|Table of Contents|

Bending and Tensile Toughness of Fiber-reinforced Cementitious Composites with Reactivity Recycled Powder(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年06期
Page:
34-42
Research Field:
建筑材料
Publishing date:

Info

Title:
Bending and Tensile Toughness of Fiber-reinforced Cementitious Composites with Reactivity Recycled Powder
Author(s):
WU Rui-xue;  ZHANG Peng;  ZHAO Tie-jun;  GUO De-yang
(School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, Shandong, China)
Keywords:
recycled powder;  construction waste;  fiber-reinforced cementitious composite;  bending toughness;  tensile toughness;  strain hardening
PACS:
TU525.9
DOI:
10.19815/j.jace.2021.07001
Abstract:
The micro-structures of recycled powder were measured by scanning electron microscope, and the mineral composition and hydration products of recycled powder and its newmade cement-based materials were further determined by X ray fluorescence and X ray diffraction. The mechanical properties of fiber-reinforced cementitious composites(FRCC)with recycled powder were studied by bending and uniaxial tensile tests. The results show that recycled powder mainly contains calcium-silicon oxides and compounds, thereby possessing pozzolanic activity and promoting a secondary hydration in new cement-based materials. The incorporated recycled powder can effectively improve the tensile and bending strength of FRCC. The bending ductility of FRCC with recycled powder increases with the increase of fiber content, and an obvious strain-hardening characteristic occurs when the fiber content is 2%. FRCC has relative low ultimate strain and high ultimate load when fly ash is replaced by recycled powder in FRCC, and the increasing range all exceed 10%. In addition, the strain-hardening characteristic of FRCC including RMP and RBP is better than that of FRCC including RCP. The feasibility of recycled powder to prepare FRCC is verified when its toughness meets requirements, which provides a reference for the application of recycled powder in practical engineering materials.

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Last Update: 2022-12-20