Characterisation and control of cementitious mixes with colour pigment admixtures

Heerah, M.; Galobardes, Isaac; Dawson, Graham

doi:10.1016/j.cscm.2021.e00571

Cited by 5 publications

(3 citation statements)

References 51 publications

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“…However, distinct from the R0 control sample, the FA-doped R1, R4, and R7 samples exhibited crystal phases of calcite (CaCO 3 ) and mullite (Al 6 Si 2 O 13 ) in addition to these primary phases [66,67]. Further, the YP and RP-doped R4 and R7 samples showcased crystal phases of goethite (FeOOH) and hematite (Fe 2 O 3 ), respectively, alongside the earlier mentioned phases [68,69]. Following exposure to 800 • C, a substantial decrease in C-S-H peaks was evident across all samples, while quartz and mullite peaks exhibited relatively higher intensities.…”

Section: Xrd Analysismentioning

confidence: 92%

Evaluating Sustainable Colored Mortars Reinforced with Fly Ash: A Comprehensive Study on Physical and Mechanical Properties under High-Temperature Exposure

Akbulut,

Guler,

Osmanoğlu

et al. 2024

Buildings

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This research primarily delves into a comprehensive investigation concerning the synergistic effects of fly ash (FA) with yellow pigment (YP) and red pigment (RP) in the workability, physical characteristics, and mechanical properties of colored mortars, both pre-and post-exposure to high temperatures. Within the experimental design, FA was employed as a 20% substitute for cement, while YP and RP were systematically incorporated into the cement mixtures at varying concentrations (1%, 3%, and 5% by weight). The specimens underwent controlled exposure to high temperatures, ranging from 300 °C to 800 °C. This study’s outcomes unveiled that while the introduction of FA positively influenced mortar workability, including YP and RP adversely impacted spreading diameters (SD), resulting in a discernible reduction in overall workability. Despite these effects, FA emerged as a pivotal factor to enhancing the residual compressive strength (RCS) and residual flexural strength (RFS) of the colored mortars. For instance, after 90 days at 800 °C, the control concrete (R0) exhibited a notable 66.13% decrease in RCS, and the sample solely incorporating FA (R1) demonstrated a reduced reduction of 55.39%. Similarly, mortars with YP additives (R2–R4) and RP additives (R5–R7) showcased RCS reductions within the range of 53.32% to 55.12% and 54.51% to 56.04%, respectively.

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Section: Xrd Analysismentioning

confidence: 92%

Evaluating Sustainable Colored Mortars Reinforced with Fly Ash: A Comprehensive Study on Physical and Mechanical Properties under High-Temperature Exposure

Akbulut,

Guler,

Osmanoğlu

et al. 2024

Buildings

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“…In samples A1-A5, B1-B5, and C1-C5, the clinker colour gradually changed from dark green to yellow-green as the alkali content increased. Cr(III) oxide was dark green, and Cr(VI) oxide was yellow [39,40]. Thus, it is clear that the proportion of Cr(III) oxidised to Cr(VI) increases in samples A1-A5, B1-B5, and C1-C5.…”

Section: Influence Of the Alkali Content On The Total Cr(vi) In Cementmentioning

confidence: 95%

Effects of Alkali on Water Soluble Hexavalent Chromium in Ordinary Portland Cement

Shi

Jiang²,

Ji³

et al. 2022

IJERPH

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Due to the toxicity and mobility of chromium, the disposal of chromium-containing waste is a pressing issue. Co-processing of chromium-containing waste in a cement kiln is currently one of the most effective methods. However, the presence of water-soluble hexavalent chromium (Cr(VI)) in cement limits the use of this method. In this study, Na2CO3 was used to simulate alkali in industrial raw materials to investigate the pattern of influence of alkali content on water-soluble hexavalent chromium. The mechanisms associated with the oxidation and dissolution of chromium were investigated using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and inductively coupled plasma emission spectrometry (ICP-OES). The proportion of Cr(VI) in the clinker detected by XPS increased rapidly with increasing alkali content. In the cement slurry system, alkali promotes more hexavalent chromium leaching by influencing pH and other ion concentrations (Ca2+, SO42−). Therefore, the addition of alkali to either the raw meal or to the cement slurry system will favour an increase in the water-soluble Cr(VI) content. This study may provide theoretical guidance for the preparation and use of clinkers containing chromium.

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“…Studying yellow and red iron oxide pigments, Assaad et al [89] observed higher rheological properties with increasing contents due to a higher packing density and interparticle links in the matrix. Heerah et al [92] identified an important problem concerning cobaltous aluminate green pigments, which had impurities within their composition that affected the mortars' performance; therefore, the necessity of the previous characterization of the pigments must be highlighted.…”

Section: Overview Of Pigments In Mortarsmentioning

confidence: 99%

TiO2-Based Mortars for Rendering Building Envelopes: A Review of the Surface Finishing for Sustainability

Bersch,

Picanço Casarin,

Maia

et al. 2023

Sustainability

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Building envelopes coated with TiO2-based mortars benefit from depolluting, antibiological and self-cleaning effects. Therefore, photocatalytic renders are allies in the quest for sustainability in the built environment, potentially combatting atmospheric pollution, enhancing durability and reducing maintenance needs. Surface finishing characteristics of the renders influence their photocatalytic efficiency and esthetic and functional properties. In this context, this study reviews the existing literature, focusing on proven surface-affecting parameters, the surface and color of TiO2-based mortars, to explore their impacts on photoactive behavior. The incorporation of TiO2 within an additional surface layer and its mixture into the mortar in bulk were observed for surface roughness. Mainly the addition of TiO2 during casting was identified in colored mortars. Generally, a moderate surface roughness led to better photoactivity; microroughness affected self-cleaning by facilitating dirt deposition. The interaction between the surface roughness and the photocatalytic layer affected the water contact angle, regarding superhydrophilicity or superhydrophobicity. The photoactivity of colored mortars with TiO2 depended on the color and amount of the added pigments, which influenced electron–hole recombination, physically occupied active sites or, on the other hand, led to a higher formation of reactive radicals. Surface finishing can thus be designed to enhance the photoactivity of TiO2-based mortars, which is fundamental for current climate concerns and emphasizes the need for life cycle assessments and environmental protection.

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Characterisation and control of cementitious mixes with colour pigment admixtures

Cited by 5 publications

References 51 publications

Evaluating Sustainable Colored Mortars Reinforced with Fly Ash: A Comprehensive Study on Physical and Mechanical Properties under High-Temperature Exposure

Evaluating Sustainable Colored Mortars Reinforced with Fly Ash: A Comprehensive Study on Physical and Mechanical Properties under High-Temperature Exposure

Effects of Alkali on Water Soluble Hexavalent Chromium in Ordinary Portland Cement

TiO2-Based Mortars for Rendering Building Envelopes: A Review of the Surface Finishing for Sustainability

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