Durability performance of Portland limestone cement mortar containing butyl and zinc stearate admixtures

Malakopoulos, Athanasios; Chatzigeorgiou, Manolis; Boukos, Nikos; Salifoglou, Athanasios

doi:10.1617/s11527-021-01638-5

Cited by 8 publications

(4 citation statements)

References 31 publications

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“…The hydrophobic action of butyl stearate has been investigated in previous studies [12][13][14] and found similar to that of soaps. During cement hydration, butyl stearate hydrolyses in the alkaline environment and produces precipitates that form hydrophobic coatings and pore blockers in the hardened concrete.…”

Section: Introductionmentioning

confidence: 82%

“…The binder and alkali content, the cement fineness, and the binder type are known parameters for governing the associated capillary stresses [64][65][66][67]. Furthermore, some admixtures may compensate for shrinkage by minimizing the moisture losses or by producing expansive compounds, resulting in an initial net volume increase in the mortar, which offsets subsequent shrinkage [12,68]. BS EN 1992-1-1 provides a method for calculating drying shrinkage based on the RH, the dimensions of the element, and the strength class of the concrete.…”

Section: Shrinkage Strainsmentioning

confidence: 99%

“…During cement hydration, butyl stearate hydrolyses in the alkaline environment and produces precipitates that form hydrophobic coatings and pore blockers in the hardened concrete. While this effect is beneficial for reducing agent movement in the pore structure, it appears to influence the shrinkage mechanism [12]. Furthermore, combinations of different types of stearates may activate chemical reactions that complicate further durability assessment.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of Durability Indicators for Service Life Prediction of Portland Limestone Cementitious Systems Produced with Permeability-Reducing Admixtures

Malakopoulos

Salifoglou

2022

Buildings

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Supplementary cementing materials (SCMs) and the challenges associated with admixture compatibility and durability performance are continuous challenges for the construction industry. Utilizing SCMs has apparent benefits in reducing the carbon footprint and improving the durability performance of concrete structures. This work investigates the performance of mortars composed of Portland limestone cement, calcium carbonate, butyl stearate, and oleic acid. The effort focuses on transport properties using electrical resistivity, chloride migration, porosity, and water permeability measurements. Then, various methods based on the last parameters are compared to assess the changes in the effective chloride diffusion coefficient and the intrinsic liquid water permeability. Measurements for drying shrinkage, thermal expansion, and compressive strength are conducted to verify durability and mechanical performance. The effect of the admixture addition on the service life of a structure fully submerged in marine exposure conditions is then evaluated using Fick’s second law of diffusion and the approach described by FIB model code 34. The results indicate that incorporating calcium carbonate, butyl stearate, and oleic acid in mortar mixtures provides enhanced durability compared to plain Portland limestone cement mortars.

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Section: Introductionmentioning

confidence: 82%

Section: Shrinkage Strainsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessment of Durability Indicators for Service Life Prediction of Portland Limestone Cementitious Systems Produced with Permeability-Reducing Admixtures

Malakopoulos

Salifoglou

2022

Buildings

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“…Researchers [18,19] determined the effect of zinc stearate and butyl stearate on shrinkage deformation and strength of concrete samples. With the introduction of butyl stearate, CS is formed, which is in the concrete mixture in the form of neoplasms that create an impermeable film around the cement grains.…”

Section: Introductionmentioning

confidence: 99%

Influence of Calcium Stearate Ca(C18H35O2)2 on the Properties of Fine-Grained Concrete

Soloviev

Shvetsova

2022

SSP

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The article presents experimental data obtained during the use of powdered calcium stearate and its suspension as bulk water repellents for fine-grained concrete. The use of powdered calcium stearate in an amount of 0.5% of the mass of cement led to an increase in air intake by 1.7 times, mobility by 8.5%, and a decrease in density by 2.5% compared to similar indicators of a concrete mixture without a water repellent. Powdered calcium stearate had no significant effect on compressive strength and flexural strength. With the introduction of CS in the form of a suspension and a powder in an amount of 0.5%, the capillary water absorption was reduced by 3 times, the water absorption by weight after the first day was 19% less than that of the samples without the additive. During the first day, water absorption for samples with a suspension of CS in an amount of 0.5% was 8.8%, for samples with CS powder - 7.6%. The highest water absorption is typical for samples without a hydrophobization and was equal to 9.3%, the lowest for samples with an CS suspension in the amount of 1.5% –4.4%. The introduction of a suspension of calcium stearate in an amount of 0.5% by weight of cement led to an increase in air entrainment by 2.1 times, a decrease in density by 4%, and a decrease in mobility by 5% compared to the samples without additive.

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Preparation and properties of ethylene–acrylic acid co polymer/Surlyn-Zn2+/zinc stearate blends ionic interlayer membrane

Luo

Wang

et al. 2022

Adv Compos Hybrid Mater

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Durability performance of Portland limestone cement mortar containing butyl and zinc stearate admixtures

Cited by 8 publications

References 31 publications

Assessment of Durability Indicators for Service Life Prediction of Portland Limestone Cementitious Systems Produced with Permeability-Reducing Admixtures

Assessment of Durability Indicators for Service Life Prediction of Portland Limestone Cementitious Systems Produced with Permeability-Reducing Admixtures

Influence of Calcium Stearate Ca(C<sub>18</sub>H<sub>35</sub>O<sub>2</sub>)<sub>2</sub> on the Properties of Fine-Grained Concrete

Preparation and properties of ethylene–acrylic acid co polymer/Surlyn-Zn2+/zinc stearate blends ionic interlayer membrane

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