A review: Reaction mechanism and strength of slag and fly ash-based alkali-activated materials

Sun, Beibei; Ye, Guang; Schutter, Geert De

doi:10.1016/j.conbuildmat.2022.126843

Cited by 163 publications

(41 citation statements)

References 162 publications

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“…The bond behaviour of both fibre types, stainless-steel (SSF) and brass-coated steel (SF), which was determined by straight multiple-fibre pullout tests, revealed a good bond behaviour to the AAM-UHPC matrix. In comparison to the UHPC based on the OPC [ 4 ], higher maximum bond stresses were determined by both fibre types in the adhesive and frictional bond, resulting in a higher dissipated energy and utilization rate. The difference between the PC-based and the AAM-based systems is comparable to results reported elsewhere [ 22 , 23 ].…”

Section: Discussionmentioning

confidence: 99%

“…Anyhow, the aim is to lower these footprints further by optimizing the composition. Alkali-activated material is based on alumo-silicatic precursors, most times slags, fly ashes, or metakaolin and an activator, usually alkali-waterglass or alkali-hydroxide [ 3 , 4 , 5 ]. In prior work, it was reported that it is possible to produce a UHPC without Portland cement by using alkali-activated slag [ 6 ].…”

Section: Introductionmentioning

confidence: 99%

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Bonding Behaviour of Steel Fibres in UHPFRC Based on Alkali-Activated Slag

et al. 2022

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The mechanical performance of fibre-reinforced ultra-high-performance concrete based on alkali-activated slag was investigated, concentrating on the use of steel fibres. The flexural strength is slightly higher compared to the UHPC based on Ordinary Portland Cement (OPC) as the binder. Correlating the flexural strength test with multiple fibre-pullout tests, an increase in the bonding behaviour at the interfacial-transition zone of the AAM-UHPC was found compared to the OPC-UHPC. Microstructural investigations on the fibres after storage in an artificial pore solution and a potassium waterglass indicated a dissolution of the metallic surface. This occurred more strongly with the potassium waterglass, which was used as an activator solution in the case of the AAM-UHPC. From this, it can be assumed that the stronger bond results from this initial etching for steel fibres in the AAM-UHPC compared to the OPC-UHPC. The difference in the bond strength of both fibre types, the brass-coated steel fibres and the stainless-steel fibres, was rather low for the AAM-UHPC compared to the OPC-UHPC.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Bonding Behaviour of Steel Fibres in UHPFRC Based on Alkali-Activated Slag

et al. 2022

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“…Compared with conventional ordinary Portland cement, AAS binder has excellent properties such as low hydration heat release, low carbon emission [6], high early strength [7,8], and good durability [9][10][11]. However, due to the restrictive factors such as high shrinkage [12][13][14], short setting time [15,16], and later strength recession [17,18], AAS binder has not been widely used in practical engineering. Therefore, it is crucial to adopt appropriate materials and methods to improve the volume stability of AAS materials.…”

Section: Introductionmentioning

confidence: 99%

Effect of Rice Husk Ash on the Properties of Alkali-Activated Slag Pastes: Shrinkage, Hydration and Mechanical Property

Tian

et al. 2023

Materials

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In this paper, rice husk ash (RHA) with different average pore diameters and specific surface areas was used to replace 10% slag in the preparation of alkali-activated slag (AAS) pastes. The effect of RHA addition on the shrinkage, hydration, and strength of AAS pastes was studied. The results show that RHA with a porous structure will pre-absorb part of the mixing water during paste preparation, resulting in a decrease in the fluidity of AAS pastes by 5–20 mm. RHA has a significant inhibitory effect on the shrinkage of AAS pastes. The autogenous shrinkage of AAS pastes decreases by 18–55% at 7 days, and the drying shrinkage decreases by 7–18% at 28 days. This shrinkage reduction effect weakens with the decrease in RHA particle size. RHA has no obvious effect on the type of hydration products of AAS pastes, whereas RHA after proper grinding treatment can significantly improve the hydration degree. Therefore, more hydration products are generated and fills the internal pores of the pastes, which significantly improves the mechanical properties of the AAS pastes. The 28 day compressive strength of sample R10M30 (the content of RHA is 10%, RHA milling time is 30 min) is 13 MPa higher than that of blank sample.

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“…By adding the right amount of water and sand, stone, or fiber material, these materials become a plastic slurry after mixing, and can condense in air or water into a solid gel material form that has certain mechanical strength. These materials have many advantages, such as high early strength, fire resistance, corrosion resistance, impermeability and frost resistance, and strong bonding with old concrete [ 3 , 4 , 5 , 6 , 7 ]. Adding alkali-activated cementitious materials to concrete can reduce natural resource consumption, CO 2 emissions, and energy consumption [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Strength Characteristics and Microstructure Analysis of Alkali-Activated Slag–Fly Ash Cementitious Material

Zhu

Wan²,

Wang

et al. 2022

Materials

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Modifying the admixture of alkali-activated cementitious materials using components such as fly ash and fine sand may reduce CO2 emissions and conserve natural resources and energy. This study adopted strength testing, scanning electron microscopy, and mercury intrusion porosimetry to investigate the influence of different admixtures on the compressive strength and flexural strength of alkali slag cementing materials and the microstructure characteristics of hardened slurry under the action of load. The flexural strength of alkali slag cement slurry and mortar was reduced by replacing slag powder with fly ash. Content of fine sand less than 20% had little effect on the strength of alkali slag cement mortar; however, when the content of fine sand exceeded 30%, the strength decreased significantly. The hydration degree at 3 d was large, and the density of slurry increased with the extension of age. Increased fly ash or fine sand content decreased the density of the slurry, and increased fly ash resulted in a large number of unhydrated fly ash particles in the cementitious materials. Addition of fine sand resulted in a large number of microcracks in the slurry, which gradually decreased with the extension of hydration age.

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A review: Reaction mechanism and strength of slag and fly ash-based alkali-activated materials

Cited by 163 publications

References 162 publications

Bonding Behaviour of Steel Fibres in UHPFRC Based on Alkali-Activated Slag

Bonding Behaviour of Steel Fibres in UHPFRC Based on Alkali-Activated Slag

Effect of Rice Husk Ash on the Properties of Alkali-Activated Slag Pastes: Shrinkage, Hydration and Mechanical Property

Strength Characteristics and Microstructure Analysis of Alkali-Activated Slag–Fly Ash Cementitious Material

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