Alkali activated repair mortars based on different precursors

Ducman, Vilma; Kramar, Sabina; Šajna, Aljoša

doi:10.1016/b978-0-08-102181-1.00011-3

Cited by 4 publications

(4 citation statements)

References 58 publications

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“…Additional work reporting material parameters and characterisation of these concretes (and their constituent pastes and mortars), including permeability, porosimetry and more detailed microstructural analysis related to durability, has been published by various participating groups in publications including [5,13,[15][16][17][18][19][20]. In two papers that will follow this publication, round-robin test results for chloride migration/diffusion, carbonation, alkali-silica reaction, sulfate and freeze-thaw/frost-salt resistance, will be presented and discussed.…”

Section: General Remarks and Connected Studiesmentioning

confidence: 99%

RILEM TC 247-DTA round robin test: mix design and reproducibility of compressive strength of alkali-activated concretes

et al. 2019

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The aim of RILEM TC 247-DTA ‘Durability Testing of Alkali-Activated Materials’ is to identify and validate methodologies for testing the durability of alkali-activated concretes. To underpin the durability testing work of this committee, five alkali-activated concrete mixes were developed based on blast furnace slag, fly ash, and flash-calcined metakaolin. The concretes were designed with different intended performance levels, aiming to assess the capability of test methods to discriminate between concretes on this basis. A total of fifteen laboratories worldwide participated in this round robin test programme, where all concretes were produced with the same mix designs, from single-source aluminosilicate precursors and locally available aggregates. This paper reports the mix designs tested, and the compressive strength results obtained, including critical insight into reasons for the observed variability in strength within and between laboratories.

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Section: General Remarks and Connected Studiesmentioning

confidence: 99%

RILEM TC 247-DTA round robin test: mix design and reproducibility of compressive strength of alkali-activated concretes

et al. 2019

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“…The highest bond capacity was exhibited by the mix 1G50, as noted in Table 6. The restrained shrinkage effects, being governed by the observed shrinkage cracking and without any observation of debonding, indicate a strong bond, which is in contrast with [2,58] where poor bond of BFS-based mixes with the concrete substrate was observed. Indeed, all specimens in this study failed mainly in the mortar.…”

Section: Restrained Shrinkage and Pull-off Bond Strength Of Mixes Com...mentioning

confidence: 89%

Explorative Study into Alkali-Activated Repair Mortars Using Blast Furnace Slag and Glass Waste

Krajnović,

Komkova,

Barragán

et al. 2024

Sustainability

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The repair of concrete structures is increasing in prevalence. Conventional repair mortars are expensive materials rich in Portland cement (PC) and other organic and inorganic components that question their economic efficiency and carbon footprint. Alkali-activated materials (AAMs) are an eco-friendly alternative to PC that possess properties desirable for repair mortars. The article presents the mix design, mechanical, bond, and shrinkage properties of alkali-activated binary mortars intended for structural concrete repair. Mix optimisation based on mechanical properties of repair mortar and utilisation of glass waste (GW) is presented together with total and restrained shrinkage, pull-off bond tests, and life cycle assessment (LCA) for selected configurations. Results demonstrate good compressive and flexural strength, exceeding 45 N/mm2 and 7 N/mm2, an excellent pull-off bond strength (1.8–2.3 N/mm2) of the alkali-activated mortar to the concrete substrate, in spite of extensive shrinkage, with an order of magnitude of a couple of thousands of microstrains, which is also reported. Shrinkage appears to increase with the increase of the applied GW in the mixture. LCA revealed that alkali-activated mortars have up to 54% lower CO2 eq. emissions compared to PC-based repair mortar.

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“…Similarly, polypropylene fibers have a statistically significant effect on the compressive strength of geopolymers since the p-value is less than 0.05. Therefore, a geopolymer mortar containing polypropylene and bacteria has the potential to be used as a repair mortar with an R2 classification, according to Ducman et al [56] since its compressive strength is at least 15 MPa ranging from 17.03 to 21.59 MPa. According to the European Standard EN 1504-3:2006 [57], which defines the materials that may be used for the preservation and repair of concrete structures, a geopolymer mortar containing polypropylene fiber and bacteria may be used as a non-structural and aesthetic repair.…”

Section: Compressive Strengthmentioning

confidence: 99%

Exploring the Potential of Polypropylene Fibers and Bacterial Co-Culture in Repairing and Strengthening Geopolymer-Based Construction Materials

Griño,

Soriano,

Promentilla

et al. 2023

Buildings

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This study explored self-healing in geopolymer mortar cured at ambient temperature using polypropylene fibers and bacterial co-cultures of Bacillus subtilis and Bacillus megaterium. Damage degree, compressive strength, ultrasonic pulse velocity (UPV), strength-regain percentage, and self-healing percentage were evaluated. A full factorial design was used, which resulted in an eight-run complete factorial design with four levels in the first factor (polypropylene content: 0%, 0.25%, 0.5%, and 0.75%) and two levels in the second factor (bacteria concentration: 0 (without) and 1 (with)). The results indicate that increasing the polypropylene fiber content enhanced strength regains up to 199.97% with 0.75% fibers and bacteria. The bacteria alone improved strength-regain percentages by 11.22% through mineral precipitation. The analysis of variance (ANOVA) showed no interaction between fibers and bacteria, but both independently improved the compressive strength. Only bacterial samples exhibited positive self-healing, ranging from 16.77 to 147.18%. The analysis using a scanning electron microscope with energy dispersive X-ray (SEM-EDX) and X-ray fluorescence (XRF) also revealed greater calcite crystal formation in bacterial samples, increasing the strength-regain and self-healing percentages. The results demonstrate that polypropylene fibers and bacteria cultures could substantially enhance the strength, durability, and self-healing percentage of geopolymer mortars. The findings present the potential of a bio-based self-healing approach for sustainable construction and repair materials.

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Alkali activated repair mortars based on different precursors

Cited by 4 publications

References 58 publications

RILEM TC 247-DTA round robin test: mix design and reproducibility of compressive strength of alkali-activated concretes

RILEM TC 247-DTA round robin test: mix design and reproducibility of compressive strength of alkali-activated concretes

Explorative Study into Alkali-Activated Repair Mortars Using Blast Furnace Slag and Glass Waste

Exploring the Potential of Polypropylene Fibers and Bacterial Co-Culture in Repairing and Strengthening Geopolymer-Based Construction Materials

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