Concrete protection using acrylic latex paints: Effect of the pigment volume content on water permeability

Uemoto, Kai Loh; Agopyan, Vahan; Vittorino, Fúlvio

doi:10.1007/bf02480508

Cited by 10 publications

(3 citation statements)

References 5 publications

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“…Researchers have focused intensely on coating materials and pore blockers, in their studies, in the last decade . Although they form an impervious barrier on the surface of concrete, they lock moisture inside the concrete, if they were used in wet conditions, leading to continuous degradation of their protective layer, by the vapor formed inside concrete and internal vapor pressure .…”

Section: Introductionmentioning

confidence: 99%

Development of hydrophobic concrete by adding dual‐crystalline admixture at mixing stage

Al‐Kheetan

Rahman

Chamberlain

2018

Structural Concrete

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A novel approach has been presented to add a dual-crystalline hydrophobic admixture in fresh concrete for improving hydrophobicity against chloride and harmful chemicals. Dual-crystalline material can utilize water of the fresh concrete to form crystals, but the challenge is to maintain adequate hydration and strength while improving hydrophobicity. This study presents the results from a comprehensive laboratory investigation on the application of 1, 2 and 8% of crystallizing aqueous and cementitious hydrophobic mineral in fresh concrete. Despite the high slump in the fresh mixture, no segregation was observed in the matured concrete. There was a marginal reduction of strength when a high percentage of admixture was used. Despite this, significant reduction of water absorption was observed indicating greater hydrophobicity. The optimum performance was found in mixtures with 2% admixture. Mixture with 2% aqueous hydrophobic admixture revealed marginal strength gain compared to 2% crystalline cementitious hydrophobic admixture, although water protection appears to be better in cementitious mixture.admixture, compressive strength, crystal structure, fresh concrete, hydrophobic treatment, permeability, water absorptionAlthough concrete is known for its long serviceability, its performance could be greatly compromised when exposed to a harsh environment like bridges, concrete pavements, and coastal defenses. The deterioration is mainly caused by excessive water, chloride penetration and attack by other harmful substance like chemicals, fuel spillage, etc. In the United Kingdom, for example, there are about 61,000 highways and bridges, most of them are reinforced concrete pavements with reinforced steel, their maintenance expenses reached more than £4 billion in the period 2012-2013. 1,2They are subjected to rainfall of 1,420 mm as recorded in the year 2012, and about 1,120 mm in 2014. 3,4 The easy entrance of water into concrete can produce many disadvantages affecting its desired performance and durability and could bring many problems into being; including corrosion of the embedded steel, and leakage. Also, some waterassociated issues like freezing and thawing could drag concrete to a series of deterioration stages. 5 Reflecting the need to protect concrete from moisture damages and to decrease its permeability without compromising its strength, the research presented in this study jumps from the improper performance and benefits of in situ protection. Also, it is worth mentioning that there is a need to get over the fact of insufficient penetration of protection materials in concrete and try to develop a way of application on concrete so that it will cover the whole mass of concrete. 3 The purpose of this study is to investigate the performance of a crystallizing material mixed at mixing stage, in different percentages, within the concrete mixture.Discussion on this paper must be submitted within two months of the print publication. The discussion will then be published in print, along with the authors' closure, i...

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Section: Introductionmentioning

confidence: 99%

Development of hydrophobic concrete by adding dual‐crystalline admixture at mixing stage

Al‐Kheetan

Rahman

Chamberlain

2018

Structural Concrete

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“…Additionally, they resist the penetration of liquid water, vapor transfer, ultraviolet (UV) radiation, and alkalinity (Morais, 2019 [17]). When comparing PVA and acrylic paints, the pigment volume content (PVC), representing the volume of pigment in the dry paint film relative to the total volume of the dry film [18], may be responsible for variations in properties. Higher PVC results in increased permeability and reduces gloss in the paint film [18].…”

Section: Introductionmentioning

confidence: 99%

“…Seven different paint configurations were investigated, including PVA latex, matte acrylic, silicate, and lime-based paints readily available in the Brazilian market. In the case of acrylic paints, the focus was on matte finishing due to the probable higher PVC than satin acrylic paints [18]. This detailed approach aims to significantly contribute to the practices of maintenance and conservation of historic facades, addressing different suppliers and application methods that respect and preserve the heritage value of buildings.…”

Section: Introductionmentioning

confidence: 99%

Performance and Durability of Paints for the Conservation of Historic Façades

Melo,

Falcão,

Bersch

et al. 2024

Buildings

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This paper analyzes the performance of various types of paints available in the Brazilian market, including PVA, matte acrylic, silicate, and lime paints within the context of their applicability to the conservation of historic building facades. Considering distinct suppliers and application methods, this study highlights the importance of tailoring paint selection to the preservation requirements of historic edifices, taking into account local preservation norms and the material characteristics of the buildings’ original construction. The paints were evaluated based on water vapor permeability, washability, and adhesion. Furthermore, the paints’ color variation with exposure to accelerated artificial aging was assessed. For testing purposes, specimens produced from cellular concrete slabs were used as substrates, which were coated with the paints under study. Based on the results, it was observed that, regarding the diffusion of water vapor, the silicate and lime paints presented the highest permeability values, and the acrylic and PVA paints had the lowest. Concerning washability, the silicate and lime paints showed the greatest wear. The adhesion tests revealed that, except for lime paint, detachment often occurred at the substrate. As for the accelerated aging test, lime paint exhibited the most significant color variation, losing its pigmentation considerably over time. With the results of this research and considering the main preservation requirements of historic coatings, silicate-based paints may be considered the most suitable.

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