Combined effect of compaction level and matric suction conditions on flexible pavement performance using construction and demolition waste. (20th November 2020)

• Record Type: Journal Article
• Authors: Arab, Mohamed G.; Alzara, Majed; Zeiada, Waleed; Omar, Maher; Azam, Abdelhalim
• Is Part Of: Construction & building materials. Volume 261(2020)
• Publication Date: 2020-11-20
• Subjects: Pavement life -- Rutting -- Bottom-up fatigue cracking -- Matric suction -- Compaction effort -- AASHTOWare -- Statistical analysis -- Construction and demolition waste; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2020.119792
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Compaction and matric suctions have significant effect on C&D properties. Compaction level in general increases the C&D waste material matric suction at specific moisture content. Pavement performance can be significantly altered by the compaction level of C&D waste material used as base layer. The effect of initial moisture content of the C&D waste material base layer is less significant than the effect of the compaction level on pavement performance. Abstract: The characteristics of the unbound base layer have been recognized to influence the performance of flexible pavements to wide extents depending on climate conditions, construction quality, material source, traffic level, and pavement structure. Recently, unsaturated soil modeling has become generally accepted in predicting the pavement performance as pavement layers are typically placed well above soil water table, and tend to remain unsaturated during pavement service life. This paper investigates the combined impact of compaction level and initial matric suctions of construction and demolition (C&D) waste material used as a based layer on simulated pavement performance using the AASHTOWare Pavement ME Design software. Towards the preparation of the software inputs as per level 1 requirements, a laboratory experimental program was conducted on C&D material which includes the construction of soil water characteristic curve (SWCC) and determination of resilient modulus at four different moisture contents and two levels of compaction effort. The simulated pavement performance analyses consider two climatic conditions (dry and wet), two groundwater table levels (shallow and deep), two types of subgrade soil (strong and weak), and two thickness levels for the base and asphalt surface layers (thin and thick). Full statistical analyses of the main and interaction effects were performed on the results of AASHTOWare Pavement ME Design software. The results showed that the compaction level has more significant effect on the base and subgrade rutting and bottom-up fatigue cracking than the initial matric suction. In addition, both initial matric suction and SWCC input level were found to have a significant effect on all simulated distresses. Furthermore, the interaction between the compaction and initial matric suction was found to be significant.