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Sodium carbonate activated slag as cement replacement

2021-5-21  In this case, sodium carbonate activation is preferable for the production of AAC by totally substituting the cement. In fact, sodium carbonate was used as accelerator in producing AAC [4] and slag as quartz replacement in the patent of Eriksson [41]. In this study, sodium carbonate activated slag

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Sodium carbonate activated slag as cement

This paper aims to study the suitability of fully replacing cement by sodium carbonate activated slag in producing autoclaved aerated concrete (AAC). The material properties of the product are characterized in terms of green strength development, mechanical properties, pore related properties such as porosity and thermal conductivity, shrinkage and reaction products.

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Performance and sustainability overview of sodium ...

2021-3-1  Sodium carbonate activation of slag Slag is activated by using an alkali media to dissolve the aluminate, silicate and calcium monomers in the slag to form a calcium aluminate silicate hydrate (C-A-S-H) (Brough and Atkinson, 2002). The corresponding product formed (i.e. C-A-S-H) possesses outstanding mechanical and durability properties.

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武汉理工大学材料科学与工程学院欢迎您

2020-5-26  Sodium carbonate activated slag as cement replacement in autoclaved aerated concrete. Ceramics International, 43(8), 6039-6047. 8. Yuan, B., Yu,

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Ultra-fine slag activated by sodium carbonate at

2020-12-20  In the present study, ultra-fine slag (D50 = 8.1 μm, 4.3 μm, and 3.1 μm) was activated by sodium carbonate (2%, 4%, and 6% Na 2 O-E) at ambient temperature, and the main conclusions were drawn as follows. (1) Owing to the high reactivity of ultra-fine particles, slag was efficiently activated by NC at ambient temperature.

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武汉大学土木建筑工程学院

2021-6-30  Sodium carbonate activated slag as cement replacement in autoclaved aerated concrete. Ceramics International, 43, 193-201. [69] Gao, X., Yuan, B.,

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Performance of green fibre-reinforced composite

2020-5-2  The slag was activated with sodium carbonate at 8% of the binder composition. Silica sand with a maximum aggregate size of 250 µm was used as aggregate. Polyvinyl alcohol (PVA) fibre with properties presented in Table 2 was used to reinforce the composite at 2% the volume of the mixture.

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Chloride binding and mobility in sodium carbonate ...

2017-12-21  capacity and the migration of chloride in sodium carbonate-activated slag cements and mortars. The effect on chloride mobility and binding of adding a calcined layered double hydroxide (CLDH) to the binder mix was also assessed. Significantly improved durability characteristics can be achieved for sodium carbonate-activated slag mortars by the addition of

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Development of greener alkali-activated cement ...

2016-2-1  Alkali activated fly ash/slag (AAFS), a newly evolved type of alkali-activated cements (AACs), is here studied with the aim of developing a more sustainable alternative to Portland cement (PC), known for its adverse environmental impact. In this study, sodium carbonate (Na2 CO 3) was used as the alkali activator for the fly ash (FA)/slag blends.

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Blast furnace slag-Mg(OH) 2 cements activated by

First published on 26th June 2018. The structural evolution of a sodium carbonate activated slag cement blended with varying quantities of Mg(OH) 2 was assessed. The main reaction products of these blended cements were a calcium-sodium

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Blast furnace slag-Mg(OH)2 cements activated by

2018-6-26  The structural evolution of a sodium carbonate activated slag cement blended with varying quantities of Mg(OH) 2 was assessed. The main reaction products of these blended cements were a calcium-sodium aluminosilicate hydrate type gel, an Mg-Al layered double hydroxide with a hydrotalcite type structure, calcite, and a hydrous calcium aluminate phase (tentatively identified as a carbonate ...

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Mechanical Properties of Na2CO3-Activated High

2018-6-25  Abstract. The use of Na 2 CO 3 to improve the mechanical properties of high-volume slag cement (HVSC) is experimentally investigated in this study. Ordinary Portland cement (OPC) was replaced with 50, 60, 70, 80, and 90% ground-granulated blast-furnace slag (GGBFS) by weight.

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Microstructure and Strength Development of Sodium ...

Sodium carbonate replacement with sodium hydroxide and the presence of calcium hydroxide in the binder as a replacement for the slag enhances the rate of dissolution of slag, leading to faster strength development. Calcium hydroxide significantly increases the compressive strength, even at an early age.

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Mechanical, Environmental and Economic Feasibility ...

2020-10-13  - Alkali- Activated Concrete . SCABFS - Sodium Carbonate Activated Blast Furnace Slag (in this study it is used to refer to sodium carbonate activated ground granulated blast furnace slag) BFS - Blast Furnace Slag . GGBFS - Ground Granulated Blast Furnace Slag . Na. 2. CO. 3 - Sodium carbonate also referred to as soda ash. In the experimental ...

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Microstructure and Strength Development of Sodium ...

2020-2-27  development in sodium carbonate activated slags as a function of the nature of the alkaline activator. The purpose was to explore the strength gain mechanism of sodium carbonate activated slag mixes at room temperature curing. To enhance both early and ultimate compressive strength, different accelerators were used.

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Influence of various additives on the early age ...

