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Influence of Selected Admixtures on the Microstructure of Renovation Plaster Mortars

Architecture, Civil Engineering, Environment
Volume 11 (2018): Issue 3 (September 2018)
By:
Open Access
|Apr 2019

Figures & Tables

Figure 1.

Examples of aeration admixtures used in renovation plasters Figure 2.
Examples of aeration admixtures used in renovation plasters Figure 2.

Figure 2.

An example of a hydrophobizing admixture
An example of a hydrophobizing admixture

Figure 3.

The curves for differential pore volume distribution (Fig. 3a) and capillary volume distribution depending on their effective radii for samples S1–S4 (Fig. 3b)
The curves for differential pore volume distribution (Fig. 3a) and capillary volume distribution depending on their effective radii for samples S1–S4 (Fig. 3b)

Figure 4.

The curves for differential pore volume distribution (Fig. 4a) and capillary volume distribution depending on their effective radii for plasters of S5–S6 mortars (Fig. 4b)
The curves for differential pore volume distribution (Fig. 4a) and capillary volume distribution depending on their effective radii for plasters of S5–S6 mortars (Fig. 4b)

Figure 5.

The influence of the amount of aeration admixtures 1 and 2 on the porosity Pc (%) (Fig. 5a), pore volume distribution depending on the effective radii (Fig. 5b)
The influence of the amount of aeration admixtures 1 and 2 on the porosity Pc (%) (Fig. 5a), pore volume distribution depending on the effective radii (Fig. 5b)

Figure 6.

The impact of the amount of H1, H2 and H3 hydrophobizing admixtures on the porosity with a fixed amount of aeration admixtures 1 and 2 (0.06% and 0.01%) (Fig. 6a); comparison of the porosity of the plaster without hydrophobic admixtures with plasters containing hydrophobizing admixtures H1, H2 and H3 (Fig. 6b)
The impact of the amount of H1, H2 and H3 hydrophobizing admixtures on the porosity with a fixed amount of aeration admixtures 1 and 2 (0.06% and 0.01%) (Fig. 6a); comparison of the porosity of the plaster without hydrophobic admixtures with plasters containing hydrophobizing admixtures H1, H2 and H3 (Fig. 6b)

Porosity Pc (%), pore volume as a function of radii, as total porosity percentage (%), density (kg/dm3) of the studied plasters

SymbolTotal porosity (% vol) Radius of capillaries (μm)Density (kg/dm3)
<0.010.01÷0.10.1–1.01.0–1010–100>100
Percentage of pore volume (%)
S141.6–4.515.632.334.812.81.35
S245.4–3.713.427.934.520.51.31
S352.1–3.211.928.938.717.31.11
S458.4–6.211.627.838.515.91.03
S524.52.312.769.712.72.30.31.55
S632.73.09.714.066.95.60.81.45

The composition of dry mixtures of plaster mortars

ComponentsSymbols and compositions of dry mixtures, (% by weight)
S 1S 2S 3S 4S 5S 6
Portland cement CEM I52.5 R151515151515
Quartz sand 0.0 ÷ 1.0 mm73.6673.3673.1572.3474.6973.84
Limestone powder 45 μm555555
Hydrated lime Ca (OH)2 555555
Pearlite111.52-0.5
HEMC (Hydroxyethyl methyl cellulose)0.10.10.10.10.10.13
PVAc (Poly vinyl acetate)0.20.50.20.50.20.5
Aerator 10.040.040.050.060.010.03
Aerator 20.0050.010.0050.01––
Water * 242325262423
w/c1.61.531.671.731.61.53
DOI: https://doi.org/10.21307/acee-2018-040 | Journal eISSN: 2720-6947 | Journal ISSN: 1899-0142
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Language: English
Page range: 79 - 85
Submitted on: Jan 18, 2018
Accepted on: Feb 15, 2018
Published on: Apr 4, 2019
Published by: Silesian University of Technology
In partnership with: Paradigm Publishing Services
Publication frequency: 4 times per year
Keywords:
Microstructure of the renovation plaster mortars,
Mortars admixture,
Porosity,
Renovation plaster mortars
Related subjects:
Architecture and design,
Architecture,
Architects, buildings

© 2019 Wacław BRACHACZEK, published by Silesian University of Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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