Utilization of limestone powder and fly ash in blended cement: Rheology, strength and hydration characteristics

Jiang, Dan; Li, Xiangguo; Lv, Yang; Zhou, Mingkai; He, Chenhao; Jiang, Wenguang; Liu, Zhuolin; Li, Changjiao

doi:10.1016/j.conbuildmat.2019.117228

Cited by 90 publications

(40 citation statements)

References 48 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 . Similarly, in paint industries, stone waste generated from dimensional stone processing industries is used as filler based on the mineralogical characteristics.…”

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

“…During the filling and mining process, the rheological performance of the filling slurry is a key consideration for the selection of filling pump stations and pipelines. Previous experiments have shown that fly ash can improve the flow properties of the slurry in pipelines and the suspension performance of solids [21,22]. Some scholars [23,24] studied the influence of different fly ash content on the rheological properties of waste rock filling slurry and gangue filling slurry by slump test and rheological test; furthermore, the influence of the type, content, and fineness of fly ash on the rheological behavior of cement and concrete has been reported by many scholars [25].…”

Section: Introductionmentioning

confidence: 99%

Study on Rheological and Mechanical Properties of Aeolian Sand-Fly Ash-Based Filling Slurry

Shao

Wang

et al. 2020

Energies

View full text Add to dashboard Cite

Backfill mining is the most environmentally friendly mining method at present, which can effectively control the surface subsidence, improve the recovery rate, and has good social and economic benefits. The purpose of this study is to solve the environmental problems caused by solid waste, combined with the rich geographical advantages of aeolian sand in the Yushenfu mining area of China. The rheological properties of the aeolian sand-fly ash-based filling slurry with different fly ash content are studied by experiments, and the strength development law of the filling body under different age and fly ash content are studied from the macroscopic and microscopic points of view. The rheological experiments showed that the increase of the amount of fly ash has a significant effect on the thixotropy, plastic viscosity, and yield stress of the filling slurry. Additionally, rheological properties of aeolian sand-fly ash-based filling slurry conform to the Bingham model. With the increase of the amount of fly ash, the performance of the filling slurry has been significantly improved. Uniaxial test and scanning electron microscope observation showed that the influence of fly ash on the strength of the filling body was mainly reflected in the late stage of maintenance, but was not obvious in the middle stage. Fly ash particles mainly bear the role of “water reduction” and a physical filling effect, which makes the filling slurry thicker and the internal structure more closely spaced. The volcanic ash reaction of fly ash is lagging behind the hydration reaction of cement; the secondary product of the delayed reaction is filled in the pores of cement hydrates, which can greatly reduce the porosity of the backfill body and increase the later strength of the backfill body. It provides a guarantee for the safe replacement of coal pillars in the working face.

show abstract

“…PHS particles with a high fineness tend to fill the inter pores caused by the packing of relatively coarser cement particles52 . These super fine PHS particles could also provide a large number nucleation sites for the precipitation of hydration products such as Ca(OH)2 and C-S-H, thus accelerating the cement hydration and filling the pores in concrete53 . The other is the amorphization phenomenon during grinding.…”

mentioning

confidence: 99%

Effects of Fineness and Content of Phosphorus Slag on Cement Hydration, Permeability, Pore Structure and Fractal Dimension of Concrete

et al. 2021

View full text Add to dashboard Cite

The utilization of phosphorus slag (PHS) to replace the fly ash in the construction of hydraulic projects has attracted a growing attention in China. In this study, the influence of PHS fineness and content on cement hydration, mechanical strength, permeability as well as the pore structure and fractal dimension (Ds) of concrete have been discussed. The results indicate that the PHS addition retards the cement hydration and hence decreases the hydration heat within 3 days. The incorporation of PHS with a Blaine specific surface area of 505 m 2 /kg (PHS) could participate in the early pozzolanic reaction and consequently offsets the retarding effect to some extent. The incorporation of 20-40 w% PHS declines the early strength of concrete, but this reduction effect on strength can be eliminated to some degrees by mechanically grinding the PHS. The compressive strengths of concrete added with PHS with a high fineness of 505 m 2 /kg

show abstract

Utilization of limestone powder and fly ash in blended cement: Rheology, strength and hydration characteristics

Cited by 90 publications

References 48 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

Study on Rheological and Mechanical Properties of Aeolian Sand-Fly Ash-Based Filling Slurry

Effects of Fineness and Content of Phosphorus Slag on Cement Hydration, Permeability, Pore Structure and Fractal Dimension of Concrete

Contact Info

Product

Resources

About