scholarly journals Orthogonal Experimental Studies on Preparation of Mine-Filling Materials from Carbide Slag, Granulated Blast-Furnace Slag, Fly Ash, and Flue-Gas Desulphurisation Gypsum

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Mingyue Wu ◽  
Xiangming Hu ◽  
Qian Zhang ◽  
Weimin Cheng ◽  
Zunxiang Hu
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Flue Gas ◽  
Blast Furnace Slag ◽  
Raw Materials ◽  
Setting Time ◽  
Fgd Gypsum ◽  
Granulated Blast Furnace Slag ◽  
Carbide Slag ◽  
Furnace Slag

Environmentally friendly and cheap composite green cementitious materials have been prepared from carbide slag, fly ash, flue-gas desulphurisation (FGD) gypsum, and granulated blast-furnace slag (GBFS) without using cement clinker. Orthogonal testing was used to investigate the effects of the raw materials on the amount of water required for reaching standard consistency and consistency, setting time, slump value, and strength of the produced materials after curing for 7 d and 28 d. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques were used for the analysis of the sample microstructure and hydration products as well as for the exploration of possible hydration mechanisms. We found that, among the utilised raw materials, the addition of FGD gypsum had the most significant effect on the setting time and amount of water required for reaching standard consistency and consistency, while the addition of GBFS deeply affected the slump value. The optimal activation results were obtained when the mass ratio of carbide slag : fly ash : GBFS : FGD gypsum was equal to 12.1 : 60.6 : 18.2 : 9.1.

scholarly journals Effect of Flue Gas Desulfurization Gypsum on the Properties of Calcium Sulfoaluminate Cement Blended with Ground Granulated Blast Furnace Slag

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 382 ◽  
Author(s):  
Danying Gao ◽  
Zhenqing Zhang ◽  
Yang Meng ◽  
Jiyu Tang ◽  
Lin Yang
Keyword(s):  
Blast Furnace ◽  
Mechanical Strength ◽  
Flue Gas ◽  
Blast Furnace Slag ◽  
Setting Time ◽  
Flue Gas Desulfurization ◽  
Calcium Sulfoaluminate Cement ◽  
Calcium Sulfoaluminate ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

This work aims to investigate the effect of additional flue gas desulfurization gypsum (FGDG) on the properties of calcium sulfoaluminate cement (CSAC) blended with ground granulated blast furnace slag (GGBFS). The hydration rate, setting time, mechanical strength, pore structure and hydration products of the CSAC-GGBFS mixture containing FGDG were investigated systematically. The results show that the addition of FGDG promotes the hydration of the CSAC-GGBFS mixture and improves its mechanical strength; however, the FGDG content should not exceed 6%.

scholarly journals Protective Geopolymer Coatings Containing Multi-Componential Precursors: Preparation and Basic Properties Characterization

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3448
Author(s):  
Chenhui Jiang ◽  
Aiying Wang ◽  
Xufan Bao ◽  
Zefeng Chen ◽  
Tongyuan Ni ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Fly Ash ◽  
Portland Cement ◽  
Adhesive Strength ◽  
Blast Furnace Slag ◽  
Setting Time ◽  
Rapid Test ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

This paper presents an experimental investigation on geopolymer coatings (GPC) in terms of surface protection of civil structures. The GPC mixtures were prepared with a quadruple precursor simultaneously containing fly ash (FA), ground granulated blast-furnace slag (GBFS), metakaolin (MK), and Portland cement (OPC). Setting time, compressive along with adhesive strength and permeability, were tested and interpreted from a perspective of potential applications. The preferred GPC with favorable setting time (not shorter than 120 min) and desirable compressive strength (not lower than 35 MPa) was selected from 85 mixture formulations. The results indicate that balancing strength and setting behavior is viable with the aid of the multi-componential precursor and the mixture design based on total molar ratios of key oxides or chemical elements. Adhesive strength of the optimized GPC mixtures was ranged from 1.5 to 3.4 MPa. The induced charge passed based on a rapid test of coated concrete specimens with the preferred GPC was 30% lower than that of the uncoated ones. Setting time of GPC was positively correlated with η[Si/(Na+Al)]. An abrupt increase of setting time occurred when the molar ratio was greater than 1.1. Compressive strength of GPC was positively affected by mass contents of ground granulated blast furnace slag, metakaolin and ordinary Portland cement, and was negatively affected by mass content of fly ash, respectively. Sustained seawater immersion impaired the strength of GPC to a negligible extent. Overall, GPC potentially serves a double purpose of satisfying the usage requirements and achieving a cleaner future.

