The single-factor experiments are designed to quantitatively investigate the effects of silica fume, mineral powder, and fly ash on the mechanical and thermal insulation properties of desulfurization gypsum-based …

Industrial solid waste—such as red mud (RM), desulfurization gypsum (DG), fly ash (FA), coal gangue (CG), and blast furnace slag (BFS)—is emitted by aluminum oxide plants, power …

Silage and flue gas desulfurized gypsum as additivesimprove green waste composting. J. ENVIRON. CHEM. ... Investigation into the synergistic effects in hydrated gelling systems containing fly ash, desulfurization gypsum and steel slag. CONSTR. BUILD. MATER., 187 (2018), pp. 1113-1120, 10.1016/j.conbuildmat.2018.07.241.

Li et al. added cement, fly ash, and lime to gypsum and observed that the compressive strength increased when the ratio of cement, fly ash, and lime was 10%, 20%, and 14.86%, respectively. Guo et al. [ 32 ] determined that a 75% desulfurization gypsum, 5% cement, and 20% mineral powder ratio yielded FGDG blocks with good physical properties.

Two types of SWs, including fly ash (FA) and desulfurized gypsum (DG), were used to prepare cementitious backfilling materials for underground mined-out areas. Ordinary Portland cement (OPC) was ...

Wansom et al. calcined FGD gypsum into flue gas desulfurized plaster, mixed it with fly ash and ordinary Portland cement to expand its applicability, improving its water resistance and compressive strength and minimizing the risk of sulfate attack under wet conditions (Wansom et al., 2019). Utilizing the excellent water performance of FGD ...

The influence of steel slag (SS), silica fume (SF), and fly ash (FA) as mineral admixtures on the physical, mechanical, and microscopic properties of GSLM was …

Most of the DFA was converted into low-value desulfurized gypsum [17,18]. Therefore, a large amount of DFA is currently deposited in the open air, which has seriously harmed the environment [19]. DFA as a type of industrial solid waste, ... Catalytic Pyrolysis of Sawdust with Desulfurized Fly Ash for Pyrolysis Gas Upgrading ...

In order to improve the early strength of fly ash blended cement concrete under steam curing conditions, fly ash was partly substituted by calcined flue gas desulfurization (FGD) gypsum and active calcium aluminate. The …

In this study, superfine fly ash slurry [WGFA] was prepared by wet grinding from the coal fly ash. Cement-fly ash binder with 30%, 50%, and 70% dosage of fly ash was designed, with a water/binder ...

Effects of kaolin addition on mechanical properties for cemented coal gangue-fly ash backfill under uniaxial loading," Energies. 14, 3693 (2021). ... Research on water-resistant gypsum blocks made from flue gas desulfurized gypsum ... Pipeline transportation model with pressure pulsation for high-concentration viscous paste," Phys. Fluids ...

In this study, a new type of flowable lightweight soil, called desulfurized gypsum–fly ash flowable lightweight soil, was formulated using fly ash, industrial waste …

The obtained semi-aqueous desulfurized gypsum was the original desulfurized gypsum, which was placed in an oven at 180 °C and dehydrated for 2 h under synchronous heating with the box. ... Research on cementing system and durability of desulfurization gypsum-fly ash-cement. Silicate Bulletin, 33 (2) (2014), pp. 315-320 (Chinese) View in Scopus ...

3 School of Civil Engineering and Transportation, Permafrost Institute, Ministry of Education Northeast-China Station of Permafrost Geo-Environment, Northeast Forestry ... Therefore, in this study, a new type of curing agent, CFSD (cement-fly ash-slag-desulfurized gypsum), is proposed for this soil. The effects of different curing agent dosages ...

