Properties of Fly Ash Treated by Electrostatic Belt Separation Method

Sakai, Etsuo; Umetsu, Mamiko; Matsuzawa, Kazuki; Kuga, Ryuichiro

doi:10.14250/cement.73.65

Cited by 3 publications

(1 citation statement)

References 2 publications

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“…Another reason is that the unburned carbon content in fly ash affects the properties of concrete and makes quality control very difficult. To solve this problem, a new modified fly ash with low unburned carbon has been developed using an electrostatic belt separation method, which is a special technique using the differences in conductivity between the particles of the minerals to separate them from each other [2,3].…”

Section: Introductionmentioning

confidence: 99%

Cracking Resistance of Steam-Cured Precast Concrete Using High Alite Cement with Modified Fly Ash

Alhafez,

Miyazawa,

Nito

et al. 2023

Infrastructures

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Cement with fly ash has rarely been used in Japan, mainly because its strength development is slower than ordinary Portland cement. In this research, the effect of the new type of fly ash (which was modified by the electrostatic belt separation method) with high alite (C3S) cement on cracking resistance of precast concrete prepared by steam curing was studied. The mechanical and shrinkage properties of the proposed fly ash concrete were compared with those of concrete made using OPC cement without fly ash. In order to study the cracking tendency of precast concrete with the proposed cement with fly ash, thermal stress analysis was conducted, taking into consideration the experimental data of concrete properties with the different concrete mix proportions. A standard precast concrete box culvert model was used in this 3D FEM analysis, and the distribution of temperature and relative humidity in the cross-section and induced restraint stress during and after steam curing were discussed. Steam-cured concrete with fly ash and high alite cement developed higher compressive strength on the first day of age than concrete with OPC. The proposed fly ash concrete developed high cracking resistance in the early days. On the other hand, the results showed that the drying shrinkage at later ages was the main cause of cracking.

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Section: Introductionmentioning

confidence: 99%

Cracking Resistance of Steam-Cured Precast Concrete Using High Alite Cement with Modified Fly Ash

Alhafez,

Miyazawa,

Nito

et al. 2023

Infrastructures

Self Cite

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show abstract

Cracking Resistance of Steam-Cured Precast Concrete with Modified Fly Ash Cement

Alhafez,

Miyazawa,

Nito

et al. 2023

Preprint

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Fly ash cement has rarely been used in Japan, mainly because its strength development is slower than ordinary Portland cement. In this research, the effect of the new fly ash cement with both high alite (C3S) cement and fly ash modified by electrostatic belt separation method on cracking resistance of precast concrete prepared by steam curing was studied. The mechanical and shrinkage properties of the proposed fly ash concrete were compared with those of concrete made using OPC cement without fly ash. In order to study the cracking tendency of precast concrete with the proposed fly ash cement, thermal stress analysis was conducted taking into consideration of the experimental data of concrete properties with the different concrete mix proportions. A standard precast concrete box culvert model was used in this 3D FEM analysis and the distribution of temperature and relative humidity in cross section and induced restraint stress during and after steam curing were discussed. Steam-cured concrete with fly ash and high alite cement developed higher compressive strength on the first day of age than concrete with OPC. The proposed fly ash concrete developed high cracking resistance in the early days. On the other hand, the results showed that the drying shrinkage at later ages was the main cause of cracking.

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A Study on the Modification Condition to Remove Unburned Carbon in Fly Ash by Flotation Method and Characteristics as the Admixture for Concrete

YAMASAKI

Takasu

Suyama

et al. 2022

Nihon Kenchiku Gakkai Kozokei Ronbunshu

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Properties of Fly Ash Treated by Electrostatic Belt Separation Method

Cited by 3 publications

References 2 publications

Cracking Resistance of Steam-Cured Precast Concrete Using High Alite Cement with Modified Fly Ash

Cracking Resistance of Steam-Cured Precast Concrete Using High Alite Cement with Modified Fly Ash

Cracking Resistance of Steam-Cured Precast Concrete with Modified Fly Ash Cement

A Study on the Modification Condition to Remove Unburned Carbon in Fly Ash by Flotation Method and Characteristics as the Admixture for Concrete

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