Strength development and microstructure of recycled gypsum-soda …
This paper aims to evaluate the recycled potential of gypsum waste and wet-basis soda residue combined with GGBS to prepare geopolymer for subgrade applications. In this regard, the geopolymer mixture containing 0%, 5%, 10% recycled gypsum and 60%, 70%, 80% soda residue by dry weight will be prepared as partly substitute for GGBS.
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Airsweep®
Uses vibration to shake material free. Air flows into a disc, which flaps and vibrates. Activation Radius. Effective radius of 4 feet. No specific activation area. Small activation radius. Material Control. Can be used with dry, wet, or sticky materials. Sticky material still builds up, even if bridging is controlled.
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Kinetics of gypsum dissolution in water | Geochemistry International
The kinetics of dissolution of different lithological varieties of gypsum was experimentally investigated at 5–25°C and P = 0.1 MPa, and a simple rate model was proposed on the basis of the sum of the rates of forward and backward reactions and proportionality to the activity product of calcium and sulfate ions. The activation energies …
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Inhibition of hydrogen sulfide generation from disposed gypsum …
Abstract. Disposal of gypsum drywall in landfills has been demonstrated to elevate hydrogen sulfide (H (2)S) concentrations in landfill gas, a problem with respect to odor, worker safety, and deleterious effect on gas-to-energy systems. Since H (2)S production in landfills results from biological activity, the concept of inhibiting H (2)S ...
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Performance Optimization and Characterization of Soda …
2.1. Materials. Geopolymer backfill pastes are obtained from a chemical geosynthetics process using alkali-activated silica and alumina phase materials [].In this study, the raw materials used to manufacture geopolymer backfill paste are low-calcium fly ash (FFA), soda residue (SR), sodium silicate (NS) pellets and beta-hemihydrate gypsum (BHG) …
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Laboratory Evaluation for Utilization of …
Abstract. Carbide slag was used as an activator to improve the activity of anhydrous phosphogypsum. Carbide slag could greatly improve the mechanical strength …
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Synthesis and optimization of green one-part geopolymer …
Soda residue (SR) is produced from the ammonia-soda process of Na 2 CO 3 and contains large amounts of calcium components, such as CaCO 3, CaSO 4, Ca(OH) 2, and CaCl 2. The emission and storage of them have caused serious environmental problems such as land occupation, soil salinization, and underground water pollution …
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Amelioration of soda saline-alkali soil through
A field plot experiment was conducted to examine the effectiveness of equidistant slotting in combining with gypsum application on the amelioration of soda saline-alkali soil in the west Songnen ...
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3 Ways to Activate Baking Soda
1. Combine with an Acid. One of the most common ways to activate baking soda is by mixing it with an acid. This reaction causes it to release carbon dioxide gas, which helps baked goods rise. For every one part baking soda, you may want to mix it with two parts acid to achieve this activation. Common acidifying agents include:
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[PDF] Resistance of Soda Residue–Fly Ash Based …
The results show that the resistances of the SR–FFA–GEO mortar with 20% SR (namely M10) to 5% HCl and 5% Na2SO4 environments are superior to those of cement mortar. The early mechanical performances of low-calcium fly ash (FFA)-based geopolymer (FFA–GEO) mortar can be enhanced by soda residue (SR). However, the resistance of …
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Laboratory Evaluation for Utilization of Phosphogypsum
Carbide slag was used as an activator to improve the activity of anhydrous phosphogypsum. Carbide slag could greatly improve the mechanical strength of anhydrous phosphogypsum than K2SO4. The compressive strength of 11 wt% carbide slag and 1 wt% K2SO4 activated anhydrous phosphogypsum increased greatly to 8.6 MPa at 3 d, and …
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FLASH CALCINERS A focus on flash calcining
production), leading to the activation of alumina and silica oxides. It is important to note that a low calcination temperature will not activate the clay completely and an excessive calcination temperature can cause the recrystallisation of the clay structure. Both cases substantially decrease the reactivity of the clay.
