Preparation and Properties of Natural Bamboo Fiber-Reinforced Recycled Aggregate Concrete

• Published in: Materials Vol. 17; no. 12; p. 2972
• Main Authors: Xu, Binyu, Tian, Rongxi, Wang, Ying, Zhang, Zhen-Wen, Zhang, Zihua
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 18.06.2024; MDPI
• Subjects: Bamboo; Carbon; Cement; China; Concrete aggregates; Construction industry; Crack propagation; Decomposition; Fiber reinforced concretes; Mechanical properties; microstructure; natural bamboo fiber; Natural resources; orthogonal experiment; recycled concrete; Recycled materials; Refuse and refuse disposal; Reinforced concrete; Slaked lime; Tensile strength; Water-cement ratio; China; microstructure; orthogonal experiment; natural bamboo fiber; recycled concrete
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma17122972

To promote resource reuse and the green, low-carbon transformation of the construction industry, this study uses recycled aggregate from crushed waste concrete and natural bamboo fibers to formulate bamboo fiber-reinforced recycled-aggregate concrete. This study investigates the effects of natural bamboo fiber (NBF) content, NBF length, and the water-to-cement ratio on the performance of concrete through an orthogonal experiment to determine the optimal mixing proportions of NBF-reinforced concrete. Additionally, recycled aggregate completely replaced natural aggregate. The mechanism by which NBF influences concrete was also analyzed. The results demonstrate that the NBF-reinforced specimens exhibited good integrity during compression failure, with NBFs effectively tying the concrete together. The optimized parameters for NBF-reinforced concrete were an NBF length of 20 mm, an NBF content of 0.4v%, and a water-to-cement ratio of 0.55. Almost no flaky Ca(OH) crystals were observed in the NBF-hardened cement-paste transition zone, indicating effective bonding at the interface.