Showing papers on "Sodium silicate published in 2021"
TL;DR: In this paper, the application of geopolymer tiles in conditions of high temperature and saturation was evaluated in order to understand how fires and rains modify the performance of these materials, and the results showed that due to the non-formation of polysialate networks in an effective way, formulations 3.50 and 4.00 showed a high drop in properties, differently from formulations 2.25, 2.50, and 3.00.
79 citations
TL;DR: Wang et al. as mentioned in this paper investigated the adsorption capacity of oiltea camellia shells for heavy metal removal from wastewaters or stabilization in contaminated soils, and found that silicate-modification significantly increased the specific surface area (SSA) and slightly increased the porosity of biochar.
75 citations
TL;DR: In this article, a sequential chemical roasting, water leaching, and acid leaching process was developed for the recovery of rare earth elements (REEs) from coal fly ash (CFA).
61 citations
TL;DR: In this paper, the effect of silica fume and sodium silicate nature on the hardened properties, including compressive strength, hydration product and microstructure of alkali-activated municipal solid waste incinerator fly ash, was reported.
55 citations
TL;DR: In this paper, reaction powder concrete (RPC) concept was adopted in geopolymer concrete (GPC) technology to develop ultra high performance concrete (UHPC) Ultra high performance geo-mer concrete was developed by completely eliminating Portland cement (PC) with industrial by-products such as ground granulated blast furnace slag (GGBFS) and silica fume (SF) activated with sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) solution.
Abstract: This paper presents the investigation on the adoption of reaction powder concrete (RPC) concept in geopolymer concrete (GPC) technology to develop ultra high performance concrete (UHPC) Ultra high performance geopolymer concrete (UHPGPC) was developed by completely eliminating Portland cement (PC) with industrial by-products such as ground granulated blast furnace slag (GGBFS) and silica fume (SF) activated with sodium hydroxide (NaOH) and sodium silicate (Na2SiO3) solution The fresh (flow) and mechanical (compressive strength) properties of the mixes with varying replacement level of GGBFS with silica fume, river sand with quartz powder and the inclusion of steel fibres were investigated The results infer that the inclusion of silica fume, quartz powder and steel fibres has a momentous role on the strength development of the UHPGPC mixes Additionally, statistical analysis has been carried out by design of experiments using response surface methodology The ecological parameters were also assessed with the aid of embodied energy and carbon dioxide emission and the results were compared From the results, it has been inferred that the analytical results were well correlated with the experimental results and the ecological parameters were also less compared to the cement concrete mixes and terms it to be sustainable production
54 citations
TL;DR: In this paper, the authors evaluated the reliability of a new algorithmic mix design method that relies on pre-targeting ratios of SiO2/Al2O3, Na2O/SiO2 and liquid/solid of CW precursor powder and sodium silicate and sodium hydroxide alkaline reagents.
51 citations
TL;DR: In this article, a combination of experimental characterization techniques, to study the pore solution composition and microstructure of SS-AAS pastes and thermodynamic calculations have been applied.
48 citations
TL;DR: In this article, the effect of nano titanium dioxide (nano-TiO2) on fly ash based geopolymer concrete (FAGPC) with oven curing at 600c for 48 hrs.
47 citations
TL;DR: In this paper, the strength and microstructure evolutions of stabilized dredged sludge (DS) under different water contents, via a range of unconfined compressive strength (UCS), X-ray diffraction (XRD) and scanning electron microscopy (SEM) tests, were analyzed and discussed.
44 citations
TL;DR: In this article, the authors investigated the mechanical properties, shrinkage, and heat evolution of concrete using high-calcium fly ash as a binder with two alkali activators: sodium silicate (Na2SiO3) and sodium hydroxide (NaOH).
42 citations
TL;DR: In this article, mine tailings' geopolymerization by sodium silicate was investigated at different pH values and compared with cementation by Portland cement, and it was found that the elevation in sodium silicates content decreases the acidification influence of mine tails and postpones the strength development.
TL;DR: In this paper, an eco-friendly ambient cured one-part geopolymer mix was developed by using lithium slag waste and blast furnace slag as precursors and anhydrous sodium silicate as alkaline activator.
TL;DR: In this article, two different laterites (iron contents of 13.07 and 49.34% respectively) were selected and calcined at 600°C, and the obtained calcined laterites, namely LAI600 and LAC600, were separately mixed with an alkaline solution (silicate modulus of 1.35) or an acidic solution (phosphoric acid solution at pH ≥ 2) for the synthesis of inorganic polymer products.
