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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 356 Abstracts search results
Document:
CI4610CPCstatement
Date:
October 1, 2024
Publication:
Concrete International
Volume:
46
Issue:
10
Abstract:
There has been a trend toward replacing the production of Type I/II and II/V cements with Type IL cement or portland limestone cement (PLC). PLC exhibits greater variability from source to source which can lead to challenges such as altered initial setting characteristics, variations in compressive strength gain rates, and changes in bleed rates. This necessitates adjustments to mixture designs, placing and finishing techniques, and polishing methods.
SP-363-4
July 1, 2024
Author(s):
Naveen Saladi, Chandni Balachandran, Robert Spragg, Zachary Haber, and Benjamin Graybeal
Symposium Papers
363
Corrosion of steel reinforcement is one of the primary contributing factors to bridge deck deterioration. Based on the extent of corrosion, different corrosion mitigation strategies can be used to extend the service life of a bridge deck. Bridge deck overlays are efficient tools in reducing active corrosion. While there are multiple overlay solutions that are commonly deployed, including concrete-based and polymer-based systems, ultra-high performance concrete (UHPC) overlays have gained interest from bridge owners in recent years. Another corrosion mitigation strategy is the application of corrosion-inhibiting chemicals and sealers to a concrete surface to reduce the ingress of deleterious ions. The purpose of this paper is to compare different corrosion mitigation strategies and study the effects of such techniques on the bond between the UHPC overlay and the substrate concrete. UHPC overlays were found to be effective in reducing corrosion rates by more than 50 percent. Sealers and corrosion inhibitors applied to the concrete substrate in combination with placing a UHPC overlay reduced the corrosion rates even further. However, sealers and corrosion inhibitors appeared to negatively affect bond strength, potentially increasing the likelihood of overlay delamination.
DOI:
10.14359/51742107
SP-362_27
June 11, 2024
Shizhe Zhang, Jeroen Lenderink, Marc Brito van Zijl, Vincent Twigt, Rob Bleijerveld
362
The shortage of high-quality fine aggregate as an essential component of concrete has become an emerging worldwide concern for the construction industry. Concrete typically comprises up to 30% fine aggregate, which largely influences the strength and durability of the final product. Therefore, finding suitable substitutes for natural fine aggregate has become an important aspect of current concrete research. In this study, we investigated the suitability of using remediated thermal-treated soil and tar-containing asphalt as secondary raw materials in a self-compacting concrete (SCC) mixture. The remediated materials were used as both (1) fine aggregate replacement to replace all the river sand and (2) partial filler/supplementary cementitious material (SCM) replacement. The modified Andreasen and Andersen (A&A) particle packing model was used to determine the optimal replacement level. Based on the optimal mixture design, the impact of the replacement on the fresh and mechanical properties of SCC was evaluated. Additionally, the pozzolanic reactivity of the fine fraction (<125 μm) within the secondary sand was assessed and compared to that of limestone powder. Our findings confirm that using remediated thermal-treated soil and tar-containing asphalt can produce a more circular, sustainable SCC by replacing high-quality natural sand and limestone filler and reducing the environmental impact of conventional SCC. This study contributes to finding viable alternatives to natural fine aggregate and promotes the use of recycled materials in construction.
The shortage of high-quality fine aggregate as an essential component of concrete has become an emerging worldwide concern for the construction industry. Concrete typically comprises up to 30% fine aggregate, which largely influences the strength and durability of the final product. Therefore, finding suitable substitutes for natural fine aggregate has become an important aspect of current concrete research.
In this study, we investigated the suitability of using remediated thermal-treated soil and tar-containing asphalt as secondary raw materials in a self-compacting concrete (SCC) mixture. The remediated materials were used as both (1) fine aggregate replacement to replace all the river sand and (2) partial filler/supplementary cementitious material (SCM) replacement. The modified Andreasen and Andersen (A&A) particle packing model was used to determine the optimal replacement level. Based on the optimal mixture design, the impact of the replacement on the fresh and mechanical properties of SCC was evaluated. Additionally, the pozzolanic reactivity of the fine fraction (<125 μm) within the secondary sand was assessed and compared to that of limestone powder. Our findings confirm that using remediated thermal-treated soil and tar-containing asphalt can produce a more circular, sustainable SCC by replacing high-quality natural sand and limestone filler and reducing the environmental impact of conventional SCC. This study contributes to finding viable alternatives to natural fine aggregate and promotes the use of recycled materials in construction.
10.14359/51740897
CI4601Klinger
January 1, 2024
James Klinger, Joseph F. Neuber Jr., Jeffrey Ondo, and Bruce A. Suprenant
1
Placing and finishing of concrete slabs with portland-limestone cement (Type IL cement) may create issues for some contractors, and bleeding rate is a major factor. The article discusses saw cutting, cold weather protection, post-tensioning, and form removal, as well as best practices and strategies to minimize risks during floor slab finishing and early-age, strength-critical construction with Type IL cement.
CI4409Huso
September 1, 2022
Deborah Huso
44
9
The Cube at the Technical University Dresden, Dresden, Germany, is solely constructed of carbon textile-reinforced concrete. The walls of the central, simple two-story box structure were built using insulated double-wall elements, while the ceilings were constructed with carbon textile concrete precast elements. The curved portion of the building was made by layering concrete and carbon textile and placing insulation boards between those layers.
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