Utilization of flue gas desulfurization gypsum as an activation agent for high-volume slag concrete

Jiang, Linhua; Li, Chenzhi; Wang, Chao; Xu, Nanping; Chu, Huaqiang

doi:10.1016/j.jclepro.2018.09.145

Cited by 101 publications

(20 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, the binder phase in the hardened cementitious matrix not only contains the cementitious binding material (cement or lime) but may also contain the silt 19,20 and other solid additives 21 (eg, gypsum) with similar particle size. As an example, in the cement industry, cement is dry blended with fly ash, stone wastes, and other pozzolanic materials to reduce the overall carbon footprint of cement 22‐24 .…”

Section: Introductionmentioning

confidence: 99%

Raman imaging for measuring homogeneity of dry binary blend: Combining microscopy with spectroscopy for technologists

Gupta

Pathak

Chaudhary

et al. 2020

Analytical Science Advances

View full text Add to dashboard Cite

Expanding the capabilities of Raman scattering as an analytical tool for engineering applications can optimize the technological output immensely. Understanding the homogeneity of any blended mix is one such significant parameter in the family of composite building construction materials that needs an appropriate tool for its measurement. Raman spectromicroscopy has been established here for the purpose of studying the chemical homogeneity at the microscopic scale of a dry binary blend used in the building constructions as an example. In this study, two waste stone powdered materials, obtained from western Indian stone fields, have been characterized in their respective unmixed forms using Raman spectroscopy up to an extent so that the same can be developed as a microscopic tool to clearly “see” the chemical homogeneity of a mixture. A step‐by‐step study has been carried out by first, simply making a physically separated and identifiable boundary of the two materials followed by obtaining a Raman line image. The Raman line map could clearly identify the boundary, which otherwise was not possible to appreciate visibly. The same recipe has been extended to study the homogeneity of a binary mixture (blended in 1:1 ratio), using a Raman area map. The novelty of the work lies in the advancement in the analytical tool's family to see the chemical homogeneity of building construction materials at the microscopic level. Chemical imaging using Raman spectroscopy has been demonstrated as a simple tool to understand the homogeneity of the dry binary blend, which was not possible by other simple techniques. Using Raman area mapping proves to be a quick, valuable, and effective tool for measuring the homogeneity of the blended mixes at the microscopic scale and important for application in building construction materials.

show abstract

Section: Introductionmentioning

confidence: 99%

Raman imaging for measuring homogeneity of dry binary blend: Combining microscopy with spectroscopy for technologists

Gupta

Pathak

Chaudhary

et al. 2020

Analytical Science Advances

View full text Add to dashboard Cite

show abstract

“…Moreover, it can be seen in the R-3-5 specimen that the XRD intensity of the gypsum peak was most attributed to the desulfurized gypsum, which is the main component of activated sludge [43]. Gypsum from the activated sludge accelerated the hydration reaction of the cement; thus, ettringite and C-A-H were observed in XRD [44][45][46][47].…”

Section: X-ray Diffraction Analysismentioning

confidence: 97%

Preparation and Properties of Sustainable Concrete Using Activated Sludge of Industrial By-Products

2021

View full text Add to dashboard Cite

Industrial sludge byproducts contain CaO, SiO2, Al2O3, etc. When industrial sludge is used in ready-mixed concrete, the performance of the concrete can be enhanced due to the hydration reaction. In the present study, activated sludge was used to prepare ready-mixed concrete, and its durability performance was evaluated. Once the activated sludge was used, the durability of the concrete improved. Therefore, it is suggested that activated sludge can be used in concrete mix as an admixture.

show abstract

“…In short, the research on both types of gypsums (FG and FGD gypsum) has been relatively more focused on the basis of Portland cement. Some studies [30,31] have shown that both the gypsums (FG and FGD gypsum) have a beneficial effect when used in conjunction with slag. Therefore, if the application of the two types of gypsums and alkali slag cement can be combined, the utilization rate of resources will improve, and novel ways of using these resources could be explored.…”

Section: Introductionmentioning

confidence: 99%

Effects of Fluorogypsum and Flue-Gas Desulfurization Gypsum on the Hydration and Hardened Properties of Alkali Slag Cement

Wang

et al. 2021

Crystals

View full text Add to dashboard Cite

In order to explore the influence of the types of waste gypsum on the properties of alkali slag cement, fluorogypsum (FG) and flue-gas desulfurization (FGD) gypsum were comparatively investigated. Moreover, the action mechanisms of FG and FGD gypsum on the properties of alkali slag cement were analyzed. The results show that both the FG and FGD gypsum prolonged the setting time of the alkali slag cement paste. However, the prolongation effect of FG was more pronounced than the FGD gypsum. When the compressive strength was maximum, the contents of FG and FGD gypsum were 5 and 6 wt.%, respectively. At 3 and 28 days, compared to the control sample, the compressive strengths increased by 59.3% and 24.3%, and 66.9% and 33.9%, respectively. Furthermore, the XRD, TG-DTA and SEM-EDS results showed that, with the increase in the contents of FG and FGD gypsum, ettringite was more easily produced and the hydration products were more abundant in the system. The greater the gypsum content of the paste, the less accumulated was the heat of hydration. The change of micro-structure caused by the formation of ettringite was the main reason for the difference in the properties of cement.

show abstract

Utilization of flue gas desulfurization gypsum as an activation agent for high-volume slag concrete

Cited by 101 publications

References 28 publications

Raman imaging for measuring homogeneity of dry binary blend: Combining microscopy with spectroscopy for technologists

Raman imaging for measuring homogeneity of dry binary blend: Combining microscopy with spectroscopy for technologists

Preparation and Properties of Sustainable Concrete Using Activated Sludge of Industrial By-Products

Effects of Fluorogypsum and Flue-Gas Desulfurization Gypsum on the Hydration and Hardened Properties of Alkali Slag Cement

Contact Info

Product

Resources

About