Fly ash particle characterization for predicting concrete compressive strength

Kim, Tae‐Hwan; Davis, Jeffrey M.; Ley, M. Tyler; Kang, Shinhyu; Amrollahi, Pouya

doi:10.1016/j.conbuildmat.2018.01.059

Cited by 53 publications

(12 citation statements)

References 31 publications

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“…However, a tendency of strength increase after 28 days showed by bacterial specimens. It is in accordance with a study on fly ash concrete that the strength increased at the later age [17]. Pozzolanic reaction incorporating with the bio-cementation in concrete pores resulted in denser concrete at the later age.…”

Section: Concrete Compressive Strengthsupporting

confidence: 92%

The Effect of Microbes and Fly Ash to Improve Concrete Performance

Muhammad¹,

Ekaputri

Basoeki³

2021

JACEE

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This paper presents the application of�fly ash�combining with microbes in concrete to reduce cement content.�A class F fly ash as cement replacementwas applied with ratios of 20%, 30%, 40%, and 50% to reduce hydration heat. Microbes from bacterial consortium were applied to as the filler to increase concrete compressive strength. The concrete mix design from SNI 03�2834�2000 was applied for a compressive strength target of 30 MPa. The mechanical test was carried out consisting compressive and tensile test.�Concrete�workability�and the heat hydration measurement were performed for fresh concrete.�The results showed that the maximum strength of 45.10 MPa was obtained from specimens with 30% fly ash content.�Application of microbes associated with�fly ash content of 40% showed the maximum strength of 48.47 MPa.�It was found that the tensile strength also increased with the application of�fly ash�and microbes.�Hydration temperature of concrete decreased with the increase of�the ash�content.�This proves that the application of�fly ash�and microbes in concrete can reduce the cement as well as increasing the concrete performance.

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Section: Concrete Compressive Strengthsupporting

confidence: 92%

The Effect of Microbes and Fly Ash to Improve Concrete Performance

Muhammad¹,

Ekaputri

Basoeki³

2021

JACEE

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“…Moreover, the proportions of different compositional groups in a range of fly ashes have been shown to correlate to compressive strength development in mortar bars [116]. Blast furnace slags [117] and calcined dredging sediments [38] have also been studied by this method.…”

Section: Can Be Combined With Microchemical Analysismentioning

confidence: 99%

Supplementary cementitious materials: New sources, characterization, and performance insights

Juenger

Snellings

Bernal

2019

Cement and Concrete Research

655

171

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Conventional supplementary cementitious materials (SCMs), such as blast furnace slags or fly ashes, have been used for many decades, and a large body of knowledge has been collected regarding their compositional make-up and their impacts on cement hydration and concrete properties. This accumulated empirical experience can provide a solid, confident base to go beyond the status quo and develop a new generation of low-clinker cements composed of new types and combinations of SCMs.The need for new sources of SCMs has never been greater, as supplies of traditional SCMs are becoming restricted, and the demand for SCMs to reduce CO2 emissions from concrete production is increasing. In this paper, recent research on emerging SCM sources is reviewed, along with new developments in characterizing and qualifying SCMs for use and improved knowledge of SCMs on long-term concrete performance and durability. Keywords(B) Characterization; (C) Durability; (D) Blended Cement; (D) Filler; (D) Pozzolan Material Chemistry Used as SCM (Mt/y)Total volume est. (Mt/y) Comments Blast furnace slag Ca-Si-Al 330 300-360 Nearly fully used, latent hydraulic Coal fly ash Si-Al 330-400 700-1100 Subject to limitations on carbon content, reactivity Natural pozzolans Si-Al 75 Large accessible reserves Large variety/variability, often high water demand Silica fume Si 0.5-1 1-2.5 Used in high-performance concrete Calcined clays Si-Al 3 Large accessible reserves Metakaolin performs best, often high water demand Limestone CaCO3 300 Large accessible reserves Cementitious contribution in combination with reactive aluminates Biomass ash Si 0 100-140 Competition with use as soil amendment, high water demand, (for some: high alkali contents) MSWI bottom ash Si-Al-Ca 0 30-60 Expansive and corrosive components, leaching issues Steel slag Ca-Si-Fe 0 (negligible) 170-250 Various types, can contain expansive components (CaO) or leachable heavy C L reactivity Copper slag Fe-Si 0 (some as filler) 30-40 Low reactivity, leaching of heavy metals, more research needed Other non-ferro slags Fe-(Si)-(Ca) 0 (some as filler) 5-15 Mt/y each (FeCr, Pb, Ni) Low reactivity, leaching of heavy metals, more research needed

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“…In the last decade, FA-based alkali-activated binders have emerged as a promising new cement alternative in the field of building and construction materials [ 9 , 10 , 11 , 12 , 13 , 14 ]. The incorporation of FA not only reduces the usage of cement, but also improves the performance and quality of cement-based materials [ 15 , 16 , 17 , 18 , 19 , 20 , 21 ], and thus the applications of FA in cement-based materials have been very extensive.…”

Section: Introductionmentioning

confidence: 99%

The Relationship of Compressive Strength and Chemically Bound Water Content of High-Volume Fly Ash-Cement Mortar

Yao

Yang

et al. 2021

Materials

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Fly ash (FA) has been widely used in cement-based materials, but limited work has been conducted to establish the relationship between the compressive strength and hydration process of high-volume FA (HVFA)-cement-based material. In this study, the compressive strength and chemically bound water contents of FA-cement-based materials with different water-to-binder ratios (0.4, 0.5, and 0.6) and FA contents (0%, 30%, 40%, 50%, 60%, and 70%) were tested. Replacing more cement with FA reduced the compressive strength and of HVFA-cement-based materials. The compressive strength and chemically bound water content reduced by about 60–70% when 70% cement was replaced by FA. Water-to-binder ratio showed more significant influence on the chemically bonded water at later ages than that at early ages. Based on test results, the prediction equation of chemically bound water content was established, and its accuracy was verified. The error was less than 10%. The relationship between the compressive strength and chemically bound water content was also fitted. The compressive strength and chemically bound water content showed linear relationships for different water-to-binder ratios, hence the compressive strength of HVFA-cement mortar could be predicted with the chemically bound water content and water-to-binder ratios. The results of this study could be used for the prediction of the compressive strength development of HVFA-cement mortars, and is helpful to develop the mix design method of HVFA-cement-based materials.

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Fly ash particle characterization for predicting concrete compressive strength

Cited by 53 publications

References 31 publications

The Effect of Microbes and Fly Ash to Improve Concrete Performance

The Effect of Microbes and Fly Ash to Improve Concrete Performance

Supplementary cementitious materials: New sources, characterization, and performance insights

The Relationship of Compressive Strength and Chemically Bound Water Content of High-Volume Fly Ash-Cement Mortar

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