|Table of Contents|

Study on tensile and crack properties of fiber-reinforced cementitious composites with recycled mortar powder(PDF)

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

Issue:
2023年04期
Page:
24-32
Research Field:
建筑材料
Publishing date:

Info

Title:
Study on tensile and crack properties of fiber-reinforced cementitious composites with recycled mortar powder
Author(s):
WU Ruixue;  ZHAO Tiejun;  GUO Deyang
(School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, Shandong, China)
Keywords:
recycled mortar powder;  construction waste;  fiber-reinforced cementitious composite;  tensile property;  crack distribution
PACS:
TU525.9
DOI:
10.19815/j.jace.2021.08037
Abstract:
It is an effective way to reuse construction waste by grinding and screening construction waste into recycled powder(recycled mortar powder, recycled concrete powder, etc.)and replacing cementitious materials to prepare cement mortar matrix. The microstructure of recycled mortar powder(RMP)was observed by scanning electron microscope and the mineral composition of RMP was determined by X-ray fluorescence. RMP was used to replace cement(the replacement rates were 12.5%, 25% and 50%, respectively)to prepare fiber-reinforced cementitious composites(FRCC). The uniaxial tensile stress-strain property and crack width and distribution under different strains were studied. The results show that compared with cement, RMP has a higher SiO2 content and a lower CaO content, which reduces the hydration reaction and matrix strength of cementitious materials to a certain extent. The particle size distribution of RMP is wider than that of cement, and the particles with smaller particle size can effectively fill the matrix gap. Therefore, when the substitution rate of RMP is large, it has little effect on the strength of the matrix. The three kinds of fiber-reinforced cementitious composites with recycled mortar powder(RMP-FRCC)show excellent strain hardening characteristics and multi-crack cracking ability. The ultimate strain reaches more than 8%, the crack distribution is uniform, and the average crack width under the limit strain state is below 100 μm. The replacement of 25% RMP with cement can significantly increase the strain hardening characteristics of FRCC, but the larger replacement rate(50%)will reduce the mechanical properties and strain indexes.

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Last Update: 2023-07-01