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Alkali-activated slag cement without ordinary portland cement (OPC) has received much attention in the view of energy saving and its many excellent properties. Ion concentration change in the liquid during the slag hydration was studied to investigate the hydration process.The ion concentration change of liquid phase during hydration was different …
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Through carbonation, up to 58.83% of MgO in RO phase can be converted into MgCO 3, and the activation of RO phase by carbonation was manifested. The mechanical properties and volume stability of carbonated steel slag were improved, proving that the positive effect of carbonation on steel slag when applied in cement and cementitious materials.
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The slag was supplied by Nanning steel company and its chemical composition tested by X-ray fluorescence (XRF) was given in Table 1.The particle size distribution of slag determined by Mastersizer 3000 laser diffraction was shown in Fig. 1 and its d 50 was 12.8 μm. The activator was liquid sodium silicate provided from Yourui Material Co.,Ltd and its initial modulus n(SiO …
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Figure 1 : Quantity of amine adsorbed in a cement blended with 40 wt% slag at different hydration times in presence of Amine 1 and Amine 2[1] Regarding the hydration kinetics, the addition of 0.1 wt% Amine 1 and Amine 2 inside the slag blended cement significantly modifies the heat flow evolution (Figure 2).
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Title: Impact of OPC-Based Activation on Microstructure of Super Sulphated Slag Cement Author(s): Emmanuel Guillon and Catherine Bouillon Publication: Symposium Paper Volume: 349 Issue: Appears on pages(s): 522-532 Keywords: activation, calorimetry, hydration, low carbon concrete, microstructure development, super sulphated slag cement DOI: …
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slags in cement production, It needs to be taken into account that the chemical activation strongly depends on the chemical and mineralogical composition of the clinker too. The SikaGrind® Slag Booster range is a series of cement strength enhancers. This range of products are intended to be used at cement production level for slag cements or slag
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Several models have been proposed in the literature to evaluate the development of properties of slag-blended concrete. Chen and Brouwers [13] propose reaction models for slag-blended cements. The models developed are based on stoechimetry calculations in order to correlate the chemical compositions of the unhydrated main phases (slag and cement) with …
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Download Citation | Na2SiO4- and Cement- Based Activation on Steel Slag and Its Application in Soft-soil Stabilization | A large amount of steel slag is produced annually in China, but it is not ...
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In the precast industry very early age strength development is crucial for productivity, and it is for this reason that industry has been reluctant to embrace the use of ground granulated blast-furnace slag (GGBS) as a supplementary cementitious material, despite its lower carbon dioxide (CO2) emissions. This paper explores the replacement of different base cements (CEM II A-L …
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The sulfate ions from sulfates would react with Ca 2 + from slag cement and form the reaction product ettringite. However, the addition of sodium hydroxide seems ineffective in …
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The extensive use of slag cement in concrete formulations, spanning well over a century and reaching both the United States and the global arena, stands as a resounding testament to its rich history and unwavering benefits. Contemporary designers, armed with a deep understanding of slag cement's ability to simultaneously enhance concrete ...
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The mutual activation mechanism of the cement–GGBS–SS ternary system mixed with Na 2 SO 4 is summarized in Figure 13. Figure 13 shows that C–S–H gel and C–F–H can be generated by the hydration …
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The properties of slag cement and its influence on the structure of the hardened cement paste. Procedia Eng., 150 (2016), ... Activation of low lime high alumina granulated blast furnace slag by anhydrite. Cem. Concr. Res., 20 (1990), pp. 711-722, 10.1016/0008-8846(90)90005-I.
