Study on the interaction mechanism between slags and alkali silicate activators: A hydration kinetics approach

Yu, Jin; Feng, Weipeng; Zheng, Dapeng; Dong, Zhijun; Cui, Hongzhi; Li, Mingyu; Sang, Guochen; Tang, Waiching

doi:10.1016/j.conbuildmat.2020.118900

Cited by 16 publications

(4 citation statements)

References 37 publications

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“…The retarding effect of soluble Si on dissolution of slag then slowed down the reaction kinetics of sodium silicate activated slag, resulting in an induction period during the reaction process as shown in Figure 3b. The induction period has been also widely detected through isothermal calorimetry measurements by many studies in the literature [20][21][22][25][26][27][28]. Besides the reaction kinetics, the effect of soluble Si by slowing down the dissolution of slag also affects the microstructure formation.…”

Section: Dissolution Resultsmentioning

confidence: 99%

“…According to the aforementioned calorimetric studies, among others in the literature like [25][26][27][28], an obvious different calorimetric characteristic can be found between the NaOH activated slag paste and the sodium silicate activated slag paste. As shown in Figure 1, the heat evolution rate curve of NaOH activated slag paste demonstrates no induction period, while that of sodium silicate activated slag paste show an obvious induction period.…”

Section: Introductionmentioning

confidence: 99%

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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: Dissolution Resultsmentioning

confidence: 99%

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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“…The chemical composition of GGBFS can affect its chemical activity, hydration, and polymerization process. Jin et al concluded that the reaction performance of GGBFS can be indicated effectively through the ratio of (CaO + MgO)/(SiO 2 + Al 2 O 3 ) 8 Zhu et al investigated the effect of adding CaO to GGBFS on the properties such as fluidity, setting time, and compressive strength of the Alkali Activated Slag (AAS) pastes and mortars, the addition of CaO increased the setting time and fluidity, while the highest compressive strength was achieved by 25% replacement by weight 9 . A recent study performed by Amer et al investigated the effect of adding OPC to GGBFS on the workability and the compressive strength of AAS concrete, the addition of OPC with the GGBFS is not recommended due to the obtained low workability while using GGBFS only achieved the best workability and compressive strength 10 .…”

Section: Introductionmentioning

confidence: 99%

Effect of binder and activator composition on the characteristics of alkali-activated slag-based concrete

Heshmat,

Amer,

Elgabbas

et al. 2024

Sci Rep

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Alkali Activated Slag Concrete (AASC) has been a sustained research activity over the past two decades. Its promising characteristics and being environmentally friendly compared to Ordinary Portland Cement made AASC of exceptional interest. However, there is still no firm mix design, for the AASC, that can provide desirable fresh and hardened properties based on the composition of the binder and activator. This research specifically aims to investigate the affecting parameters on the slump and compressive strength of alkali-activated slag/lime-based concrete and provide a better understanding of the potential reasons for these characteristics. The experimental program consisted of two stages; the first stage studied the effect of different binder and activator compositions, and the second stage studied the water-to-binder ratio and binder content effects on the slump and compressive strength of alkali-activated slag/lime-based concrete. The binder and activator compositions were defined through two main parameters, the hybrid factor (HF = CaO/Si2O + Al2O3) and the solution modulus (Ms = SiO2/Na2O). The compressive strength, initial slump, and slump loss were measured to evaluate the different mixes and specify the optimum range of compositions. Based on the studied parameters, the effective range to achieve desirable slump and concrete compressive strength is from HF 0.6 up to 0.8 at Ms 1.5, this would achieve a compressive strength of more than 30 MPa and a slump of 100 mm after 90 min.

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“…Hybridizing cF with cNT to enhance the interfacial properties of composites has been demanding topic for the last few decades [4][5][6]. currently, several methods have been developed to hybridize cF with cNT, such as chemical vapour deposition (cVD) [7][8][9][10], electrophoretic deposition (ePD) [11][12][13] and chemical functionalization [14][15][16]. While all of these methods are commonly known to have successfully improving interfacial properties of polymer composites, but somehow, there are some drawbacks to each method especially in the reduction of tensile properties of hybrid cF-cNT [17].…”

Section: Introductionmentioning

confidence: 99%

Archives of Metallurgy and Materials

2022

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HierarcHical carbon Fiber-carbon nanotubes by using electrospray Deposition MetHoD witH preserveD tensile propertiesin this study, the electrospray deposition (esD) method was used to deposit carbon nanotubes (cNT) onto the surfaces of carbon fibers (cF) in order to produce hybrid carbon fiber-carbon nanotubes (cF-cNT) which is rarely reported in the past. extreme high-resolution field emission scanning electron microscopy (XHR-FeseM), high-resolution transmission electron microscopy (HRTeM) and x-ray photoelectron spectroscopy (XPs) were used to analyse the hybrid carbon fiber-carbon nanotube (cF-cNT). The results demonstrated that cNT was successfully and homogenously distributed on the cF surface. Hybrid cF-cNT was then prepared and compared with cF without cNT deposition in terms of their tensile properties. statistically, the tensile strength and the tensile modulus of the hybrid cF-cNT were increased by up to 3% and 25%, respectively, as compared to the cF without cNT deposition. The results indicated that the esD method did not cause any reduction of tensile properties of hybrid cF-cNT. based on this finding, it can be prominently identified some new and significant information of interest to researchers and industrialists working on cF based products.

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Study on the interaction mechanism between slags and alkali silicate activators: A hydration kinetics approach

Cited by 16 publications

References 37 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

Effect of binder and activator composition on the characteristics of alkali-activated slag-based concrete

Archives of Metallurgy and Materials

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