Effects of the use of agricultural ashes, metakaolin and hydrated-lime on the behavior of self-compacting concretes

Diniz, Hugo Alessandro Almeida; Anjos, Marcos Alyssandro Soares dos; Rocha, Aretuza K. A. da; Ferreira, Ruan L.S.

doi:10.1016/j.conbuildmat.2021.126087

Cited by 28 publications

(13 citation statements)

References 63 publications

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“…Otros como el recalcinado, molido o cribado (aberturas de mallas mayores a No. 200) no son suficientes para corregir los problemas de trabajabilidad; no obstante, las propiedades mecánicas y de durabilidad no se ven afectadas, y en ocasiones mejoradas (Zareei and Bahrami 2018, Bheel et al, 2022, Diniz et al, 2022 A pesar de su simpleza y baja demanda energética, el cribado de la CBC por la malla No. 200 o de menor abertura ha demostrado no causar efectos perjudiciales en las propiedades generales de morteros y concretos (Arenas et al, 2016, Batool et al, 2020.…”

Section: Uso De La Cbc Para La Manufactura De Morteros Y Concretosunclassified

Memorias del X Congreso Nacional de Alconpat México 2022

Borges¹,

Guzmán²,

López³

2023

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Alconpat México fue creada en abril del año 2002. Fue la primera delegación de Alconpat Internacional. Desde aquella época, y en cada año par, se ha llevado a cabo el Congreso Nacional de Alconpat México, que de cariño es llamado el Pre-Conpat. Desde aquel entonces, numerosas delegaciones nacionales se han creado año con año. En esta ocasión el comité organizador quizo hacer una celebración académica por los primeros 20 años. Esto implicó darle al congreso una imagen mística que incluye la presentación de una obra alusiva del famoso pintor Guido Farina y que engalana este libro de memorias. La obra consiste en una mano que evoca el mando de las diferentes directivas bajo la tutela del consejo fundador ilustrado con los nombres de las personas de éste en la forma de un halo. La mano sostiene una brújula que indica el camino de nuestra asociación, donde se encuentra el logo de Alconpat México y un Katun maya que representa el número 20, alusivo al 20 aniversario. Estamos muy contentos de compartir contigo ésta celebración académica.

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Section: Uso De La Cbc Para La Manufactura De Morteros Y Concretosunclassified

Memorias del X Congreso Nacional de Alconpat México 2022

Borges¹,

Guzmán²,

López³

2023

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“…The decrease of WA is mainly contributed to the higher compaction effect by higher surface area or fineness of the OSP particles which reflected positively on the results of WA, where it reduced the pore volume of the hardened cement pastes [52,53]. The increase of WA is essentially attributed to the large deficiency of the main binding material [54,55]. Consequently, the greater amount of this waste must be avoided.…”

Section: Fig 1 -Water Of Consistency and Setting Time Of The Various ...mentioning

confidence: 99%

“…The total porosity of the reference (S0) at any curing time was decreased with the increase of OSP content, but only up to 16 % (S4), and then reincreased with any further increase of OSP (S5). The decrease of total porosity is primirily attributed to the hydration of the main phases of the cement, and moreover it is due to the pozzolanic activity of GbfS and MK [55][56][57][58]. In addition to the pozzolanic reactivity of OSP with the resulting Ca (OH)2 coming from the normal hydration process of the silicate phases of the cement (C3S and β-C2S) forming additional CSHs that precipitated into the pore structure.…”

Section: (C) Total Porositymentioning

confidence: 99%

“…Furthermore, the increase of the compressive strength is also attributed to the filling performance and pozzolanic reactivity of GbfS, MK and OSP materials [44,[51][52][53][54], while the decrease of compressive strength may be contributed to the detrimental characteristics of the very high specific surface area of OSP waste that created the agglomeration of the cement particles. This worse performance effect is associated with the lower cement content that influences the direct reduction of the primary hydration products responsible to improve the compressive strength (CSH) and its negatively reflection on the rate of Ca 2+ release that delaying the precipitation of calcium hydroxide [55]. Therefore, it reduces its availability for the development of pozzolanic reactions with the OSP waste particles.…”

