Development and performance evaluation of sustainable lightweight geopolymer based fireproofing coatings for steel construction

This study developed a novel, sustainable, lightweight, and high-ductility fireproofing coating using granulated blast furnace slag (GBFS), fly ash microspheres (FAC), alkali activator, and polyethylene (PE) fiber as raw materials. The critical mixing ratios of FAC to GBFS (4:6), the water-to-binder...

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Main Authors: Zhenyu Huang, Yingwu Zhou, Hammad Salahuddin
Format: Article
Language:English
Published: Sustainable Development Press Limited 2024-09-01
Series:Sustainable Structures
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Online Access:http://www.sustain-dpl.com/UploadFile/article/202409031347295886.pdf
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author Zhenyu Huang
Yingwu Zhou
Hammad Salahuddin
author_facet Zhenyu Huang
Yingwu Zhou
Hammad Salahuddin
author_sort Zhenyu Huang
collection DOAJ
description This study developed a novel, sustainable, lightweight, and high-ductility fireproofing coating using granulated blast furnace slag (GBFS), fly ash microspheres (FAC), alkali activator, and polyethylene (PE) fiber as raw materials. The critical mixing ratios of FAC to GBFS (4:6), the water-to-binder ratio (0.55), and the alkali activator modulus (1.4) were determined to meet the requirements for fluidity, compressive strength, and flexural strength. The residual strength and thermal stability of the sample were evaluated through high-temperature exposure tests. The compressive strength results showed that even at 900℃, the lightweight geopolymer-based fireproofing coating exhibited 23 MPa as compared to that of 61 MPa at room temperature, which is 30% of its room temperature strength. X-ray diffraction and scanning electron microscopy were carried out to examine the micro-morphology of the samples, revealing that the main component of the geopolymer was Ca2(Al2SiO7) in a colloidal state at 30℃, 300℃, and 600℃. The reduction in strength at this temperature range was mainly attributed to the surface crack extension. However, at 900℃, the gelatinous Ca2(Al2SiO7) underwent dehydration and transformed into crystalline Ca2(Al2SiO7), or zeolite. The interface bond performance between the fireproofing coating and the steel plate was thoroughly tested through direct shear and normal bond tests, using five different bonding techniques, as well as a tensile test on the fire-resistant material coated steel plate. The bond strength from direct shear test ranged from 0.05 MPa to 1.64 MPa and for normal shear test, the strength was in the range of 0.07 MPa to 1.43 MPa. The results of tensile strength test showed that the coating had high ductility and was fire-resistant, and it could deform synergistically with the steel plate, with a maximum tensile strain of 4%. These results demonstrate the coating's excellent deformation performance.
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institution Kabale University
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spelling doaj-art-1507f8b8972e4f01b5783d7609f36e5e2025-02-01T08:27:20ZengSustainable Development Press LimitedSustainable Structures2789-31112789-312X2024-09-012410.54113/j.sust.2024.000044Development and performance evaluation of sustainable lightweight geopolymer based fireproofing coatings for steel constructionZhenyu Huang0Yingwu Zhou1Hammad Salahuddin2Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen, China 518060Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen, China 518060Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University, Shenzhen, China 518060This study developed a novel, sustainable, lightweight, and high-ductility fireproofing coating using granulated blast furnace slag (GBFS), fly ash microspheres (FAC), alkali activator, and polyethylene (PE) fiber as raw materials. The critical mixing ratios of FAC to GBFS (4:6), the water-to-binder ratio (0.55), and the alkali activator modulus (1.4) were determined to meet the requirements for fluidity, compressive strength, and flexural strength. The residual strength and thermal stability of the sample were evaluated through high-temperature exposure tests. The compressive strength results showed that even at 900℃, the lightweight geopolymer-based fireproofing coating exhibited 23 MPa as compared to that of 61 MPa at room temperature, which is 30% of its room temperature strength. X-ray diffraction and scanning electron microscopy were carried out to examine the micro-morphology of the samples, revealing that the main component of the geopolymer was Ca2(Al2SiO7) in a colloidal state at 30℃, 300℃, and 600℃. The reduction in strength at this temperature range was mainly attributed to the surface crack extension. However, at 900℃, the gelatinous Ca2(Al2SiO7) underwent dehydration and transformed into crystalline Ca2(Al2SiO7), or zeolite. The interface bond performance between the fireproofing coating and the steel plate was thoroughly tested through direct shear and normal bond tests, using five different bonding techniques, as well as a tensile test on the fire-resistant material coated steel plate. The bond strength from direct shear test ranged from 0.05 MPa to 1.64 MPa and for normal shear test, the strength was in the range of 0.07 MPa to 1.43 MPa. The results of tensile strength test showed that the coating had high ductility and was fire-resistant, and it could deform synergistically with the steel plate, with a maximum tensile strain of 4%. These results demonstrate the coating's excellent deformation performance.http://www.sustain-dpl.com/UploadFile/article/202409031347295886.pdfgeopolymerfireproofing coatingmixing ratiofire-resistanceductilitysustainable materials
spellingShingle Zhenyu Huang
Yingwu Zhou
Hammad Salahuddin
Development and performance evaluation of sustainable lightweight geopolymer based fireproofing coatings for steel construction
Sustainable Structures
geopolymer
fireproofing coating
mixing ratio
fire-resistance
ductility
sustainable materials
title Development and performance evaluation of sustainable lightweight geopolymer based fireproofing coatings for steel construction
title_full Development and performance evaluation of sustainable lightweight geopolymer based fireproofing coatings for steel construction
title_fullStr Development and performance evaluation of sustainable lightweight geopolymer based fireproofing coatings for steel construction
title_full_unstemmed Development and performance evaluation of sustainable lightweight geopolymer based fireproofing coatings for steel construction
title_short Development and performance evaluation of sustainable lightweight geopolymer based fireproofing coatings for steel construction
title_sort development and performance evaluation of sustainable lightweight geopolymer based fireproofing coatings for steel construction
topic geopolymer
fireproofing coating
mixing ratio
fire-resistance
ductility
sustainable materials
url http://www.sustain-dpl.com/UploadFile/article/202409031347295886.pdf
work_keys_str_mv AT zhenyuhuang developmentandperformanceevaluationofsustainablelightweightgeopolymerbasedfireproofingcoatingsforsteelconstruction
AT yingwuzhou developmentandperformanceevaluationofsustainablelightweightgeopolymerbasedfireproofingcoatingsforsteelconstruction
AT hammadsalahuddin developmentandperformanceevaluationofsustainablelightweightgeopolymerbasedfireproofingcoatingsforsteelconstruction