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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 15 Abstracts search results
Document:
21-172
Date:
November 1, 2022
Author(s):
Goran Adil, Seyedhamed Sadati, Yifeng Ling, Peter Taylor, Kejin Wang, John T. Kevern
Publication:
Materials Journal
Volume:
119
Issue:
6
Abstract:
Penetrating sealers are one means to reduce moisture and chemical transport into concrete. However, a large variety of products are available, possessing different functional modes of action. This study investigated representative families of penetrating sealers applied to vertical, sawn faces of properly air-entrained concrete (approximately 6%) to represent field application of sealers to concrete joints. Concrete was characterized for water transport, chloride diffusion, gas permeability, frost resistance in the presence of deicing salts, and potential for oxychloride formation. The results showed that some sealers effectively reduced water absorption, prolonged time to saturation, and reduced chloride penetration. However, delayed time to critical saturation did not always result in improved frost resistance. All sealers significantly reduced the potential of oxychloride formation. The tests used for this study are broadly applicable and provide enhanced characterization for selection and application of new types of sealers and modes of action.
DOI:
10.14359/51737184
20-390
September 1, 2021
Goran Adil, John T. Kevern, and Danny X. Xiao
118
5
Penetration sealers are an economically viable technique to reduce water and aggressive substance ingress into concrete, and ultimately extend service life under harsh conditions. This paper discusses a laboratory investigation to assess the effect of rate and application timing of a variety of penetrating sealers on saw-cut concrete. Sealer types included pore lining, pore blocking, and pore refining in addition to surface coating. Testing included absorption, contact angle, and chloride-ion penetration performed on mortar and concrete specimens. Results show sealers significantly reduced water penetration, as expected, with higher rates of application generally resulting in less absorption. Two applications of sealer applied at half the recommended dosage rate produced better performance than a single application at the full dosage rate, even for hydrophobic sealers such as silane. Of the sealers tested, solvent-based and water-based produced the greatest reduction in absorption and chloride penetration. The results show that sealers applied in the appropriate condition and concentration can greatly extend the time to critical saturation by reducing the absorption rate, significantly reduce chloride ingress, and potentially increase the service life of concrete or provide extra protection.
10.14359/51732930
14-276
July 1, 2016
Cameron D. Murray, Richard A. Deschenes Jr., and W. Micah Hale
113
4
Alkali-silica reaction (ASR) is a reaction that occurs over time in concrete between the highly alkaline cement paste and reactive noncrystalline amorphous silica, which is found in many common aggregates. The reaction can lead to expansion and severe damage in concrete members. One method to mitigate ASR expansion is to use a penetrating sealer such as silane. A set of columns located in a food preparation facility was treated with silane and a complimentary laboratory study was performed. A cleaning regimen involving application of an alkaline cleaner was employed at the facility, followed by rinsing with hot, pressurized water. The purpose of this research is to evaluate the effectiveness of silane when used in this alkaline environment. The research shows that silane was effective at reducing expansion in new concrete, less so when the pH of the environment is high; other measures will be needed for previously cracked concrete.
10.14359/51688982
106-M34
May 1, 2009
Daniel Cusson and Shiyuan Qian
106
3
The performance of eight commercial corrosion-inhibiting systems was assessed in the field over 10 years on reinforced concrete barrier walls of a highway bridge that was subjected to severe environmental conditions. These systems were composed of one or more of the following components: anticorrosion concrete admixtures, reinforcement coatings, and concrete surface coatings/sealers. The field evaluation consisted of annual surveys of corrosion potential and corrosion rate, as well as visual inspections and testing of concrete cores. After 10 years, the main reinforcement of the barrier walls, at a depth of 75 mm (3 in.), was found in relatively good condition due to an initially high-quality concrete. Special bars embedded at a depth of 13 mm (1/2 in.) in the barrier walls showed signs of advanced corrosion for all systems; however, no visible signs of corrosion were found on 25 mm (1 in.) deep bars. Nondestructive corrosion evaluation over the 25 mm (1 in.) deep ladder reinforcing bars indicated that the system containing the inorganic anticorrosion admixture provided consistently lower risks of corrosion, followed by systems containing organic anticorrosion admixtures, in comparison to the control system and other systems. The low concrete permeability and different stability of the protective layer forming on the bars may explain the observed differences in the effectiveness of these systems.
10.14359/56554
98-S83
November 1, 2001
Arnol J. Gillum, Bahram M. Shahrooz, and Jeremiah R. Cole
Structural Journal
98
The bond strength between overlays and bridge decks that are sealed with epoxy resin or high molecular-weight methacrylate is evaluated through field and laboratory tests. Microsilica-modified concrete, latex-modified concrete, and super-dense plasticized concrete overlays are included in this study. Despite often stark variations in the values of bond strength obtained from different testing methods, the data universally suggest that the use of a sealer at the interface reduces the available bond strength by more than 50%. Extra surface preparation techniques, such as light sandblasting of the sealed surface or broadcasting sand over the sealed interface while the sealer is curing, are effective and simple methods for restoring a significant portion of the bond strength.
10.14359/10754
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