Phase evolution and performance of sodium sulfate-activated slag cement …
Alkali-activated cements are alternative low-carbon materials, with the potential to provide 30–80 % CO 2 emissions savings compared to Portland cement, depending on their mix design and curing conditions adopted [6].Chemical activation of slag can be carried out using conventional alkaline solutions such as alkali hydroxides, silicates, or near-neutral salts, and these binder …
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A review on alkali-activated slag concrete
1990 Wu et al. Activation of slag cement. [44] 1991 Roy and Silsbee An overview on alkali-activated cements. [45] 1992 Palomo and Glasser Metakaolin with CBC. [46] 1993 Roy and Malek Slag cement ...
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Activation of Slag as Partial Replacement of Cement Mortar: Effects …
With perspective to the precast industry, this paper is a study of superfine (SF) ground granulated blast-furnace slag (GGBS) as replacement (0%, 30%, 50%, and 70%) of rapid-hardening cement (CEM 1 42.5R) under two types of activation, namely discrete temperature activation (20°C–35°C for 16 h) and two accelerating admixtures.
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Development of newer composite cement through mechano-chemical
Mechano-chemical activation of slag significantly enhances the slag activity index. Sodium silicate and sodium sulphates increases compressive strength by 12.6% and 2.6% respectively as compared to control specimens.
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Mutual Activation Mechanism of Cement–GGBS–Steel Slag
To promote the large-scale recycling of solid waste, the hydration characteristics of blended cement with different amounts of GGBS (ground granulated blast-furnace slag) and SS (steel slag) were investigated.
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Selectivity of Alkaline Activators for the Activation of Slags
Abstract. Ground-granulated blast-furnace slag is being used increasingly as a replacement of portland cement in concrete. A review of literature and results from experimentation show that alkaline activators have selectivity; that is, different activators have variable activation effects on slags from different origins. Analysis of hydration chemistry …
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Activation of slag in blended cement
Blended with Portland cement, slag can be activated with a relatively high pH solution of blend system caused by the hydration phase CH, which is one of the main hydration products of C 3 S and C 2 S in Portland cement. slag has been successfully used with Portland cement to produce blended cements. As soon as water is added into the slag and ...
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(PDF) Alkali-Activation of Slag Cements: Activation …
For this reason, the aim of the present study was to raise the early age mechanical strength of slag cements CEM III (EN 197-1) through alkali activation. The activation process, hydration...
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Early activation and properties of slag cement
It is Vol. 20, No. 6 SLAG CEMENT. ACTIVATION, ALKALIES, SULFATE, ALUMINATE 965 probable that excess additives will generate extra expense, and may be harmful to the later age properties of the concrete. The flow values in Table 5 were measured by the flow table test according to ASTM C 109 and C 230. As slag particles exhibit higher negative ...
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An eco-friendly and low-cost superhydrophobic alkali …
It mainly forms through the alkali activation of industrial by-products. Among them, alkali-activated slag cement (AASC) demonstrates benefits such as rapid setting, high strength, frost resistance [36], high-temperature resistance [37], and corrosion resistance [38]. Despite the significant potential of AASC, it still presents certain challenges.
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Development of newer composite cement through mechano …
Mechano-chemical activation of slag significantly enhances the slag activity index. Sodium silicate and sodium sulphates increases compressive strength by 12.6% and 2.6% …
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Synthesis and Morphology of Slag-based Alkali-Activated …
The high amorphous content of slag (appr. 98 wt.%) will therefore have a similar composition as the bulk presented in Table 1.The slag thus provides a large fraction of …
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The role of calcium stearate on regulating activation to form …
Ground granulated blast-furnace slag (GGBFS) from Chongqing Iron and Steel Company was used to prepare AAS specimens. After grounding in a ball mill and vibromill, the GGBFS has the specific area of 505 m 2 /kg (Blaine fineness) and the density of 2.95 g/cm 3.The PC confirming to the Chinese National Standard GB175-2007 [26] was used to manufacture …
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(PDF) Alkali-Activation of Slag Cements: Activation Process
For this reason, the aim of the present study was to raise the early age mechanical strength of slag cements CEM III (EN 197-1) through alkali activation. The activation process, hydration...
