Study on Metakaolin Impact on Concrete Performance of Resisting Complex Ions Corrosion

Chen, Xupeng; Sun, Zhuowen; Pang, Jianzhang

doi:10.3389/fmats.2021.788079

Cited by 10 publications

(5 citation statements)

References 43 publications

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“…Metakaolin (MK) is an essential material used for producing geopolymers. It is mainly a pozzolanic material created from kaolin (China clay) clay through calcination at high temperatures (600 to 900 • C), where it undergoes amorphization and develops into a material with high reactivity [73]. Examinations of durability indicate that metakaolin geopolymers have enhanced characteristics with regard to water resistance, thermal resistance, and resistance against corrosion.…”

Section: Metakaolin (Mk)mentioning

confidence: 99%

Comprehensive Analysis of Geopolymer Materials: Properties, Environmental Impacts, and Applications

Sbahieh,

McKay,

Al-Ghamdi

2023

Materials

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The advancement of eco-friendly technology in the construction sector has been improving rapidly in the last few years. As a result, multiple building materials were developed, enhanced, and proposed as replacements for some traditional materials. One notable example presents geopolymer as a substitute for ordinary Portland concrete (OPC). The manufacturing process of (OPC) generates CO2 emissions and a high energy demand, both of which contribute to ozone depletion and global warming. The implementation of geopolymer concrete (GPC) technology in the construction sector provides a path to more sustainable growth and a cleaner environment. This is due to geopolymer concrete’s ability to reduce environmental pollutants and reduce the construction industry’s carbon footprint. This is achieved through its unique composition, which typically involves industrial byproducts like fly ash or slag. These materials, rich in silicon and aluminum, react with alkaline solutions to form a binding gel, bypassing the need for the high-energy clinker production required in OPC. The use of such byproducts not only reduces CO2 emissions but also contributes to waste minimization. Additionally, geopolymer offers extra advantages compared to OPC, including improved mechanical strength, enhanced durability, and good stability in acidic and alkaline settings. Such properties make GPC particularly suitable for a range of construction environments, from industrial applications to infrastructure projects exposed to harsh conditions. This paper comprehensively reviews the different characteristics of geopolymers, which include their composition, compressive strength, durability, and curing methods. Furthermore, the environmental impacts related to the manufacturing of geopolymer materials were evaluated through the life-cycle assessment method. The result demonstrated that geopolymer concrete maintains positive environmental impacts due to the fact that it produces fewer carbon dioxide CO2 emissions compared to OPC concrete during its manufacturing; however, geopolymer concrete had some minor negative environmental impacts, including abiotic depletion, human toxicity, freshwater ecotoxicity, terrestrial ecotoxicity, and acidification. These are important considerations for ongoing research aimed at further improving the sustainability of geopolymer concrete. Moreover, it was determined that silicate content, curing temperature, and the proportion of alkaline solution to binder are the major factors significantly influencing the compressive strength of geopolymer concrete. The advancement of geopolymer technology represents not just a stride toward more sustainable construction practices but also paves the way for innovative approaches in the field of building materials.

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Section: Metakaolin (Mk)mentioning

confidence: 99%

Comprehensive Analysis of Geopolymer Materials: Properties, Environmental Impacts, and Applications

Sbahieh,

McKay,

Al-Ghamdi

2023

Materials

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“…The presence of CSH was observed in all specimens [41]. Most of CSH (13.6 %) and additionally formed katoite (Ca 3 Al 2 (SiO 4 ) 0.64 (OH) 9.44 ), the amount of which increased up to 5.9 %, were produced in the specimen TS25+MIX20, which contained both milled glass and waste metakaolin.…”

Section: Resultsmentioning

confidence: 93%

The Effect of a Complex Pozzolanic Additive Consisting of Milled Glass and Metakaolin on the Degradation of a Cementitious Composite With Ground Waste Glass Caused by Alkali-Silica Reaction

Barkauskas¹

2022

Ceramics - Silikaty

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This paper investigates the effect of partial replacement of cement by milled glass (MS), metakaolin (MK), and their mixture and partial replacement of sand by crushed glass (TS)on the physical and mechanical properties of a cementitious composite, as well as on the resistance of the composite to degradation caused by alkali-silica reaction (ASR). After 28 and 56 days of curing, the highest improvement in the mechanical properties was observed in the batches of specimens with the MS, MK and their mixture. The physical and mechanical properties of specimens with partially replaced sand to TS also deteriorated the least (the lowest expansion 0.02 %) with the application of the MS and MK mixture after 56 days of exposure to alkaline attack. XRD and microstructural analyses have shown that the reduction in expansion is due to the higher content of hydration products, as well as to the denser contact zone between the aggregate and the cementitious matrix.

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“…However, producing one metric ton of cement releases a substantial amount of CO 2 , i.e., 0.8 tons [9]. Researchers are continuously making efforts to overcome this problem by exploring the beneficial use of ground-granulated blast furnace slag [10], fly ash [11], metakaolin [12], and natural pozzolanas [13] as partial replacements for cement. These materials are also called supplementary cementitious materials, but their availability is limited.…”

Section: Introductionmentioning

confidence: 99%

New and Sustainable Coal Char-Based Paving Blocks for Roadway Applications

Pandey,

Yu,

Lau

et al. 2024

Buildings

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Paving blocks are widely used in engineering construction for durable pavement surfaces characterized by their interlocking capability to enhance structural integrity. This study explores the potential use of char as a byproduct from coal pyrolysis and an alternative raw material to natural aggregates in developing paving blocks, aiming to reduce the associated environmental issues associated with the uncontrolled and excessive mining of natural resources. This study finds the paving blocks made from char to have the required engineering properties as mentioned by ASTM standard C936. Trass and trass-lime are added as supplementary cementitious materials (SCMs) to enhance the performance of char-based paving blocks. The incorporation of SCMs as a cement replacement also aims to reduce the carbon footprint arising from increased cement use. The compressive strength increased from 55.7 MPa to 65.71 MPa at 12.5% cement replacement with trass-lime. The water absorption is reduced to 4.63% from 4.95%. Beneficial effects towards freeze–thaw durability and abrasion resistance are also observed on trass-lime-incorporated paving blocks. This study signifies the remarkable potential use of coal-derived char and SCMs in developing light, high-strength, and durable paving blocks, showcasing their competitive engineering performance. These new char-based paving blocks will contribute towards a more sustainable construction environment and advance the current construction and engineering practices.

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Study on Metakaolin Impact on Concrete Performance of Resisting Complex Ions Corrosion

Cited by 10 publications

References 43 publications

Comprehensive Analysis of Geopolymer Materials: Properties, Environmental Impacts, and Applications

Comprehensive Analysis of Geopolymer Materials: Properties, Environmental Impacts, and Applications

The Effect of a Complex Pozzolanic Additive Consisting of Milled Glass and Metakaolin on the Degradation of a Cementitious Composite With Ground Waste Glass Caused by Alkali-Silica Reaction

New and Sustainable Coal Char-Based Paving Blocks for Roadway Applications

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