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Influence of Selected Admixtures on the Microstructure of Renovation Plaster Mortars

Wacław BRACHACZEK
Wacław BRACHACZEK
   | 04 apr 2019
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Pubblicato online: 04 apr 2019
Pagine: 79 - 85
Ricevuto: 18 gen 2018
Accettato: 15 feb 2018
DOI: https://doi.org/10.21307/acee-2018-040
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© 2018 Wacław Brachaczek et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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

Symbol Total porosity (% vol) Radius of capillaries (μm) Density (kg/dm3)
<0.01 0.01÷0.1 0.1–1.0 1.0–10 10–100 >100
Percentage of pore volume (%)
S1 41.6 – 4.5 15.6 32.3 34.8 12.8 1.35
S2 45.4 – 3.7 13.4 27.9 34.5 20.5 1.31
S3 52.1 – 3.2 11.9 28.9 38.7 17.3 1.11
S4 58.4 – 6.2 11.6 27.8 38.5 15.9 1.03
S5 24.5 2.3 12.7 69.7 12.7 2.3 0.3 1.55
S6 32.7 3.0 9.7 14.0 66.9 5.6 0.8 1.45

The composition of dry mixtures of plaster mortars

Components Symbols and compositions of dry mixtures, (% by weight)
S 1 S 2 S 3 S 4 S 5 S 6
Portland cement CEM I52.5 R 15 15 15 15 15 15
Quartz sand 0.0 ÷ 1.0 mm 73.66 73.36 73.15 72.34 74.69 73.84
Limestone powder 45 μm 5 5 5 5 5 5
Hydrated lime Ca (OH)2 5 5 5 5 5 5
Pearlite 1 1 1.5 2 - 0.5
HEMC (Hydroxyethyl methyl cellulose) 0.1 0.1 0.1 0.1 0.1 0.13
PVAc (Poly vinyl acetate) 0.2 0.5 0.2 0.5 0.2 0.5
Aerator 1 0.04 0.04 0.05 0.06 0.01 0.03
Aerator 2 0.005 0.01 0.005 0.01 – –
Water * 24 23 25 26 24 23
w/c 1.6 1.53 1.67 1.73 1.6 1.53
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