Frontiers | Utilization of sodium carbonate …
Strain-hardening ultra-high-performance geopolymer concrete with hybrid Na 2 CO 3 and Na 2 SiO 3 activators showed the highest compressive strength (186.0 MPa), tensile strain capacity (0.44%), and tensile strength …
Biomass ash waste from agricultural residues: …
The sodium carbonate activated geopolymer has a low carbon footprint (44.69 kg CO 2-e/m 3) due to the low carbon emission factor of sodium carbonate. The main carbon contributors of the sodium carbonate geopolymer are the GGBS and fine aggregate (Fig. 13). The addition of sodium silicate increased the mechanical performance of the geopolymer ...
Extending applicability of 3D-printable geopolymer to large …
Request PDF | On Oct 1, 2023, Yuning Chen and others published Extending applicability of 3D-printable geopolymer to large-scale scenario via combination of sodium carbonate and nano ...
Acid-resistance of one-part geopolymers: Sodium aluminate …
Geopolymer mixes aluminosilicate waste materials (i.e. fly ash and slag) with alkali activator solutions (i.e. sodium silicate (Na 2 SiO 3) and sodium hydroxide (NaOH)). The fly ash-based geopolymer has been showing promising environmental benefits and …
Characteristic of One-Part Geopolymer as Building Materials …
Solid activators namely sodium hydroxide, sodium silicate, sodium carbonate, sodium oxide, sodium aluminate, calcium hydroxide, potassium carbonate and so on were used to produce dry binders that ...
Synthesizing one-part geopolymers from rice husk ash
This is in agreement with the low loss on ignition of 2.63 wt.% (Table 1) and the tendency of alkaline compounds to carbonate. 2.2. Geopolymer synthesis. One-part geopolymers were synthesized by mixing RHA and solid sodium aluminate, ... except for minor amounts of hydrated sodium carbonate due to carbonation. Curing for longer times than one ...
Low-carbon coal fly ash/superfine iron tailings-based three …
Comparison of effects of sodium bicarbonate and sodium carbonate on the hydration and properties of Portland cement paste. Materials, 12 (7) (2019), p. 1033. Google Scholar ... Optimum mix design of geopolymer pastes and concretes cured in ambient condition based on compressive strength, setting time and workability. J. Build. Eng., 23 ...
The Effect of Sodium Carbonate on the Fresh and Hardened …
This work presents an investigation of fresh and hardened properties of fly ash-based one-part geopolymer activated by mixture of anhydrous sodium metasilicate (Na 2 …
Utilization of sodium carbonate activator in strain …
Utilization of sodium carbonate activator in strain-hardening ultra-high-performance geopolymer concrete (SH-UHPGC) Jian-Cong Lao1, Ling-Yu Xu1, Bo-Tao Huang1,2*, Ji-Xiang Zhu1, Mehran Khan1 and ...
Utilization of sodium carbonate activator in strain …
However, although geopolymer is considered greener than cement, the production and use of the sodium silicate (Na 2SiO 3)as alkaline activator will still contribute to comparatively high carbon emission (Habert et al., 2011), as this material is typically synthesized by dissolving silica in molten sodium carbonate at 1,400°C. Currently,
Effect of sodium carbonate/sodium silicate activator on …
Effect of sodium carbonate/sodium silicate activator on the rheology, geopolymerization and strength of fly ash/slag geopolymer pastes. Author ... Geopolymer is a sub-class of alkali activated materials composed of base materials containing aluminosilicates which can be used for construction with reduced environmental impact by utilisation of ...
Development of greener alkali-activated cement: utilisation of sodium
Sodium carbonate, with a purity of >99%, was supplied in powder form by Fisher scientific, UK. ... one was at 85–105 °C and is attributed to the removal of free evaporable water which is present in the pores of the geopolymer gel products, either C …
Towards greener one-part geopolymers through solid sodium …
The incorporation of Na 2 CO 3 changed the pace of compound formation and yielded sodium carbonate hydrate, N-A-S-H and C-A-S-H binding phases in the MC-OPG. ... Development of high strength one-part geopolymer mortar using sodium metasilicate. Construct. Build. Mater., 236 (2020), Article 117611, 10.1016/j.conbuildmat.2019.117611.
Experimental study on the effect of carbonate ions on ITZs …
The alkali activation solution was prepared by combining sodium silicate solution with sodium hydroxide solution at a mass ratio of 3:2. Fly ash and slag were mixed in a 1:1 mass ratio to serve as precursors. The alkali content of the geopolymer was 7.27 %, the silicon modulus was 1.06, and the liquid-solid ratio was 0.15.
