การปรับปรุงวัสดุหินคลุกรีไซเคิลและแอสฟัลต์คอนกรีตรีไซเคิลสำหรับการนำไปใช้เป็นชั้นพื้นทางของถนนแบบยืดหยุ่นด้วยจีโอโพลิเมอร์คอมโพสิตจากเถ้าชานอ้อยและเถ้าลอย

Sattawat  Chatchawan; Ratamanee  Nuntasarn

Authors

Sattawat Chatchawan Student, Doctor of Philosophy Program in Civil Engineering, Faculty of Engineering, Khon Kaen University
Ratamanee Nuntasarn Associate Professor, Department of Civil Engineering, Faculty of Engineering, Khon Kaen University

Keywords:

C&D materials, Bagasse ash geopolymers, Base of flexible pavement

Abstract

This paper aims to study the improvement of recycled crush rock (RCR) and recycled asphalt pavement (RAP) aggregates with bagasse ash (BA) and fly ash (FA) geopolymer for base of flexible pavement material. The objective is to conserve natural resources and minimize waste. This research focused on the mechanical properties and workability time for compaction of stabilized material. The results indicated that a BA geopolymer enhanced the strength of compacted RCR and RAP. Further improvement of these materials was achieved by partially replacing BA with FA, leading to a reduced demand for alkali solution and increased density. Adding FA to the mixture improved the SiO₂/Al₂O₃ ratio in the system, resulting in improved strength of materials. However, excessive FA led to brittleness and reduced workability time. A 50:50 mix of RCR and RAP with geopolymer (BA and FA, 5% total ash, FA 31.5% to 40% of total ash), mixed with sodium silicate and 8 M NaOH, is recommended.

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