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(PDF) Alkali-Activated Slag Cement Concrete: A closer look …
The alkaline activation of sole slag (i.e., without fly ash incorporation), FA-F, FA-C, or fly ash-slag blends as novel binders have gained significant attention recently since contemporary ...
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Activator Anion Influences the Nanostructure of Alkali-Activated Slag
Modern alkali-activated slag cements exhibit desirable mechanical performance, up to 80% reduction in life cycle CO 2 emissions compared to ordinary Portland cement, and are increasingly applied in the production of concrete.
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Effect of Activator Type on the High-Temperature Properties …
The type of activator has a significant impact on the performance of alkali-activated slag, and there is little research on the effect of activator type on the high-temperature performance of alkali-activated slag. The effects of activator type on the thickening time, compressive strength, and rheological properties of alkali-activated slag under a high …
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Chemical activation of slag-blended Portland cement
This work presents chemical activation of blast-furnace slag-blended Portland cement. For this purpose, a number of different chemical activators and two different quality improvers including Triisopropanolamine (TIPA) and Triethanolamine (TEA) were utilized.
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Development of newer composite cement through mechano-chemical
The aim of present paper is to develop a composite cementitious binder by improving reactivity of Linz Donawitz (LD) slag through mechano-chemical activation. The pozzolanic reactivity of LD slag has been significantly improved as corroborated through modified Chapelle test and slag activity index.
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Fresh and Hardened Properties of Portland Cement-Slag …
This experimental research investigated the applicability of the liquid crystal display (LCD) by-product of the refining process as a sustainable and alternative alkali …
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Activator Anion Influences the Nanostructure of …
Modern alkali-activated slag cements exhibit desirable mechanical performance, up to 80% reduction in life cycle CO 2 emissions compared to ordinary Portland cement, and are increasingly applied in the production of …
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Mutual Activation Mechanism of …
To promote the large-scale recycling of solid waste, the hydration characteristics of blended cement with different amounts of GGBS (ground granulated blast-furnace slag) and SS (steel slag) were investigated.
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Liquid concentration changes during slag cement hydration …
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 depending on the …
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Chemical activation of binary slag cement with low carbon footprint
The primary object of this fundamental research will be to reveal the effect of various chemical activators (Na 2 SO 4, Na 2 CO 3, Na 2 SiO 3 and NaOH) on the mechanical and hydration properties of binary slag cement (50% OPC and 50% BFS). Setting time, compressive strength, hydration heat, phase assemble, and pore size structure were …
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Fresh and Hardened Properties of Portland Cement-Slag Concrete
This experimental research investigated the applicability of the liquid crystal display (LCD) by-product of the refining process as a sustainable and alternative alkali activator for ground granulated blast-furnace slag (GGBFS) blended cement concrete.
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Effect of Activator Type on the High-Temperature Properties …
The type of activator has a significant impact on the performance of alkali-activated slag, and there is little research on the effect of activator type on the high-temperature …
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Synthesis and Morphology of Slag-based Alkali-Activated …
The high amorphous content of slag (appr. 98 wt.%) will therefore have a similar composition as the bulk presented in Table 1.The slag thus provides a large fraction of reactive Si, Al, Fe, and Ca, indicating that it has a large potential for alkali activation [34, 35].The speciation of iron in this amorphous phase is expected to be Fe 2+ due to the atmospheric conditions …
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Early activation and properties of slag cement
Early age activation of granulated blast-furnace slag (BFS) and blends of slag and portland cement (OPC) has been studied. Activators include sodium-hydroxide, sodium …
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Early activation and properties of slag cement
Early age activation of granulated blast-furnace slag (BFS) and blends of slag and portland cement (OPC) has been studied. Activators include sodium-hydroxide, sodium sulfate, alum (potassium aluminum sulfate), superplasticizer, and calcium aluminate cement.
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Characterisation of alkali-activated stainless steel slag and …
Alkali activation may also provide a fundamental route for the immobilisation of heavy metal-containing wastes originating from metallurgical processes [9, 10], including stainless steel production.Stainless steel slags are generated in considerable volumes, up to about 300–400 kg of slags for each tonne of stainless steel produced [11, 12], and are classified …
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