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: The hydraulic and related properties of Portland-slag cement containing granulated blast furnace slag as high as 40% (w/w) has been examined at room temperature under the mixed activation of gypsum and sodium hexametaphosphate. The study confirmed that the minor dosage of polyelectrolyte, hexametaphosphate with 4% (w/w) gypsum might act as potential …
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Improved processing of blended slag cement through mechanical activation. Published: May 2004; Volume 39, pages 3449–3452, (2004) Cite this article; Download PDF. Journal of …
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with steel slag replacing 15%, 30%, and 45% of the fine aggregate by weight. These proportions are chosen to investigate the effects of incremental increases in steel slag content on the concrete's performance. Following the curing period, the compressive strength of both the control and steel slag-amended concrete samples is
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Alkali-activation kinetics of phosphorus slag cement using compressive strength data Ceramics – Silikáty 59 (3) 250-260 (2015) 251 3) an accurate measurement of the amount of products
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The steel slag pastes were prepared by mixing steel slag with water. The water/steel slag ratio of paste was 0.25. With this ratio BOF slag pastes have normal consistency according to the standard NF EN 196 cement. The activators, except the lime and alumina cement, were added to the batching water for each test with proportions given in Table 5.
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This study aims to improve the mechanical properties of cement-steel slag mortar by the addition of alkaline activators (NaOH, Na 2 CO 3 /NaOH and water glass) to promote the optimal utilization of steel slag. In this paper, the setting time, flexural and compressive strength, early-age hydration kinetics and microstructure are investigated to explore how the alkaline …
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Steel slag powder (SSP), with similar minerals components to cement (Jiang et al., 2018), is potentially practicable as the activator, thus resulting in greener all-solid-waste EPSC.But steel slag is often named the "over-burnt Portland cement clinker" (> 1600 °C) (G et al., 2013), which means it owns coarse crystalline and consequent much lower activity than …
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A large number of studies have shown that the activity of solid wastes such as coal gangue [14], [15], oil shale slag [16], steel slag [17], and various tailing sands [13], [18], [19], [20], are significantly enhanced after thermal activation at a certain temperature, which provides a new possibility for the utilization of such solid wastes ...
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Shan et al. [17] studied slag-copper slag composite cementitious materials and found the activation effects to be: water glass > sodium hydroxide > sodium sulfate > sodium carbonate. Zhao et al. [18] used blast furnace slag as a precursor material and sodium hydroxide and sodium silicate solutions as alkaline activators, resulting in a ...
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Vol. 23, No. 6 HYDRATION, KINETICS, ALKALI ACTIVATION SLAG 1257 40.0 II-HNI X-HN2 &-HN3 ~r-HN4 O-HN5 40°C WIS,,0 A5 S-600 Inlt kg ~.o I._.....~ I" 1 4 I 24 72 168 Time {Hour) Figure 3. None-va .porable water content vs. cunng time Z--" wN2 (ws 2) 1-20"C ~-40"0 3-60"C loo s-soo rr~
The extensive use of slag cement in concrete formulations, spanning well over a century and reaching both the United States and the global arena, stands as a resounding …
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The cement industry contributes approximately 14 % of China's carbon dioxide emissions and becomes a key industry for the building materials industry to achieve carbon peaking/neutrality [1].According to statistics, more than 1.2 billion tons of CO 2 were emitted by cement industry annually in China [2].Low carbon technologies in this field are receiving …
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For the magnesium slag aggregate carbonized for 168 h, the water absorption rate is still as high as 18.1 %. Considering the high water absorption of magnesium slag aggregate, the workability of concrete is tremendously reduced with time [35], [36]. Thus, aggregate pre-wetting is needed during concrete manufacturing.
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The sulphate activation of glassy ground granulated blast-furnace slag (GGBS), such as supersulphated cement (SSC), was investigated. Environmental scanning electron microscope (ESEM) and X-ray diffractometry analyses showed ettringite and C–S–H as the main hydration products of the hardened SSC paste. Changes of the composition of the pore …
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Green alkali-activated lithium slag cement composites (ALC) were formulated by partially substituting OPC with lithium slag and mineral admixtures. An in-depth examination was conducted on the effects of varying calcination temperatures, water-to-cement ratios, NaOH concentrations, and lithium slag dosages on the fluidity and mechanical ...
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20 min optimized ball milled slag and cement binder activated with sodium silicate solution increases slag activity index in order of 65.94% and 72.19% at the age of 7 days and …
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Alkali Activated Slag Concrete (AASC) has been a sustained research activity over the past two decades. ... whereas the activation with Na 2 SiO 3 would lead to higher …
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