Properties and characterization of green one-part geopolymer …
The replacement of Na 2 SiO 3-anhydrous by sodium carbonate has little influence on the fluidity of one-part geopolymer. And the presence of sodium carbonate increases the final setting time significantly, which is related to the initial pH values of the liquid phase in geopolymer paste.
WO2014075134A1
A solid component activator for use in a geopolymer cement containing a silico-aluminate material comprising a mixture of sodium silicate and sodium carbonate for activating the geopolymer cement by increasing reactivity of the silico-aluminate material in the geopolymer cement when forming geopolymer concrete.
Compressive strength and gel structure improvement in the …
The calcium carbide residue (CCR) was used to prepare"one-part" geopolymer. ... In this case, sodium carbonate was usually combined with CCR to enhance the alkalinity because they can rerelease OH-in the aqueous phase [25], …
Controlling efflorescence in geopolymers: A new approach
In porous geopolymers, high porosity values are one of the problems for rapid efflorescence [25], as the structure is opened and sodium is easily carried to the surface as hydrated sodium carbonate. In conclusion, the geopolymer pore structure is one of the most important factors that control the efflorescence rate [22].
Production of perlite-based-aerated geopolymer using …
Generally, potassium hydroxide (KOH), sodium hydroxide (NaOH), sodium carbonate (Na 2 CO 3), and sodium metasilicate (Na 2 SiO 3) are the most used activators in cementless paste and mortar [29, 30]. The choice of activator and the amount to be used affect the strength development of the geopolymer.
Evaluation of environmental sustainability of one-part …
Sodium carbonate is an indirect means of alkalinity in the geopolymer system with minimal safety hazards. This one-part geopolymer binder contained 50 % of fly ash, 32 % …
Understanding the role of calcium silicate slag in sodium carbonate
This study assessed the impact of calcium silicate slag (CSS), an industrial by-product of aluminum extraction from fly ash, on the reaction kinetics, compressive strength, and efflorescence of one-part sodium carbonate-activated slag (SCS). Various proportions of CSS (0%, 10%, and 20%) were used to substitute for slag. The resulting performances were …
Carbon sequestration in earth-based alkali-activated mortar: …
Sodium carbonate is expected to form through carbonation of zeolite and N-A-S-H formed as a result of clay and fly ash dissolution. ... among all constituents in a geopolymer mix sodium silicate ...
Basic Properties of y Ash/Slag -Concrete Slurry Waste …
Basic Properties of fly Ash/Slag-Concrete Slurry Waste Geopolymer Activated by Sodium Carbonate and Different Silicon Sources Yingli Gao1*, Kairui Duan1, Shuncheng Xiang1 and Wei Zeng2 1School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Changsha, China, 2China West Construction Hunan Group Co., Ltd., Changsha, …
Mix proportion design and carbon emission assessment of …
To achieve dual optimization of the mechanical properties and environmental impacts of geopolymer concrete (GPC), this study proposes a high-strength geopolymer …
Physical, Mechanical and Durability Properties of Eco …
These materials are rich in aluminum and silicon and can chemically react with alkaline activators like sodium hydroxide (SH), sodium silicate (SS), and sodium carbonate …
Compressive Strength of Mortar Made with One-Part
One-part geopolymer concrete is an advancement over the conventional two-part geopolymer concrete. In this study, a geopolymeric binder was prepared in powder form …
A novel method to produce dry geopolymer cement powder
The addition of moderate amount of calcium carbonate to a geopolymer has significant improvements on the geopolymer structure and properties [29], [30]. ... On the other side, the carbonates (carbonate from calcium and sodium carbonate) in dry activators (NC14, NC9) act as filler material which reduced the pore sizes of cement paste and ...
Strength Enhancement Mechanism of Slaked Lime on One …
AbstractSlaked lime was used to synergize with sodium carbonate to activate the slag. Experimental studies were carried out to investigate the effect of the proportion of activator on its workability and mechanical properties. The hydration products, ...
Sulphate resistance of one-part geopolymer synthesized by …
To apply this type of new cementitious material in sulphate-rich environments, such as wastewater system and sewer network, we investigated the chemical and microstructure properties of one-part geopolymers synthesized by calcium carbide residue (CCR)-sodium carbonate-activated slag when they were exposed to sodium sulphate and magnesium ...
Towards greener one-part geopolymers through solid …
The solid alkali activator can be sodium metasilicate (Na 2 SiO 3), sodium aluminate (NaAlO 2), sodium hydroxide (NaOH) or sodium carbonate (Na 2 CO 3). Na 2 SiO …