Investigation on grinding impact of fly ash particles and its characterization analysis in cement mortar composites

Krishnaraj, L.; Ravichandran, P. T.

doi:10.1016/j.asej.2019.02.001

Cited by 53 publications

(24 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In addition, concrete has been produced with traditional supplementary cementitious materials (SCMs) that possess a high pozzolanic activity [10], such as fly ash (FA) [11][12][13][14], silica fume (SF) [15][16][17] and ground granulated blast slag (GGBS) [2,[18][19][20][21] that yielded notable improvement in strength and durability. Numerous industrial solid by-products containing calcareous siliceous, and aluminous materials (fly ash, ultrafine fly ash, silica fume, etc.…”

Section: Introductionmentioning

confidence: 99%

End-of-Life Materials Used as Supplementary Cementitious Materials in the Concrete Industry

et al. 2020

View full text Add to dashboard Cite

A sustainable solution for the global construction industry can be partial substitution of Ordinary Portland Cement (OPC) by use of supplementary cementitious materials (SCMs) sourced from industrial end-of-life (EOL) products that contain calcareous, siliceous and aluminous materials. Candidate EOL materials include fly ash (FA), silica fume (SF), natural pozzolanic materials like sugarcane bagasse ash (SBA), palm oil fuel ash (POFA), rice husk ash (RHA), mine tailings, marble dust, construction and demolition debris (CDD). Studies have revealed these materials to be cementitious and/or pozzolanic in nature. Their use as SCMs would decrease the amount of cement used in the production of concrete, decreasing carbon emissions associated with cement production. In addition to cement substitution, EOL products as SCMs have also served as coarse and also fine aggregates in the production of eco-friendly concretes.

show abstract

Section: Introductionmentioning

confidence: 99%

End-of-Life Materials Used as Supplementary Cementitious Materials in the Concrete Industry

et al. 2020

View full text Add to dashboard Cite

show abstract

“…Therefore, using aeolian sand and fly ash as the filling materials can not only reduce the amount of waste disposal and disposal costs, but also save cement and reduce the filling cost [12]. Engineering practice has proven that adding fly ash to structural concrete can improve concrete performance, increase concrete strength in the later period, increase the compactness and resistance to concrete, reduce the shrinkage of concrete [13][14][15][16][17], and bring good economic and social benefits [18][19][20]. Therefore, aeolian sand and fly ash are some of the more cost-effective paste filling materials in the Yushenfu mining area, China.…”

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

“…However, the properties of the fly ash particles were not studied with DDIP, and we used fly ash in some of the experiments. Fly ash particles are known to be highly spherical [17,56,57], and according to the data sheet of the manufacturer, 87% of fly ash particles passed the 45-micron sieve.…”

Section: Particle Size Shape and Initial Water Contentmentioning

confidence: 99%

A Porous Stone Technique to Measure the Initial Water Uptake by Supplementary Cementitious Materials

et al. 2021

View full text Add to dashboard Cite

The decades-long use of supplementary cementitious materials (SCMs) as replacements for ordinary Portland cement (OPC) by the cement and concrete industry is undergoing a resurgence in research activities related to goals addressing circular economy activities, as well as reduction in CO2 emissions. Differences in the chemistry, mineralogy and reactivity of SCMs compared to OPC impact the fresh properties of concrete. Some SCMs exhibit greater initial water uptake and thus compete strongly with OPC for water during hydration. This study focuses on the early interaction with water as a primary factor that determines the resulting fresh properties and workability. Currently, no test (standard or otherwise) is available for quantifying initial interactions between water and cementitious materials. A quick and reliable method to measure the initial water uptake of SCMs is presented herein, which relies on their affinity to water. The method enables the calculation of water-to-binder ratios for different SCMs required to achieve the same workability as a reference OPC. The results are then well correlated to measured slump and bleed properties. We propose this simple technique to be used by researchers and industry practitioners to better predict the fresh properties of concretes, mortars, or pastes with SCMs.

show abstract

Investigation on grinding impact of fly ash particles and its characterization analysis in cement mortar composites

Cited by 53 publications

References 28 publications

End-of-Life Materials Used as Supplementary Cementitious Materials in the Concrete Industry

End-of-Life Materials Used as Supplementary Cementitious Materials in the Concrete Industry

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

A Porous Stone Technique to Measure the Initial Water Uptake by Supplementary Cementitious Materials

Contact Info

Product

Resources

About