sodium carbonate activated slag as cement replacement in

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Sodium carbonate activated slag as cement replacement in ...

2017-6-1  The dosage of sodium carbonate (expressed as equivalent Na 2 O wt%) was calculated by the mass of slag. To ensure the mechanical properties of the reaction product, dosages of sodium carbonate between 4 and 8 Na 2 O wt% by mass of slag were chosen and the water to solid ratio was kept the same as the reference. However, the produced alkali activated materials were too viscous, which leads to a ...

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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,

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Sodium carbonate activated slag as cement replacement in ...

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 ...

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Performance and sustainability overview of sodium ...

2021-3-1  Sodium carbonate was used as an activator in alkali-activated slag systems. • Sodium carbonate activated slag can be used as an alternative to Portland cement. • Materials made with sodium carbonate activated slag exhibited good properties. • Sodium carbonate is more

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

Blast furnace slag-Mg(OH)2 cements activated by sodium carbonate Sam A. Walling, Susan A. Bernal, Laura J. Gardner, Hajime Kinoshita and John L. Provis * 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 ...

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

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

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Alkali-activated slag cements produced with a blended ...

2021-8-26  An alkali-activated slag cement produced with a blend of sodium carbonate/sodium silicate activator was characterised. This binder hardened within 12h and achieved a compressive strength of 20MPa after 24h of curing under ambient conditions, which is associated with the formation of an aluminium substituted calcium silicate

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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  Reducing the shrinkage of sodium carbonate activated slag by controlling the reaction mechanism. 9th International Symposium on Cement Concrete,1-3 November 2017, Wuhan, China. 2. Yuan, B., Yu, Q.L. Brouwers, H.J.H..

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Assessing the chemical involvement of limestone powder

2017-2-9  This study aims to investigate the effect of limestone powder (LP) on the reaction of sodium carbonate activated slag. The results show that the incorporated LP up to 30% improves the strength development, especially at advanced curing ages. A slightly accelerated reaction is observed for samples containing low amount of LP (≤5%), while mixture with 10% LP shows the optimized results with ...

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

Blast furnace slag-Mg(OH)2 cements activated by sodium carbonate Sam A. Walling, Susan A. Bernal, Laura J. Gardner, Hajime Kinoshita and John L. Provis * 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 ...

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

Abstract. 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 ...

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EFFECTS OF STEAM CURING ON STRENGTH

In the current study, UFA and slag were used as a replacement for cement, steam curing and chemical activators were used to accelerate hydration of cement and fly ash, and then compared with moist ...

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Comparison of Three Plasticizers in Carbonate-Activated ...

2017-8-1  Abstract: Characteristics of a sodium carbonate-activated slag concrete in presence of different plasticizers are presented and discussed. Inclusion of a calcined clay in the activator system allows for a more rapid curing in a system that is known to cure slowly. Depending upon the plasticizer (lignosulfonate, polycarboxylate or naphthalene ...

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Chloride binding and mobility in sodium carbonate ...

2017-12-21  of sodium carbonate-activated slag cement are not yet fully understood. The phase assemblages of AAS cements are mainly controlled by the chemistry of the slags and activators used [7, 15–18], and the microstructures and mechanical properties of AAS

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(PDF) Alkali-activated slag cements produced with a ...

An alkali-activated slag cement produced with a blend of sodium carbonate/sodium silicate activator was characterised. This binder hardened within 12 h and achieved a compressive strength of 20 ...

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Performance of green fibre-reinforced composite made

2020-5-2  Sodium-carbonate-activated slag can be used as an alternative sustainable binder in fibre-reinforced composite as the use of Portland cement is totally eliminated. 2. Sodium carbonate activated fibre-reinforced composite exhibits outstanding mechanical and

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Mechanical Properties of Na2CO3-Activated High-Volume ...

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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Autogenous and drying shrinkage of sodium carbonate ...

2017-10-30  2.2. Experimental methods. The reference paste sample was sodium carbonate activated slag with the dosage of sodium carbonate 4% (equivalent Na 2 O by mass of slag) and water to solid ratio 0.4 (solids include slag and sodium carbonate powder), while the other mixtures were designed with different contents of limestone powder (up to 50 vol%). The name of the mixtures was designated as the ...

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EFFECTS OF STEAM CURING ON STRENGTH

In the current study, UFA and slag were used as a replacement for cement, steam curing and chemical activators were used to accelerate hydration of cement and fly ash, and then compared with moist ...

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Performance of green fibre-reinforced composite made

2020-5-2  Sodium-carbonate-activated slag can be used as an alternative sustainable binder in fibre-reinforced composite as the use of Portland cement is totally eliminated. 2. Sodium carbonate activated fibre-reinforced composite exhibits outstanding mechanical and

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Comparison of Three Plasticizers in Carbonate-Activated ...

2017-8-1  Abstract: Characteristics of a sodium carbonate-activated slag concrete in presence of different plasticizers are presented and discussed. Inclusion of a calcined clay in the activator system allows for a more rapid curing in a system that is known to cure slowly. Depending upon the plasticizer (lignosulfonate, polycarboxylate or naphthalene ...

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(PDF) Alkali-activated slag cements produced with a ...

An alkali-activated slag cement produced with a blend of sodium carbonate/sodium silicate activator was characterised. This binder hardened within 12 h and achieved a compressive strength of 20 ...

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Mechanical Properties of Na2CO3-Activated High-Volume ...

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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Dry powder alkali-activated slag cements Advances in ...

2015-9-15  The optimum concentration of sodium carbonate was equivalent to 35% and 45% sodium oxide (Na 2 O) for precast and in situ application, respectively. The accelerating admixture is recommended at 6% for dry powder alkali-activated slag cements.

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Properties of Alkali Activated Slag Concrete Incorporating ...

Alkali activated slag (AAS) has gained huge attention in recent years due to its ability to replace ordinary Portland cement (OPC) as a binder in concrete. A need to replace OPC is imminent due to the high carbon dioxide emitted into the environment during its production. However, the use of this type of binder did not eliminate the huge strain placed on the deposit of natural resources.

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Cementitious property of NaAlO 2 -activated Ge slag as ...

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%, 15wt%, 20wt%, and ...

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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 Cambridge,

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