Influence of inorganic pigments on the fluidity of cement mortars

Lee, Hyunsoo; Lee, Jae Yong; Yu, Myoung-Youl

doi:10.1016/j.cemconres.2004.06.010

Cited by 37 publications

(13 citation statements)

References 2 publications

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“…Strength tends to increase when a moderate amount of pigment is added. However, when pigments are added in large quantities, the mechanical properties are affected because the moisture content in the material decreases [19][20][21][22]. Colored concrete can be used as an alternative material in challenging architectural designs and applications for multipurpose features, including aesthetic elements.…”

Section: Introductionmentioning

confidence: 99%

Compressive-Strength Analysis of High-Strength Cementitious Composites Mixed with Red and Green Pigments

et al. 2022

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We estimate the mechanical properties of pigment-containing ultra-high-strength cement composites (UHSCCs) and the pigment-induced changes in their physical properties via thermal and X-ray diffraction analyses. Hydrates in samples are analyzed using thermogravimetry. Additionally, the change in color expression with the UHSCC age is examined via the Commission Internationale de l’ Éclairage L*a*b* analysis. Correlation analysis is performed to determine linear relationships between experimental factors by calculating R2. A change in hydrate expression is confirmed as the strength increases with age. The pigment used affects the change in hydrate expression as well as color development. Correlation analysis of the results for all ages reveals that 5% red pigment mixing yields the highest R2 of 0.9858 in intensity-a*. The case of 10% red pigment mixing yields the lowest R2 of 0.5229 in intensity-b*. According to the amount of pigment used, we believe that quantitative results can be obtained by considering L* (contrast), rather than the relationship between intensity and color components. The appropriate mixing ratio based on the intensity expression of the red pigment is 3–8%, and the green pigment intensity and strength expression are inversely proportional. Our results can serve as a guideline for the performance development of pigmented cement-based composites.

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Section: Introductionmentioning

confidence: 99%

Compressive-Strength Analysis of High-Strength Cementitious Composites Mixed with Red and Green Pigments

et al. 2022

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“…), additions rates, and dispersion can drastically alter the fresh and hardened concrete properties [9][10][11]. For instance, it is accepted that pig-ments absorb part of the free mixing water because of a significantly higher surface area (vs. cement), thus requiring increased water demand and/or high-range water reducer (HRWR) to achieve a given workability [12][13][14]. Meng et al [15] reported that the drop in fluidity due to TiO 2 can be controlled through HRWR and slag additions.…”

Section: Introductionmentioning

confidence: 99%

Effect of pigments on bond strength between coloured concrete and steel reinforcement

2022

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The effect of pigments on mechanical properties of coloured concrete intended for structural applications, including the bond stress-slip behaviour to embedded steel bars, is not well understood. Series of concrete mixtures containing different types and oncentrations of iron oxide (red and grey colour), carbon black, and titanium dioxide (TiO2) pigments are investigated in this study. Regardless of the colour, mixtures incorporating increased pigment additions exhibited higher compressive and splitting tensile strengths. This was attributed to the micro-filler effect that enhances the packing density of the cementitious matrix and leads to a denser microstructure. Also, the bond to steel bars increased with the pigment additions, revealing their beneficial role for improving the development of bond stresses in reinforced concrete members. The highest increase in bond strength was recorded for mixtures containing TiO2, which was ascribed to formation of nucleus sites that promote hydration reactions and strengthen the interfacial concrete-steel transition zone. The experimental data were compared to design bond strengths proposed by ACI 318-19, European Code EC2, and CEB-FIP Model Code.

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“…It is widely used to replace the paint and ceramic tile to ornament the external wall of building. With the aim to adjust the mortar colour, different content of pigments, such as ferric oxide, manganese oxide, chromic oxide, ochre and ultramarine, commonly have to be used in the preparation process (Lee et al, 2005;Marmol et al, 2010). As a result, the uses of these exclusive pigments definitely increase the raw material cost of decorative mortar.…”

Section: Introductionmentioning

confidence: 99%

Recycling red mud from the production of aluminium as a red cement-based mortar

Yang

Zhao

et al. 2017

Waste Manag Res

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Current management for red mud is insufficient and a new method is needed. A series of experiments have been carried out to develop a new approach for effective management of red mud. Mortars without or with 3%, 6% and 9% red mud were prepared and their fresh and hardened properties were measured to access the possibility of recycling the red mud in the production of red cement-based mortar. The mechanisms corresponding to their mechanical performance variations were explored by X-ray powder diffraction and scanning electron microscopy. The results show that the fresh mortars with red mud present an increase of viscosity as compared with the control. However, little difference is found when the content of red mud is altered. It also can be seen that red mud increases flow time and reduces the slump flow of the mortar. Meanwhile, it is found that mortar with red mud is provided with higher air content. Red mud is eligible to adjust the decorative mortar colour. Compressive strength of mortar is improved when less than 6% red mud is added. However, overall it has a slightly negative effect on tensile bond strength. It decreases the Ca(OH) content and densifies the microstructure of hardened paste. The heavy metal concentrations in leachates of mortars with red mud are much lower than the values required in the standard, and it will not do harm to people's health and the environment. These results are important to recycle and effectively manage red mud via the production of red cement-based mortar.

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Influence of inorganic pigments on the fluidity of cement mortars

Cited by 37 publications

References 2 publications

Compressive-Strength Analysis of High-Strength Cementitious Composites Mixed with Red and Green Pigments

Compressive-Strength Analysis of High-Strength Cementitious Composites Mixed with Red and Green Pigments

Effect of pigments on bond strength between coloured concrete and steel reinforcement

Recycling red mud from the production of aluminium as a red cement-based mortar

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