) are proposed. Classification method of renewable construction waste particles was determined. Three particle contact structures between particles were obtained. Contact forms between particles are analyzed considering the particle breakage. Abstract: Diversity in microscopic particle morphology and the particle contact between geomaterials can play an important role in terms of their respective mechanical properties. In this paper, a series of laboratory tests, including a compaction test, sieving test, and a CT scan test have been conducted on renewable construction waste mixtures from the Xi-Xian Highway. Using Image-Pro Plus to identify CT scan images, the quantitative indicators of aggregate particle size, contour shape, and angularity were determined, and the classification method and standard of renewable construction waste particles were determined. According to the particle contact form in the CT scan image, the construction waste particle contact can be divided into a suspension-dense structure, a skeleton-fill structure, and a skeleton-porosity structure. Furthermore, this paper analyses the destruction mode of construction waste particles and reveals the destruction mechanism of recycled construction waste mixtures. This study analyses in detail the mesoscopic characteristics of renewable construction waste mix and provides a technical reference for the broadening research and popularisation of construction waste mix.