A critical review on application of alkali activated slag as a sustainable composite binder

Awoyera, Paul O.; Adesina, Adeyemi

doi:10.1016/j.cscm.2019.e00268

Cited by 107 publications

(90 citation statements)

References 106 publications

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“…The technology of alkali activation of ground granulated blast furnace slag (GGBFS) has been increasingly used for producing a clinker-free cementitious material, since it is able to efficiently improve the sustainability of concrete production [1][2][3][4]. Awoyera and Adesina reviewed the application of alkali-activated slag in the view point of its sustainability and summarized that alkali-activated slag cement contributes to achieve a greener concrete, taking off the strain on exploration of natural resources for ordinary Portland cement (OPC) production and preventing not only environmental degradation due to the exploration but also contamination due to the disposal of slag [5]. The alkali-activated slag cement has the ability to address the energy and environmental concerns that are associated with OPC production.…”

Section: Introductionmentioning

confidence: 99%

Preliminary Interpretation of the Induction Period in Hydration of Sodium Hydroxide/Silicate Activated Slag

Zuo

2020

Materials

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Many calorimetric studies have been carried out to investigate the reaction process of alkali-activated slag paste. However, the origin of the induction period and action mechanism of soluble Si in the dissolution of slag are still not clear. Moreover, the mechanisms behind different reaction periods are not well described. In this study, the reaction kinetics of alkali-activated slag paste was monitored by isothermal calorimetry and the effect of soluble Si was investigated through a dissolution test. The results showed that occurrence of the induction period in hydration of alkali-activated slag paste depended on the presence of soluble Si in alkaline activator and the soluble Si slowed down the dissolution of slag. A dissolution theory-based mechanism was introduced and applied to the dissolution of slag, showing good interpretation of the action mechanism of soluble Si. With this dissolution theory-based mechanism, origin of the induction period in hydration of alkali-activated slag was explicitly interpreted.

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Section: Introductionmentioning

confidence: 99%

Preliminary Interpretation of the Induction Period in Hydration of Sodium Hydroxide/Silicate Activated Slag

Zuo

2020

Materials

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“…Alkali-activated slag cement (further, AASC) are the most perspective environmentally friendly one in view of the modern tendencies of sustainable development. The ecological benefits of AASC's are caused by reduction of CO2 emission while consumption of byproducts as well as waste products [5,6,7]. AASC mortars and concretes are characterized by increased strength [8,9], heat resistance [10,11], corrosion resistance [12,13], freeze-thaw resistance [14,15] and waterproof [16] in comparison with analogues based on traditional clinker cements.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of alkali-activated slag cement concretes crack resistance for mitigation of steel reinforcement corrosion

et al. 2020

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The paper is devoted to mitigation of steel reinforcement corrosion in alkali-activated slag cement (further, AASC) concretes, based on soluble sodium silicates (further, SSS's), obtained from high consistensy concrete mixes. Enhancement of AASC fine concretes crack resistance due to modification by complex shrinkage-reducing additives (further, SRA's) based on surfactants and trisodium phosphate Na3PO4 . 12H2O (further, TSP) was proposed for mitigation of steel reinforcement corrosion. SSS's were presented by sodium metasilicate (silica modulus 1.0, dry state) and water glass (silica modulus 2.9, density 1400 kg/m 3 ). In case of sodium metasilicate the application of SRA composition "ordinary portland cement clinker -TSP -sodium lignosulphonate -sodium gluconate" provides enhancement of crack resistance starting from early age structure formation with restriction of drying shrinkage from 0,984 to 0,713 mm/m after 80 d. The effect is caused by reduction of water and by higher volume of crystalline hydrates. In turn, SRA presented by compositions "TSP -glycerol" and "TSP -glycerol -polyacrylamide" provide enhancement of AASC fine concretes fracture toughness during late structure formation with increasing ratio of tensile strength in bending to compressive strength up to 37 -49 % if compare with the reference AASC when water glass is used.

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“…As a basic building material, concrete has greatly promoted the development of the construction industry, and it will continue to be in demand far into the future [ 1 , 2 ]. However, the Portland cement industry is known to be a consumer of large amounts of energy (3100–3600 kJ/kg) [ 3 ], and the production of one ton of ordinary Portland cement (OPC) will release about one ton of CO 2 , which is not friendly to the environment and biodiversity [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Internal Curing by Super Absorbent Polymer on the Autogenous Shrinkage of Alkali-Activated Slag Mortars

Wang

Chen

et al. 2020

Materials

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Alkali activated slag (AAS) mortar is becoming an increasingly popular green building material because of its excellent engineering properties and low CO2 emissions, promising to replace ordinary Portland cement (OPC) mortar. However, AAS’s high shrinkage and short setting time are the important reasons to limit its wide application in engineering. This paper was conducted to investigate the effect of internal curing(IC) by super absorbent polymer (SAP) on the autogenous shrinkage of AAS mortars. For this, an experimental study was carried out to evaluate the effect of SAP dosage on the setting time, autogenous shrinkage, compressive strength, microstructure, and pore structure. The SAP were incorporated at different dosage of 0, 0.05, 0.1, 0.2, 0.3, 0.4, and 0.5 percent by weight of slag. The workability, physical (porosity), mechanical, and shrinkage properties of the mortars were evaluated, and a complementary study on microstructure was made. The results indicated that the setting time increased with an increase of SAP dosage due to the additional activator released by SAP. Autogenous shrinkage decreased with an increase of SAP dosage, and was mitigated completely when the dosage of SAP ≥ 0.2% wt of slag. Although IC by means of SAP reduced the compressive strength, this reduction (23% at 56 days for 0.2% SAP) was acceptable given the important role that it played on mitigating autogenous shrinkage. In the research, the 0.2% SAP dosage was the optimal content. The results can provide data and basis for practical application of AAS mortar.

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A critical review on application of alkali activated slag as a sustainable composite binder

Cited by 107 publications

References 106 publications

Preliminary Interpretation of the Induction Period in Hydration of Sodium Hydroxide/Silicate Activated Slag

Preliminary Interpretation of the Induction Period in Hydration of Sodium Hydroxide/Silicate Activated Slag

Enhancement of alkali-activated slag cement concretes crack resistance for mitigation of steel reinforcement corrosion

Effect of Internal Curing by Super Absorbent Polymer on the Autogenous Shrinkage of Alkali-Activated Slag Mortars

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