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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 19 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
21-298
May 1, 2022
Keikhosrow Tahmureszadeh, Medhat H. Shehata, and Bill Gong
3
The durability of three repair materials was investigated under two exposures: freezing-and-thawing cycles in the presence of deicing salts, and substrate undergoing expansion due to alkali-aggregate reaction (AAR). The bond strength of the repairs under freezing-and-thawing exposure was evaluated using slant shear, splitting tensile, and pulloff tests. Additionally, the pulloff test was implemented to investigate the bond strength of repairs undergoing expansion due to AAR. Under freezing and thawing, the substrate surface roughness was evaluated and resulted in a higher bond strength under combined shear and compression forces (slant shear test). The results for both exposures showed that the efficacy of a repair could not only be explained based on the net unrestrained length change between the repair and the substrate. While significant autogenous shrinkage of ultra-high-performance concrete (UHPC) can increase the net unrestrained length change, the strength, fibers, and high paste content of such material enhance the bond strength.
10.14359/51734614
20-196
Alexandre Rodrigue, Josée Duchesne, Benoit Fournier, and Benoit Bissonnette
Alkali-activated slag/fly ash concretes were tested regarding their resistance to freezing-and-thawing cycles and deicing salt scaling. Different fly ash contents, added water dosages, and air-entraining admixture (AEA) dosages were tested. The deicing salt-scaling resistance tests were conducted on different types of surfaces (troweled, formed, saw cut). The tested alkali-activated slag/fly ash concretes showed excellent performances to freezing and thawing (300 cycles) with statistically identical values of relative dynamic modulus of elasticity averaging 100%. The performance was also good for specimens tested without addition of AEA. However, they exhibited poor scaling resistance to deicing salts with only one mixture satisfying the 0.50 kg/m2 (0.102 lb/ft2) limit of the Bureau de normalisation du Québec (BNQ) test procedure, with a value of 0.49 kg/m2 (0.100 lb/ft2). Finished surfaces underwent more scaling than formed or saw-cut surfaces. The curing of the specimens and the scaling test itself may not be suitable to test alkali-activated concrete.
10.14359/51734600
21-192
Adi Obeidah and Hani Nassif
Structural Journal
Service life of existing post-tensioned concrete members is significantly impacted by the corrosion of its unbonded steel tendons. This deterioration, commonly initiated by the penetration of chloride ions from deicing salts or grouts, is exacerbated by increases in live and superimposed dead loads. There is a need to develop more durable and improved design alternatives with enhanced serviceability, ductility, and strength performances. This study focuses on the serviceability performance of hybrid beams prestressed using a combination of bonded and unbonded steel and carbon fiber-reinforced polymer (CFRP) tendons. Eighteen beams were tested to failure under third-point loading with emphasis on the tendon materials’ (that is, CFRP and steel) performance. Results show that hybrid beams, using CFRP as the unbonded element, are very robust prestressing systems that may achieve extended service life due to their corrosion resistance, while maintaining comparable service performance when compared to hybrid steel beams.
10.14359/51734437
18-356
September 1, 2019
Jussara Tanesi, Haejin Kim, and Ahmad Ardani
116
5
Deicing chemical solutions can profoundly affect concrete’s physical and chemical properties. It is a known fact that salt solutions are highly conductive in comparison with pure water and are expected to alter concrete’s electrical resistivity as well as other transport properties. In this study, the influence of NaCl, CaCl2, and MgCl2 on transport properties of cementitious materials was investigated. The first part of the project evaluated the continuous exposure for 1 year, while the second part evaluated the wetting-drying cyclic exposure for 6 months (27 cycles). This paper presents the results of the cyclic exposure. Results obtained with standard testing methodologies can be misleading and should be interpreted with caution because transport properties were influenced by different factors, especially the exposure history. In addition, each salt affected each individual transport property differently. Cyclic exposed samples presented similar results as those subjected to 1 year of continuous exposure.
10.14359/51716837
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