Influence and effectiveness of water-repellent admixtures on pozzolana–lime mortars for restoration application

Falchi, Laura; Müller, Urs; Fontana, Patrick; Izzo, Francesca Caterina; Zendri, Elisabetta

doi:10.1016/j.conbuildmat.2013.08.030

Cited by 48 publications

(24 citation statements)

References 27 publications

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“…The dosage of admixtures was chosen considering previous literature [23,24]. A reference paste series contained no water repellent.…”

Section: Preparation Of Cement Pastes For Investigation Of Their Hydrmentioning

confidence: 99%

“…Many research studies have dealt with the development of strategies to enhance the durability of cement mortars and plasters towards the resistance to the action of water, salt attack and frost attack, by reducing the water uptake through the use of water-repellent systems. Different water-repellent solutions have been investigated: i) aqueous or solvent-based water repellent systems used for impregnation treatments [15][16][17], and ii) water-repellent admixtures added directly to the mortars' formulation [18][19][20][21][22][23][24]. In the latter case, different hydrophobic compounds (as dry powder or liquid) can be selected and mixed into fresh mortar mixtures.…”

Section: Introductionmentioning

confidence: 99%

“…However, water-repellent admixtures not only reduce the water uptake of the mortar system, but they affect also the fresh and hardened mortar properties, as well as the hydration of the binder [22][23][24].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The influence of water-repellent admixtures on the behaviour and the effectiveness of Portland limestone cement mortars

Falchi

Zendri

Müller³

et al. 2015

Cement and Concrete Composites

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“…The dosage of admixtures was chosen considering previous literature [23,24]. A reference paste series contained no water repellent.…”

Section: Preparation Of Cement Pastes For Investigation Of Their Hydrmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The influence of water-repellent admixtures on the behaviour and the effectiveness of Portland limestone cement mortars

Falchi

Zendri

Müller³

et al. 2015

Cement and Concrete Composites

Self Cite

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“…Currently, only the organosilicon compounds are used for hydrophobisation concrete with Portland cement. However, the disadvantage of this hydrophobic cement is that it is very expensive [21,25,26].…”

Section: Introductionmentioning

confidence: 99%

Hydrophobic Calcium Carbonate for Cement Surface

et al. 2017

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This report describes a novel way to generate a highly effective hydrophobic cement surface via a carbonation route using sodium stearate. Carbonation reaction was carried out at different temperatures to investigate the hydrophobicity and morphology of the calcium carbonate formed with this process. With increasing temperatures, the particles changed from irregular shapes to more uniform rod-like structures and then aggregated to form a plate-like formation. The contact angle against water was found to increase with increasing temperature; after 90 • C there was no further increase. The maximum contact angle of 129 • was obtained at the temperature of 60 • C. It was also found that carbonation increased the micro hardness of the cement material. The micro hardness was found to be dependent on the morphology of the CaCO 3 particles. The rod like structures which caused increased mineral filler produced a material with enhanced strength. The 13 C cross polarization magic-angle spinning NMR spectra gave plausible explanation of the interaction of organic-inorganic moieties.

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“…A second, more effective class of admixtures, is based on water‐repellent hydrophobic compounds, normally consisting of fatty acids that inhibit wetting by increasing the wetting angle of liquid water . Such compounds are capable of providing decent waterproofing, but at the same time may alter both the rheological and mechanical properties . It has also been shown that the addition of nano‐SiO 2 and nano‐TiO 2 may enhance concrete permeability.…”

Section: Introductionmentioning

confidence: 99%

Use of nanocomposites as permeability reducing admixtures

Valentini

Ferrari²,

Russo³

et al. 2018

J Am Ceram Soc

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Permeability is one of the fundamental properties of concrete structures as it is strictly related to durability. Mitigation of the degradation processes induced by aggressive solutions can be achieved by controlling water penetration through the pore network. In this study, we test the potential use of nanocomposites as waterproofing agents in concrete. Macroscopic measurements show that the addition of a small amount of nanoparticles effectively reduces the extent of the water permeation front. A combination of experiments, based on X‐ray tomography, mercury intrusion porosimetry, and BET nitrogen adsorption, and of numerical simulations, are used to interpret the macroscopic observations. These investigations show that C–S–H precipitation away from cement surfaces, induced by the presence of nanoparticles, leads to a refinement of the pore network. Such a microstructural change in the cement matrix results in a net reduction in the overall concrete permeability.

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Influence and effectiveness of water-repellent admixtures on pozzolana–lime mortars for restoration application

Cited by 48 publications

References 27 publications

The influence of water-repellent admixtures on the behaviour and the effectiveness of Portland limestone cement mortars

The influence of water-repellent admixtures on the behaviour and the effectiveness of Portland limestone cement mortars

Hydrophobic Calcium Carbonate for Cement Surface

Use of nanocomposites as permeability reducing admixtures

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