Zhou, Yangsheng;
Zhang, Mingzhong;
You, Xianhui;
Liang, Yongning;
Ji, Tao;
(2026)
Effects of activator types on the bond strength and wind suction & vibration resistance of lightweight fireproof mortar.
Construction and Building Materials
, 514
, Article 145535. 10.1016/j.conbuildmat.2026.145535.
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Abstract
Lightweight fireproof mortar applied to high-rise steel structures is susceptible to spalling under the combined effects of wind suction & vibration, leading to fire protection failure. The use of alkali-activated cement containing powdery municipal solid waste incineration bottom ash (PMA), granulated blast furnace slag (GBFS), and desulfurization gypsum (DG) is expected to enhance their bond strength and fire resistance. The effect of activator types (CaO+Na2CO3, Ca(OH)2+Na2CO3, water glass + neutral sodium salt, and NaOH) on the drying time, setting time, dry density, fire resistance, compressive strength, bond strength, and wind suction & vibration resistance of PMA/GBFS/DG based lightweight fireproof mortar (PLFm, namely CNC, CHNC, WNO, NH, respectively) was investigated, and the mechanism was elucidated by XRD, TG-DTG, SEM, and MIP. Results show that the drying time and setting time of PLFm follow the order: WNO＞CNC＞CHNC＞NH, the dry density of PLFm follows the order: CHNC＞CNC＞NH＞WNO, and the compressive strength, bond strength and wind suction & vibration resistance of PLFm follow the order: CHNC＞CNC＞NH＞WNO. Wind suction & vibration resistance is determined by the bond strength, which is primarily controlled by the type and amount of hydration products, the interfacial compactness, and the pore structure. CHNC demonstrates the highest amount of hydration products, the most compact interfacial structure, the lowest total porosity, the best bond strength after wind suction & vibration (0.27 MPa), and therefore the best wind suction & vibration resistance.
| Type: | Article |
|---|---|
| Title: | Effects of activator types on the bond strength and wind suction & vibration resistance of lightweight fireproof mortar |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.conbuildmat.2026.145535 |
| Publisher version: | https://doi.org/10.1016/j.conbuildmat.2026.145535 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. This version is the author accepted manuscript. It has been made open access under the Creative Commons (CC BY) licence under the terms of the UCL Intellectual Property (IP) Policy and UCL Publications Policy. |
| Keywords: | Alkali-activated binder, Powdery municipal solid waste incineration bottom ash, Lightweight fireproof mortar, Activator type, Wind suction & vibration resistance |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10221271 |
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