Effect of elevated temperature on mechanical properties of ceramic brick and metakaolin waste-based geopolymer mortar

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F25%3APU156008" target="_blank" >RIV/00216305:26110/25:PU156008 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0950061825005793" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0950061825005793</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.conbuildmat.2025.140431" target="_blank" >10.1016/j.conbuildmat.2025.140431</a>

Result language

angličtina

Original language name

Effect of elevated temperature on mechanical properties of ceramic brick and metakaolin waste-based geopolymer mortar

Original language description

The exponential growth of the construction industry has resulted in a corresponding increase in CO2 emissions, driven by rising demand for concrete and other materials. Consequently, there is a growing demand for sustainable building materials, including alkali-activated materials. From a safety perspective, alkali-activated material systems demonstrate superior fire durability characteristics compared to conventional concrete systems. This study examines the reaction of geopolymer mortar systems to elevated temperatures and the extent to which mechanical properties are influenced. The geopolymer compositions are comprised of two precursors: ceramic brick and metakaolin waste. There has been an increasing substitution of ceramic brick waste with waste metakaolin, with replacement ratios spanning a range from 20 % to 100 %. The alkaline activator comprised sodium hydroxide (NaOH) in a water-based solution; dosage based on the Na2O/Al2O3 ratio (1.00-1.04). The geopolymer system was investigated through the use of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and scanning electron microscopy (SEM) for the purposes of mineralogy and microstructural analysis. The residual compressive strength of geopolymer mortar specimens was determined following exposure to temperatures of 300, 600, and 900 degrees C. The findings indicate that the selected precursor materials are appropriate to produce temperature-resistant geopolymer mortar, as all compositions remained a strength of over 50 % and exhibited no spalling effect following a 900 degrees C treatment. Additionally, an impressive increase in compressive strength was observed when the precursor was solely ceramic brick waste, with a 101.8 % enhancement due to secondary geopolymerization, which induces a sintering effect leading to a more compact geopolymer microstructure.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20100 - Civil engineering

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

CONSTRUCTION AND BUILDING MATERIALS

ISSN

0950-0618

e-ISSN

1879-0526

Volume of the periodical

470

Issue of the periodical within the volume

4

Country of publishing house

GB - UNITED KINGDOM

Number of pages

13

Pages from-to

1-13

UT code for WoS article

001435230900001

EID of the result in the Scopus database

2-s2.0-85218456941