Properties of Concrete Utilizing Self-Cementing High-Calcium Fly Ash as Sole Binder Material

Wattimena, Oswyn Karsten; Antoni, Antoni; Hardjito, Djwantoro

doi:10.11113/jurnalteknologi.v84.17973

Cited by 3 publications

(2 citation statements)

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“…Sudimoro fly ash is classified as intermediate calcium fly ash while Paiton fly ash is classified as high calcium fly ash. The high calcium content in Paiton fly ash verifying that Paiton fly ash has self-cementing properties [28].…”

Section: Compressive Strength Developmentmentioning

confidence: 88%

The impact of calcium hydroxide addition on HVFA mortar and concrete properties

Ringu,

Andreas,

Antoni

et al. 2023

E3S Web Conf.

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Fly ash, a by-product of coal combustion, can be used as a cement substitute. High-volume fly ash (HVFA) concrete refers to fly ash substituting more than 50% of the cement. Previous research has indicated a decrease in compressive strength with an increase in fly ash content. Moreover, HVFA concrete exhibits low early strength due to the limited availability of calcium hydroxide resulting from cement hydration, which is insufficient to drive the pozzolanic reaction. This study, therefore, introduces additional calcium hydroxide to the mixture to react with class C and F fly ash in HVFA concrete. The fly ash replaces 50% and 60% of the Portland cement by mass, and the study investigates the impact of adding calcium hydroxide at 10%, 20%, and 30% of the fly ash content by mass. The addition of calcium hydroxide to the HVFA concrete mixture resulted in decreased workability and accelerated initial setting time. However, this addition did not influence the early strength of the mortar and concrete. Interestingly, it was found that the compressive strength at 28 and 56 days increased with the increase in calcium hydroxide content. The increase in later-age strength was more pronounced in HVFA concrete with class F fly ash, which can be attributed to the enhanced availability of calcium hydroxide, thereby facilitating the pozzolanic reaction.

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Section: Compressive Strength Developmentmentioning

confidence: 88%

The impact of calcium hydroxide addition on HVFA mortar and concrete properties

Ringu,

Andreas,

Antoni

et al. 2023

E3S Web Conf.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Our previous study has successfully demonstrated the self-cementing behavior of fly ash obtained from PLTU Paiton in Indonesia [13]. A very low water-tofly ash ratio has become the main key to achieving high compressive strength.…”

Section: Introductionmentioning

confidence: 99%

Long-term Mechanical Properties and Microstructure of Concrete Utilizing Self-Cementing Fly Ash as A Sole Binder Material

Wattimena,

Antoni,

Hardjito

2023

ced

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Self-cementing fly ash, containing calcium oxide (CaO) of about 20%, has successfully become a sole binder material in concrete through hydration. A very low water-to-fly ash ratio, e.g., below 0.20, is the main key to achieving the high compressive strength of concrete. This study explores the strength evolution, long-term compressive strength, and mechanical properties of concrete that utilize self-cementing fly ash as a sole binder material. Remarkably, the long-term compressive strength continues to develop over a year, reaching nearly 50 MPa at 365 days, a 34% increase from the 28-day strength. While the other mechanical properties are slightly lower than predictions from empirical formulas for Portland cement concrete, promising results are observed. Scanning Electron Microscope (SEM) images highlight surface-restricted hydration products in self-cementing fly ash, rather than full dissolution of fly ash particles.

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