The Strength and Microstructure of High Content FGD Gypsum-Fly Ash-Ground Granulated Blast Furnace Slag Composite Binder

2014 ◽  
Vol 584-586 ◽  
pp. 1514-1518
Author(s):  
Kun Ni ◽  
Shi Yun Zhong ◽  
Yun Xing Shi ◽  
Yan Gang Zhang
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Analysis Of Variance ◽  
Blast Furnace Slag ◽  
Hydration Product ◽  
Range Analysis ◽  
Composite Binder ◽  
Fgd Gypsum ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

In this paper, FGD gypsum mixed with fly ash (FA) and ground granulated blast furnace slag (GGBFS) was used as a composite binder. The strength experiments of range analysis and analysis of variance (ANOVA) showed that the optimal proportion of FGD gypsum, FA and GGBFS was 6:3:4. The study of microstructure of hardened paste proved that the hydration product was mainly C-S-H gels and ettringite, and some ettringite crystals grew from C-S-H gels.

scholarly journals Application of fly ash/granulated blast-furnace slag cementing material for immobilization of Pb2+

2018 ◽  
Vol 175 ◽  
pp. 01020 ◽  
Author(s):  
Li Chao ◽  
Zhao Feng-qing
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Low Cost ◽  
Hydration Products ◽  
Experimental Conditions ◽  
Granulated Blast Furnace Slag ◽  
Carbide Slag ◽  
Cementing Material ◽  
Furnace Slag

Based on activation and synergistic effect among various materials, a low-cost cementing material. FGC binder, was prepared by using fly ash. granulated blast-furnace slag (BFS). carbide slag and compound activator. The results showed that the immobilization efficiency of FGC binder for Pb2+: is higher than that of OPC cement. The hydration products and mechanism of immobilization were analyzed by using XRD. The major products of FGC binder are C-S-H, C-A-H. ettringite and zeolite-like materials. Under the experimental conditions, the Pb2+ curing efficiency of FGC binder is 1.04 ~ 1.24 times that of ordinary Portland cement.

scholarly journals Compressive Strength and Durability of FGD Gypsum-Based Mortars Blended with Ground Granulated Blast Furnace Slag

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3383
Author(s):  
Min Pang ◽  
Zhenping Sun ◽  
Huihao Huang
Keyword(s):  
Compressive Strength ◽  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Raw Materials ◽  
Steam Curing ◽  
Curing Conditions ◽  
Fgd Gypsum ◽  
Granulated Blast Furnace Slag ◽  
Mix Proportion ◽  
Furnace Slag

One new flue gas desulfurization (FGD) gypsum-based binder is attempted in this article, which is made up of FGD gypsum, ground granulated blast furnace slag (GGBS) and ordinary Portland cement (OPC). Influences of raw materials, chemical activators, and curing conditions on the compressive strength of this new binder-based mortar, as well as its durability performances and microscopic characteristics, are investigated in consideration of utilizing FGD gypsum as much as possible. Results show that the compressive strength of this new binder-based mortar under normal curing conditions could increase along with GGBS dosages from three days to 90 days. The compressive strength of one selected mix proportion (FG-4550), which contains the highest dosage of FGD gypsum (45 wt.%), is much the same as those containing the highest dosage of GGBS. A better compressive strength of FG-4550 under normal curing conditions could be gained if the fineness of GGBS is improved. The activated effect of CaCl2 on the compressive strength of FG-4550 is superior to that of Ca(OH)2 under steam curing conditions. FG-4550 shows a good capacity for resistance to water, a low shrinkage ratio, but poor compressive strength after 30 freeze-thaw cycles. Based on the mineralogy of X-ray diffraction, the morphology of scanning electron microscopy and the pore diameter distributions of 1H nuclear magnetic resonance, the compressive strength of this FGD gypsum-based mortar mainly depends on clusters of ettringite.

scholarly journals Effect of Mineral Admixtures on the Performance of Low-Quality Recycled Aggregate Concrete

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 596
Author(s):  
Yasuhiro Dosho
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Mineral Admixtures ◽  
Structural Concrete ◽  
Aggregate Concrete ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

To improve the application of low-quality aggregates in structural concrete, this study investigated the effect of multi-purpose mineral admixtures, such as fly ash and ground granulated blast-furnace slag, on the performance of concrete. Accordingly, the primary performance of low-quality recycled aggregate concrete could be improved by varying the replacement ratio of the recycled aggregate and using appropriate mineral admixtures such as fly ash and ground granulated blast-furnace slag. The results show the potential for the use of low-quality aggregate in structural concrete.

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