TL;DR: In this paper, N-ethylaniline (PNEA) composites with varying silicate content were fabricated on copper through a novel electropolymerized strategy in acidic solution.
TL;DR: In this paper, the effect of silica fume on alkali leaching and efflorescence formation of alkali-activated slag was investigated in the presence of ground granulated blast-furnace slag (BFS).
TL;DR: In this article, the use of borax composite sodium silicate activator (B) in place of water glass (S) in the fly ash-GGBS composite (4:1) geopolymerization was investigated.
TL;DR: In this paper, the compressive strength, modulus of elasticity, and flexural strength of RCA-based roller compacted geopolymer concrete (RCGPC) composite mixtures were analyzed using Scanning electron microscopy (SEM), X-Ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR).
TL;DR: In this article, the potential utilization of the stone waste (mainly containing calcite and dolomite) in the alkali-activated slag based paste backfill (APB) was investigated.
TL;DR: In this paper, the role of calcium carbonate minerals in an alkali-activated system through their reaction with sodium silicate solution was investigated using isothermal conduction calorimetry and FTIR.
TL;DR: A source of sub-bituminous coal bottom ash was mechanochemically activated by co-grinding fly ash and a sodium silicate powder for use in a geopolymer application as mentioned in this paper.
Abstract: A source of sub-bituminous coal bottom ash was mechanochemically activated by co-grinding fly ash and a sodium silicate powder for use in a geopolymer application. A total of nine different mixes were considered to study the effects of the mechanochemical treatment, mixing procedure, and bottom ash loading. The compressive strength, reactivity, rate of geo-polymerization and morphology were investigated using isothermal calorimetry, nano-indentation, optical and scanning electron microscopy, and Fourier-transform infrared spectroscopy. The solid-state mechanochemical activation attacks the fly and bottom ash particles producing small sheet-like activated agglomerates. The activation enhances the dispersion of the activated particle, alters the sodium silicate and aluminosilicate reaction kinetics and intensifies the interconnectivity of geopolymer structure, decreases pore size, and significantly increases compressive strength (between 60% and 80%). When treated in this manner, the bottom ash serves as an effective extender to fly ash in geopolymer systems up to 50% replacement of fly ash without significant reduction in mechanical strength or significant alteration to the microstructure.
TL;DR: In this paper, the formulation of an effective utilization regime of C&D waste (cement concrete) for its re-consumption as geopolymer mortar has been studied and the results reveal that the optimum compressive strength of 20.7 MPa is achieved at a silicate modulus of 1.54 and Na2O% of 12.5%.
TL;DR: In this paper, a comprehensive review of the effect of various commercial and byproduct types of alkali activators on the fresh properties, mechanical properties, and durability of ground granulated blast furnace fire slag-based concrete is presented.
TL;DR: In this paper, the authors investigated the feasibility of using an agro-industrial byproduct rice husk ash based alkaline silicate as a substitute for silica-based activators in the production of geopolymer binders with ground granulated blast furnace slag (GGBFS) as source material.
TL;DR: In this article, two alkaline activators (sodium silicate (SS) and sodium hydroxide (SH)) were used to develop different samples of alkali-activated CS cementitious material, respectively.
TL;DR: In this article, a new encapsulated phase change material (EPCM) was prepared by in-situ dehydration and condensation reaction, which consists of silica shell derived from sodium silicate and paraffin wax core.
TL;DR: In this paper, an un-densified silica fume was appropriately dissolved in a 10M sodium hydroxide solution to obtain a sodium silicate alternative (SSA) solution having the SiO2/Na2O molar ratio of 2.
TL;DR: In this paper, the effectiveness of inorganic coatings based on alkali-activated materials (AAM) applied to concretes of Portland cement (substrate) exposed to chlorides was evaluated.
TL;DR: In this article, two pairs of silicon and aluminium sources were used for synthesizing zeolites which were labeled as Z1 and Z2, respectively, and the results from XRD, BET and surface analysis indicated that sodium silicate and sodium aluminate sources yielded zeolite with high surface area and pore volume.
TL;DR: In this article, a preliminary mix design of the geopolymer-based ultra-high-performance concrete (G-UHPC) developed using the alkaline activated alumino-silicate source materials was comprehensively investigated via a series of flowability, compression and flexure tests.