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Strength and Mechanism of Carbonated Solidified …
Hence, this study introduces a novel environmentally friendly composite, formed by sodium hydroxide (used as an activator), desulfurized gypsum and steel …
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Alkali Activated Cementitious Materials: An Overview
Activation of fly ash/cement systems using calcium sulfate anhydrite (CaSO4). Cement and Concrete Research, Vol. 31, Issue. 6, p. 873. CrossRef; ... Effect of addition of tire chips …
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Gypsum – Hexametaphosphate activation on the hydraulic …
The hydraulic and related properties of Portland-slag cement containing granulated blast furnace slag as high as 40% (w/w) has been examined at room temperature under the mixed activation of gypsum and sodium hexametaphosphate. The study confirmed that the minor dosage of polyelectrolyte, hexametaphosphate with 4% …
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Activation mechanisms of three types of industrial by …
@article{Xu2021ActivationMO, title={Activation mechanisms of three types of industrial by-product gypsums on steel slag–granulated blast furnace slag-based binders}, author={Chengwen Xu and Wen Ni and Ke-qing Li and Siqi Zhang and Dong Xu}, journal={Construction and Building Materials}, year={2021}, volume={288}, …
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Metals | Free Full-Text | Preparation and Characterization of …
To investigate the issues related to significant environmental damage and poor resource utilization of soda residue (SR), the composition and microstructure of hydration products of the GGBS (ground granulated blast-furnace slag) synergistically activated by NaOH-SR are characterized by an X-ray diffraction (XRD), Fourier-transform …
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Preparation and characterization of an alkali …
Blast-furnace slag, soda sludge, and industrial gypsum are recycled. • The alkali-activated cementitious material is a supplement to conventional cement. • Soda sludge is an eco-friendly alkaline activator for blast-furnace slag activation. • 6 wt% …
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Materials | Free Full-Text | Properties and Hydration …
Download keyboard_arrow_down. Browse Figures. Versions Notes. Abstract. Soda residue (SR), an industrial solid waste, pollutes the environment due to …
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Soda Springs Phosphate
Poultry Compost. We make our organic certification and Safety Data Sheets easily accessible through this page. Simply download the necessary documents to have them on file.
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Amelioration of soda saline-alkali soil through equidistant …
Abstract: A field plot experiment was conducted to examine the effectiveness of equidistant slotting in combining with gypsum application on the amelioration of soda saline-alkali soil in the west Songnen Plain of Northeast China. Equidistant slotting at the soil depth 20-40 cm and 1 m apart could significantly decrease the degree of soil compaction within the …
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Field experimental investigation on filling the soda residue …
The optimal water content and maximum dry density of the soda residue soil with the optimal mix ratio are 63.5% and 0.88 g/cm 3, respectively. After 5 months of natural drying, the soda residue soil filled by liquid soda residue and liquid fly ash has higher strength and better uniformity of hardness.
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The kinetics of the precipitation of gypsum, CaSO4·2H2O
Uncontrolled gypsum precipitation can also cause hardships during reverse osmosis processes; this issue was also addressed in the literature [9, 41, 42]. Gypsum precipitation as a side-product during the neutralization of some wastewaters was also investigated [3, 43]. From these examples, one may conclude that the precipitation …
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Activation mechanisms of three types of industrial by …
Volume 288, 21 June 2021, 123111. Activation mechanisms of three types of industrial by-product gypsums on steel slag–granulated blast furnace slag-based binders. Chengwen …
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Mechanical Activation on Phosphogypsum: …
Mechanical activation technology together with neutralizing additives was suggested for stabilizing phosphogypsum samples' properties and improving their …
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Autoclave‐Free Formation of α‐Hemihydrate Gypsum
The two steps included are to 1) produce CaSO4•2H2O (DH) using the discharged soda residues and H2SO4; 2) transform DH into a-gypsum in a mixed solution with additives at 368 K.
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Alkali-activated materials without commercial activators: a …
Zhao et al. conducted a study in which they blended 5% gypsum with SS powder to investigate the gelation properties of SS. The hydration process of the SS-gypsum mixture exhibited two exothermic peaks, resembling the behavior observed in cement hydration. ... (2020) Activation of blast furnace slag with soda production …
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Alkali Activated Cementitious Materials: An Overview
Alkali-activated cementitious materials have considerable potential, with properties ranging from very high early strength to very high long term strength and low porosity. The role of alkalis in activating industrial by-products such as ground granulated (glassy) blast-furnace slag, ultra-fine silica fume or other by-product silicas, glassy fly …
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Asmr
Asmr - baking soda+ gypsum - white baking soda #bakingsoda #asmr #crush. farelove44 · Original audio
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Researches on Application of Gypsum for the Improvement of Soda …
The method of field locational experiment was used to conduct the researches of the improving actions of gypsum on soda saline and alkaline soil.The results showed that the application of gypsum increased the standing number of seedlings and the growth of maize.Af-ter the application of gypsum,the soil pH values were significantly …
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