Prediction of Carbonation Progress in Concrete Containing Calcareous Fly Ash Co-Binder

Woyciechowski, P.; Woliński, Paweł; Adamczewski, Grzegorz

doi:10.3390/ma12172665

Cited by 24 publications

(14 citation statements)

References 40 publications

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“…They originated from combined heat and power plants, in which they were created as by-products of pulverized coal combustion. There are already known cases of using these waste materials in the production of composites based on cement [ 20 , 21 , 22 , 23 ] and gypsum [ 24 , 25 , 26 , 27 ]. The main chemical components of the microspheres were about 35% aluminum oxide Al 2 O 3 , and about 55% silicon oxide SiO 2 .…”

Section: Methodsmentioning

confidence: 99%

Comparison of the Thermal Properties of Geopolymer and Modified Gypsum

et al. 2021

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The paper presents the results of research concerning the influence of micromaterials on the heat conductivity coefficient λ, specifically heat Cp and thermal diffusivity a of modified gypsum and geopolymer. Microspheres, hydroxyethyl methylcellulose (HEMC) polymer, and aerogel were used as the gypsum’s modifying materials. The study also investigated an alkali potassium-activated methakaolin-based geopolymer with the addition of aluminium dust. During the measurements of thermal parameters, the nonstationary method was chosen, and an Isomet device—which recorded the required physical quantities—was used. When compared to the reference sample, a decrease in the thermal conductivity and diffusivity of the hardened gypsum— and a simultaneous increase in specific heat—was observed with the addition of micromaterials. The geopolymer sample was characterized by the lowest value of thermal conductivity, equal to 0.1141 W/(m·K). It was over 62% lower than the reference sample containing only gypsum. The experimental values of the thermal conductivity of the gypsum samples with the addition of HEMC, aerogel and microspheres were, respectively, over 23%, 6%, and 8% lower than those of the unmodified gypsum samples. The lowest values of thermal conductivity were observed in the case of the gypsum samples modified with polymer; this resulted from the fact that the polymer caused the greatest change in the structure of the gypsum’s composite, which were expressed by the lowest density and highest porosity.

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Section: Methodsmentioning

confidence: 99%

Comparison of the Thermal Properties of Geopolymer and Modified Gypsum

et al. 2021

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“…properties of modified cement matrix composites reinforced with fibers [14,[18][19][20]; • application of new types of supplementary cementitious materials [13,16,[21][22][23][24][25][26][27][28]; • characterization of various types of modified cement based materials [18,21,23,[25][26][27][28][29][30][31].…”

Section: Short Description Of the Articles Presented In This Special Issuementioning

confidence: 99%

Special Issue: Supplementary Cementitious Materials in Concrete, Part I

Fantilli

Jóźwiak–Niedźwiedzka

2021

Materials

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“…The structure will probably be more porous in concrete with fly ash and consequently, there is a greater ingress of carbon dioxide into the concrete. This may also be associated with the high dosage of fly ash used in the formulation as a partial substitute of cement [19,31,68,69].…”

Section: Carbonationmentioning

confidence: 99%

Durability and Time-Dependent Properties of Low-Cement Concrete

et al. 2020

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The sustainability concerns of concrete construction are focused both on the materials’ eco-efficiency and on the structures’ durability. The present work focuses on the characterization of low cement concrete (LCC), regarding time-dependent and durability properties. LCC studies which explore the influence of the formulation parameters, such as the W/C (water/cement ratio), W/Ceq, (which represents the mass ratio between water and equivalent cement), W/B (water/binder) ratio, and the reference curves, on the aforementioned properties are limited. Thus, several LCC mixtures were formulated considering two dosages of binder powder, 350 and 250 kg/m3, the former with very plastic consistency and the latter with dry consistency, which were combined with a large spectrum of cement replacement rates (up to 70%), through adding fly ash and limestone filler, and with different compactness levels. The main objectives were to study the influence of the formulation parameters on the properties: shrinkage and creep, accelerated carbonation and water absorption, by capillarity, and by immersion. The lifetime of structures produced with the studied LCC was estimated, considering the durability performance, regarding the carbonation effect on the possible corrosion of the steel reinforcement. LCC mixtures with reduced cement dosage and high compactness, despite the high W/C ratios, have low shrinkage and those with higher strength have reduced creep, however depending on W/Ceq ratio. Those mixtures can be formulated and produced presenting good performance regarding carbonation resistance and, consequently, a long lifetime, which is mandatory for a sustainable construction. LCC with 175 kg/m3 of cement dosage is an example with higher lifetime than current concrete with 250 kg/m3 of cement; depending on the XC exposure classes (corrosion induced by carbonation), the amount of cement can be reduced between 37.5% and 42%, since the LCC with 175 kg/m3 of cement allows reducing the concrete cover below the minimum recommended, ensuring simultaneously the required lifetime for current and special structures.

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Prediction of Carbonation Progress in Concrete Containing Calcareous Fly Ash Co-Binder

Cited by 24 publications

References 40 publications

Comparison of the Thermal Properties of Geopolymer and Modified Gypsum

Comparison of the Thermal Properties of Geopolymer and Modified Gypsum

Special Issue: Supplementary Cementitious Materials in Concrete, Part I

Durability and Time-Dependent Properties of Low-Cement Concrete

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