eprintid: 10187643
rev_number: 8
eprint_status: archive
userid: 699
dir: disk0/10/18/76/43
datestamp: 2024-02-23 10:13:07
lastmod: 2025-02-22 07:10:06
status_changed: 2024-02-23 10:13:07
type: article
metadata_visibility: show
sword_depositor: 699
creators_name: Lv, Leyang
creators_name: Zhang, Xiangyu
creators_name: Šavija, Branko
creators_name: Zhang, Mingzhong
creators_name: Han, Kaihang
creators_name: Zhang, Honghzhi
creators_name: Pei, Chun
creators_name: Zhu, Jihua
creators_name: Xing, Feng
title: Self-healing of cementitious materials using sustainable cenosphere-based manufactured aggregate
ispublished: pub
divisions: UCL
divisions: B04
divisions: C05
divisions: F44
keywords: Self-healing concrete, Encapsulated healing agent, Cenosphere, Hydration, Microstructure, Engineering properties
note: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
abstract: Self-healing concrete using encapsulated healing agent has shown great potential in enhancing concrete durability. However, the capsules are expensive to make and can lower the mechanical properties of concrete. In this study, a new type of manufactured aggregate that employs waste-derived fly ash cenosphere as a carrier of healing agent (SH-CS) was designed and produced. The effect of SH-CS incorporation on hydration, engineering properties and self-healing efficiency of cement mortar was systematically evaluated, with a special focus on self-healing mechanism through the analysis of the mineral composition of the healing product. The results indicate that the prepared SH-CS has good stability in and compatibility with cement mortar. The addition of SH-CS has small influence on the fresh properties of cement mortar and less negative effect on compressive strength at the hardened stage compared to the existing study. By replacing 3 wt.% of fine aggregate with SH-CS, up to 71% of the crack opening area of mortar specimens with a crack width of about 0.3 mm was self-healed after 28 days of water exposure. The self-healing behaviour of SH-CS led to a maximal 41% drop in water adsorption and contributed to the recovery of flexural strength. The healing products precipitated on the fracture surface were mainly composed of amorphous C-S-H and Calcite. It can be estimated that incorporating SH-CS in concrete would result in only a moderate (∼29%) rise in cost for C40 concrete.
date: 2024-03-15
date_type: published
publisher: Elsevier BV
official_url: http://dx.doi.org/10.1016/j.conbuildmat.2024.135361
oa_status: green
full_text_type: other
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_id: 2249734
doi: 10.1016/j.conbuildmat.2024.135361
lyricists_name: Zhang, Mingzhong
lyricists_id: MZHAA72
actors_name: Zhang, Mingzhong
actors_id: MZHAA72
actors_role: owner
full_text_status: public
publication: Construction and Building Materials
volume: 419
article_number: 135361
issn: 0950-0618
citation:        Lv, Leyang;    Zhang, Xiangyu;    Šavija, Branko;    Zhang, Mingzhong;    Han, Kaihang;    Zhang, Honghzhi;    Pei, Chun;         ... Xing, Feng; + view all <#>        Lv, Leyang;  Zhang, Xiangyu;  Šavija, Branko;  Zhang, Mingzhong;  Han, Kaihang;  Zhang, Honghzhi;  Pei, Chun;  Zhu, Jihua;  Xing, Feng;   - view fewer <#>    (2024)    Self-healing of cementitious materials using sustainable cenosphere-based manufactured aggregate.                   Construction and Building Materials , 419     , Article 135361.  10.1016/j.conbuildmat.2024.135361 <https://doi.org/10.1016/j.conbuildmat.2024.135361>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/10187643/1/Accepted%20Version.pdf