The use of sodium carbonate as an alkali activator for slag to produce alkali-activated slag is promising due to its sustainable, economic and user-friendly properties. However, the lower early age performance of composites made with such binder has limited its use especially in applications where higher early age is required. Hence, in order to propel the application of this sustainable ...

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Chemical acceleration of a neutral granulated blast ...

2016-10-20  furnace slag activated using sodium carbonate. As strength development of alkali-activated slag cements containing neutral GBFS and sodium carbonate as activator at room temperature is known to be slow, three accelerators were investigated: sodium hydroxide, ordinary Portland cement and a combination of silica fume and slaked lime.

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Cementitious property of NaAlO 2 -activated Ge slag

2019-5-30  Germanium (Ge), a waste residue leaching from zinc (Zn) smelting process, has potential cementitious properties and could be recycled as a cement supplement activated by chemical reagents. In this work, a test was conducted to determine the hydration properties of Ge slag-cement-based composites with Ge slag (GS)/ordinary Portland cement (PC) contents of 0wt%, 5wt%, 10wt%,

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Characterisation of reactive magnesia and sodium

2017-2-26  1 1 Characterisation of reactive magnesia and sodium carbonate-activated fly 2 ash/slag paste blends 3 Ahmed F. Abdalqader, Fei Jin*, Abir Al-Tabbaa 4 5 6 Ahmed F. Abdalqader: PhD candidate, Department of Engineering, University of Cambridge, Trumpington Road, Cambridge CB2 1PZ, United Kingdom7 8 Fei Jin: Research Associate, Department of Engineering, University of

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Microstructure and Strength Development of Sodium ...

Sodium carbonate replacement with sodium hydroxide and the presence of calcium hydroxide in the binder as a replacement for the slag enhances the rate of dissolution of slag, leading to faster strength development. Calcium hydroxide significantly increases the compressive strength, even at an early age.

Get price

Microstructure and Strength Development of Sodium ...

2020-2-27  development in sodium carbonate activated slags as a function of the nature of the alkaline activator. The purpose was to explore the strength gain mechanism of sodium carbonate activated slag mixes at room temperature curing. To enhance both early and ultimate compressive strength, different accelerators were used.

Get price

Mechanical, Environmental and Economic Feasibility ...

2020-10-13  - Alkali- Activated Concrete . SCABFS - Sodium Carbonate Activated Blast Furnace Slag (in this study it is used to refer to sodium carbonate activated ground granulated blast furnace slag) BFS - Blast Furnace Slag . GGBFS - Ground Granulated Blast Furnace Slag . Na. 2. CO. 3 - Sodium carbonate also referred to as soda ash. In the experimental ...

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International Journal of Innovative Research in Science ...

2019-7-12  Sodium silicate, sodium hydroxide activated slag mixes sets very quickly. AAS concrete is much more sensitive to curing where if there is no addition of retarder (hydrated lime) to the mix. Among AAS mix sodium silicate was the best; sodium carbonate was the second; and sodium hydroxide was third in terms of compressive, split tensile strengths

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Creep and Long-Term Properties of Alkali-Activated

The use of blast furnace slag (BFS) for the production of concrete is one of those alternatives. In this study, pastes and concretes based on high-MgO BFS were alkali activated with 10% by weight sodium carbonate, sodium silicate, and a combination of both. Heat treatment and laboratory curing were applied.

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Chemical acceleration of a neutral granulated blast ...

2016-10-20  furnace slag activated using sodium carbonate. As strength development of alkali-activated slag cements containing neutral GBFS and sodium carbonate as activator at room temperature is known to be slow, three accelerators were investigated: sodium hydroxide, ordinary Portland cement and a combination of silica fume and slaked lime.

Get price

Cementitious property of NaAlO 2 -activated Ge slag

2019-5-30  Germanium (Ge), a waste residue leaching from zinc (Zn) smelting process, has potential cementitious properties and could be recycled as a cement supplement activated by chemical reagents. In this work, a test was conducted to determine the hydration properties of Ge slag-cement-based composites with Ge slag (GS)/ordinary Portland cement (PC) contents of 0wt%, 5wt%, 10wt%,

Get price

Characterisation of reactive magnesia and sodium

2017-2-26  1 1 Characterisation of reactive magnesia and sodium carbonate-activated fly 2 ash/slag paste blends 3 Ahmed F. Abdalqader, Fei Jin*, Abir Al-Tabbaa 4 5 6 Ahmed F. Abdalqader: PhD candidate, Department of Engineering, University of Cambridge, Trumpington Road, Cambridge CB2 1PZ, United Kingdom7 8 Fei Jin: Research Associate, Department of Engineering, University of

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Advances in near-neutral salts activation of blast furnace ...

2019-11-24  high performance alkali -activated slag materials. Alkali-activation of slags is achievable using, as sole also activator, mildly alkaline solutions based on sodium carbonate (Na 2 CO 3) or sodium sulfate (Na 2 SO 4) [22, 23]. Sodium carbonate can be obtained from mined trona, and also via the Solvay process 24], while sodium sulfate is

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ALKALI ACTIVATED MATERIALS: REVIEW OF CURRENT

2018-11-5  slag as aluminosilicate precursors, and activated with sodium silicate [14, 15]. Formation of gel that is rich in silica has been attributed to the high shrinkage in slag activated with sodium silicate [16, 17]. As the rich silica gel loses moisture during drying, it causes microcracks within the AAS paste.

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