To resolve problems caused by the accumulation of flue gas desulfurization gypsum (FGDG) in the environment, a polymer material was prepared using FGDG, granulated blast furnace slag …

Wang Q., Li M., Yang J. D., Cui J. Y. Mechanical Strength of Solidified Lead Contaminated Soils by Cement, Fly Ash and Desulfurized Gypsum. ... This article was published in Transportation Research Record: Journal of the Transportation Research Board. VIEW ALL JOURNAL METRICS. Article usage * Total views and downloads: 104

Desulfurized gypsum is an industrial by-product gypsum obtained after flue gas desulfurization in coal-fired or oil-fired power plants [1]. Its main components and physical and chemical …

Mica schist weathered soil possesses a number of poor engineering characteristics, which make it difficult to use as a subgrade material for resource utilization. Therefore, in this study, a new type of curing agent, CFSD (cement–fly ash–slag–desulfurized gypsum), is proposed for this soil. The effects of different curing agent dosages, age of …

In this study, the potential of using desulfurized gypsum (DG), phosphogypsum (PG), gypsum dihydrate (G), and calcium carbide slag (CS) in the production of supersulfated cement (SSC) was investigated. ... Performances and microstructure of one-part fly ash geopolymer activated by calcium carbide slag and sodium metasilicate powder," Constr ...

It was found that when red mud, fly ash, and desulfurized gypsum are used to prepare road base materials, in the case of (CaO + Na 2 O)/(SiO 2 + Al 2 O 3 ) = 0.88, the UCS of road base materials ...

The grouting technique is an efficient method for enhancing the stability of cracked slopes through the use of grouting materials. Conventional cement-based grouting materials are costly, energy-intensive, and environmentally damaging. Additionally, cement-hardening slurry is prone to cracks between the slurry and the rock. To address these issues, this study proposed …

By using one type of original red mud and three types of fly ash, this study revealed that with high alkalinity and desulfurization capacity, the red mud could serve as an excellent FGD sorbent. After FGD, the sodium sulfate in the desulfurized red mud acted as a chemical activator for geopolymer made with class C fly ash.

The fly ash and desulfurized gypsum in the cementitious filler material were collected from Dananhu Power Station in Hami, Xinjiang. The main difference between desulfurization gypsum and natural gypsum lies in the different physical states: natural gypsum is in the form of lumps stuck together, while desulfurization gypsum exists as individual ...

This study aims to carry out the performance characterization and life cycle assessment (LCA) of SFP after composite modification of cement-based grouting materials by …

Recently, the steel slag-fly ash-desulfurized gypsum (SS-FA-DG) composite system was developed as a novel building cementitious material, however, its reaction mechanism and reaction process mains unclear. This paper investigated the reaction kinetics of SS-FA-DG composite system by evaluating the influence of curing temperature on the ...

Red mud (RM), fly ash (FA) and desulfurized gypsum (DG) are harmful solid wastes that need to be treated. In this study, RM, FA, DG were used as the main raw materials …

Red mud (RM), fly ash (FA) and desulfurized gypsum (DG) are harmful solid wastes that need to be treated. In this study, RM, FA, DG were used as the main raw materials to prepare road base materials based on the different (CaO + Na 2 O)/(SiO 2 +Al 2 O 3) molar ratio, and its mechanical properties, durability, microstructure and environmental performance were …

Preparation, characterization and application of red mud, fly ash and desulfurized gypsum based eco-friendly road base materials. J. Clean. Prod. (2021) N.a. Zhang et al. Hydration characteristics and environmental friendly performance of a cementitious material composed of calcium silicate slag. J. Hazard. Mater.

fly ash, desulfurized gypsum, cement and silt are poured into the mixer for dry mixing for about 1 min. Next, pour half of the weighed water and stir for 30 s, followed by adding the

Using solid wastes (SWs) as backfilling material to fill underground mined-out areas (UMOAs) solved the environmental problems caused by SWs and reduced the backfilling cost. In this study, fly ash (FA), gypsum and steel slag (SS) were used to prepare cement-based composites (CBC). The uniaxial compression, computed tomography (CT) and scanning …