Section: Compressive Strengthmentioning

confidence: 99%

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Utilization of Oyster Shell Powder for Hydration and Mechanical Properties Improvement of Portland Cement Pastes

Darweesh¹

2023

JSMPM

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Supplementary cementitious materials (SCMs) are usually partially substituted at the expense of Portland cement (OPC) to reduce, as possible, the CO2emission. There has been limited studies involved the use of Oyster shell (OS) to replace OPC. The current study investigated the properties of a ternary base batch containing Oyster shell powder (OSP).The ternary cement batch was consisting of OPC, granulated blast furnace slag (GbfS) and metakaolin (MK). The results indicated that the water consistency and setting times (initial and final) are gradually increased. The water absorption and total porosity are decreased, while the bulk density and combined water content increased. This behaviour continued up till 16 % OSP content, but then reverse was obtained with any further increase of OSP content. The same trend was achieved with the compressive strength. The addition of OSP often formed mono-and/or hemicarbonate instead of monosulfate because it is mainly composed of carbonates, and moreover it is stabilizing the formation of trisulphate or ettringite in the hydrated samples. The decrease is not the decrease of free lime contents proved that the OSP is a pozzolanic material. This was confirmed by FT-IR spectra. From the results it could be concluded that the optimum content of OSP was at most 16 %.

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“…Compared to normal vibrated concrete, self-compacting concrete (SCC) contains a much higher amount/volume of fine particles (≤0.125 mm) needed to achieve mix stability or cohesion. A high percentage of fine particles in SCC is usually achieved by using mineral additives (pozzolanic and non-pozzolanic) such as fly ash, slag, silica fume, limestone, metakaolin, etc., since the use of cement alone as fines results in high production costs [ 7 , 8 , 9 ]. While the addition of mineral additives usually results in high quality and dense microstructure, which has a positive effect on mechanical properties and durability, this compact microstructure results in adverse effects in the concrete at elevated temperatures, as permeability is reduced so that moisture cannot escape as easily, and high stresses are generated [ 10 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Residual Compressive Behavior of Self-Compacting Concrete after High Temperature Exposure—Influence of Binder Materials

et al. 2022

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This paper presents an experimental investigation of the compressive behavior of high-strength self-compacting concrete exposed to temperatures up to 600 °C. Ten different concrete compositions were tested, in which part of the cement (by weight) was replaced by three different mineral additives (5–15% metakaolin, 20–40% fly ash and 5–15% limestone). The stress–strain curves, compressive strength, modulus of elasticity and strain at peak stress were evaluated from uniaxial compression tests. Scanning electron microscope micrographs were also taken to evaluate the damage caused by the high temperatures. A sharp decrease in mechanical properties and an increase in peak strain were observed already after 200 °C for all mixes tested. The different mineral additives used in this study affected the variations of residual compressive strength by 24% and peak strain by 38%, while the variations of residual modulus elasticity were 14%. Comparing the obtained results with the recommendations for compressive strength given in regulatory code EN 1992-1-2 for high strength concrete, it can be concluded that the strength loss observed in EN 1992-1-2 at temperatures up to 400 °C is too conservative. The Popovics model for the relationship between stress and strain provided a good approximation for the experimentally determined stress–strain curves at different temperatures.

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Effects of the use of agricultural ashes, metakaolin and hydrated-lime on the behavior of self-compacting concretes

Cited by 28 publications

References 63 publications

Memorias del X Congreso Nacional de Alconpat México 2022

Memorias del X Congreso Nacional de Alconpat México 2022

Utilization of Oyster Shell Powder for Hydration and Mechanical Properties Improvement of Portland Cement Pastes

Residual Compressive Behavior of Self-Compacting Concrete after High Temperature Exposure—Influence of Binder Materials

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