Future perspectives for alkali-activated materials: from existing standards to structural applications

Rossi, Laura; Lima, Luiz Miranda de; Sun, Yubo; Dehn, Frank; Provis, John L.; Ye, Guang; Schutter, Geert De

doi:10.21809/rilemtechlett.2022.160

Cited by 16 publications

(3 citation statements)

References 60 publications

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“…where 𝑓 𝑐𝑚 [MPa] is the compressive strength at 28 days, 𝐸 𝑐0 = 21.5 • 10 −3 MPa and 𝛼 𝐸 is a coefficient accounting for different types of aggregate (𝛼 𝐸 = 1.0 for quartzite aggregates). However, this equation overestimates Young's modulus of AAS concrete as shown in [14].…”

Section: Introductionmentioning

confidence: 96%

Multi‐scale modeling for the prediction of Young's modulus of alkali‐activated slag concrete

Caron,

Patel,

Dehn

2023

ce papers

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Alkali‐activated slag is an alternative to ordinary Portland cement that can be used for structural applications. Young's modulus is an important property to predict stress or strains in concrete. However, the fib Model Code 2010 overestimates it for alkali‐activated slag concrete. Multi‐scale models allow the determination of concrete property from the features of the microstructure. In this study, an analytical micromechanics‐based multi‐scale homogenization model is applied to predict Young's modulus of alkali‐activated slag. It is compared to experimental results found in the literature on paste, mortar and concrete. Better predictions of Young's modulus are achieved from multiscale models compared to the fib MC 2010. Accuracy could be enhanced by improving the predictions for the degree of activation of slag for the different mixes.

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Section: Introductionmentioning

confidence: 96%

Multi‐scale modeling for the prediction of Young's modulus of alkali‐activated slag concrete

Caron,

Patel,

Dehn

2023

ce papers

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“…Ultra-high performance geopolymer concrete (UHPGPC) has advanced in the last decade [ 16 , 17 ]. It is a new type of concrete with good compression, indirect tensile strength, a high proportion of binding material, and also lower water-to-binder ratio (w/b) [ 18 , 19 ]. UHPGPC has materials that are small/fine in size to achieve proper dense concrete [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Determining engineering properties of ultra-high-performance fiber-reinforced geopolymer concrete modified with different waste materials

Althoey

Zaid²,

Alsulamy

et al. 2023

PLoS ONE

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Reprocessing solid waste materials is a low-cost method of preserving the environment, conserving natural resources, and reducing raw material consumption. Developing ultra-high-performance concrete materials requires an immense quantity of natural raw materials. The current study seeks to tackle this issue by evaluating the effect of various discarded materials, waste glass (GW), marble waste (MW), and waste rubber powder (WRP) as a partial replacement of fine aggregates on the engineering properties of sustainable ultra-high-performance fiber-reinforced geopolymer concrete (UHPGPC). Ten different mixtures were developed as a partial substitute for fine aggregate, each containing 2% double-hooked end steel fibers, 5%, 10%, and 15% GW, MW, and WRP. The present study assessed the fresh, mechanical, and durability properties of UHPGPC. In addition, to evaluate concrete development at the microscopic level due to the addition of GW, MW, and WRP. Spectra of X-ray diffraction (XRD), thermogravimetric analysis (TGA), and mercury intrusion (MIP) tests were conducted. The test results were compared to current trends and procedures identified in the literature. According to the study, adding 15% marble waste and 15% waste rubber powder reduced ultra-high-performance geopolymer concrete’s strength, durability, and microstructure properties. Even so, adding glass waste improved the properties, as the sample with 15% GW had the highest compressive strength of 179 MPa after 90 days. Furthermore, incorporating glass waste into the UHPGPC resulted in a good reaction between the geopolymerization gel and the waste glass particles, enhancing strength properties and a packed microstructure. The inclusion of glass waste in the mix resulted in the control of crystal-shaped humps of quartz and calcite, according to XRD spectra. During the TGA analysis, the UHPGPC with 15% glass waste had the minimum weight loss (5.64%) compared to other modified samples.

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“…The most promising ones in this direction are alkali-activated cement and concrete [7][8][9]. This is due to a complex of special properties, though their potential has not yet been fully determined.…”

Section: Introductionmentioning

confidence: 99%

Influence of Dosage and Modulus on Soluble Sodium Silicate for Early Strength Development of Alkali-Activated Slag Cements

Kryvenko,

Rudenko,

Kovalchuk

et al. 2023

Minerals

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In world practice, the need for high-strength concrete with an intensive gain of early strength is due to an increase in requirements for characteristics of concrete and the desire to shorten the construction period. Alkali-activated cement, based on soluble sodium silicates (SSS), can demonstrate high strength and rapid gain due to the nano-modifying effect of amorphous silica present in SSS. However, the problem with the effective use of such cement compositions is unsatisfactory short setting times. This work investigates the effect of modifying admixtures on the structure formation of alkali-activated slag cement (AASC), its physical and mechanical properties depending on characteristics of SSS and the basicity of the aluminosilicate component (precursor), which was changed by the ratio of the ordinary Portland cement (OPC) clinker and granulated blast furnace slag (GBFS). A positive synergistic effect was noticed from glycerol and trisodium phosphate, as the components of a complex admixture, to control the setting of AASC. This resulted in extending the initial setting time from 1 to 5 min to the values of 21–72 min. The compressive strength of 21–26.3 MPa by 3 h, 36.5–43.4 MPa by 1 day, and 84.7–117.1 MPa by 28 days was obtained. Proper shrinkage deformations were equal to 0.47–0.6 mm/m. It was shown that with an increase in the basicity of the aluminosilicate component, the properties of AASC increased both in the early and late stages of hardening.

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Future perspectives for alkali-activated materials: from existing standards to structural applications

Cited by 16 publications

References 60 publications

Multi‐scale modeling for the prediction of Young's modulus of alkali‐activated slag concrete

Multi‐scale modeling for the prediction of Young's modulus of alkali‐activated slag concrete

Determining engineering properties of ultra-high-performance fiber-reinforced geopolymer concrete modified with different waste materials

Influence of Dosage and Modulus on Soluble Sodium Silicate for Early Strength Development of Alkali-Activated Slag Cements

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