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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 88 Abstracts search results
Document:
23-055
Date:
February 8, 2024
Author(s):
Sangyoung Han, Thanachart Subgranon, Hung-Wen Chung, Kukjoo Kim, Mang Tia
Publication:
Materials Journal
Abstract:
A compressive laboratory testing program, field testing program, numerical analysis, and life-cycle cost analysis were conducted to evaluate the beneficial effects of incorporating shrinkage-reducing admixture (SRA), polymeric microfibers (PMF), and optimized aggregate gradation (OAG) into an internally cured concrete (ICC) mix for rigid pavement application. Results from the laboratory program indicate that all ICC mixes outperformed the standard concrete (SC) mix. All ICC mixes showed a decrease in drying shrinkage compared to the SC mix. Based on the laboratory program, three ICC mixes and one of the SC mixes were selected for the full-scale test subjected to a heavy vehicle simulator for accelerated fatigue testing. Extensive testing and analysis have shown that ICC mixes incorporating SRA, PMF, and OAG can be beneficially used in pavement applications to achieve increased pavement life.
DOI:
10.14359/51740564
22-105
January 1, 2023
Tsuneji Sasaki, Hiroshi Higashiyama, and Mutsumi Mizukoshi
Volume:
120
Issue:
1
Beam specimens of polypropylene fiber-reinforced concrete (PPFRC) with 1.3 vol. % having three different sizes, 100 x 100 x 400 mm, 150 x 150 x 530 mm, and 200 x 200 x 650 mm, were tested under four-point bending tests to investigate the flexural behavior (flexural and post-cracking strengths). The beam specimens were quarried from PPFRC slabs to evaluate the influence of the fiber orientation and distribution and the concrete casting and loading directions on the flexural behavior. The test results show that the difference in the fabrication methods of specimens considerably affected the flexural behavior. The flexural cracking strength was accompanied by the size effect and the post-cracking strength, significantly decreased when compared with standardized prism specimens; however, the post-cracking strength was not sensitive to the size effect. Furthermore, the pavement thickness of PPFRC was compared with that of plain concrete with the calculation using the post-cracking strength.
10.14359/51737294
22-019
November 1, 2022
Vute Sirivivatnanon, Caihong Xue, Radhe Khatri
119
6
The use of blended cements enables the production of concretes with low embodied carbon and improved resistance to chloride penetration compared to general-purpose (GP) cement concrete. This paper reports the chloride diffusion characteristics in terms of the apparent diffusion coefficient (Da), surface chloride concentration (Cs), and corresponding aging factors (a and b) of low-carbon concrete (LCC) derived from up to 9-year long-term exposure of small reinforced concrete slabs in both laboratory-simulated and field marine tidal conditions. LCC with either 30% fly ash or 50% slag provides slightly to significantly lower 28-day compressive strength than GP cement concrete at the same water-binder ratio but significantly better resistance to chloride penetration. The long-term chloride profile necessary to determine the concrete cover where the chloride threshold is reached can be determined with the Da.t0, Cs.t0, and corresponding age factors a and b, where t0 is the 1-year time of exposure. The improved resistance to chloride penetration by the use of fly ash and slag as cement replacements was largely due to their intrinsic influence on the microstructure of the concrete. The results highlight that the difference in chloride penetration arises from the change in test methods, thus the importance of calibration when data obtained from laboratory concrete were used as inputs for service-life design.
10.14359/51737226
20-481
May 1, 2022
Zhang Xingbin, Rong Hua, Zhang Zhong, Fang Sha, and Geng Yan
3
To control cracking of mass concrete slabs in nuclear power plants (NPPs), a dynamic curing technique is proposed based on the stress superposition principle and elastic assumptions. It optimizes the stress field through targeted regulation of temperature variation according to the measured elastic strain εem by flexible application of surface-protection techniques. The limit tensile strain of εem is defined as 120 με to guarantee no cracks would occur. In its application on two slabs, only one hairline vertical crack was observed when εem reached 130 με on the 12th day after casting. However, the tensile strain gradually decreased, and the crack tended to close with age. The presented technique has been verified on more than 20 NPPs throughout the continuous casting stage (and even the operation period), saving construction time in the meantime. In addition, it provides theoretical and technical guidance for further investigation of mass concrete with complicated cross-section shapes.
10.14359/51734602
20-373
January 1, 2022
Ahmed G. Bediwy, M. T. Bassuoni, Martin Beaudette, and David W. Whitmore
Zinc anodes are an effective and economical method to prevent and control the corrosion of steel bars. They supply the bars with cathodic current, which can provide corrosion protection at low current densities in the range of 0.2 to 2 mA/m2. The efficacy of zinc anodes is affected by the resistivity of concrete or cementitious repair material in which these anodes are embedded. Limited data is available on the maximum electrical resistivity of repair materials/concretes beyond which zinc anodes cannot properly function to prevent corrosion. In this study, concrete slabs were cast to simulate partial- and full-depth repair configurations. Key variables included resistivity and anode position. Resistivity of the repair section varied from 10,000 to 50,000 Ω-cm, with three anode positions: 25, 100, and 250 mm in the repair section. Analysis of data shows the effectiveness of anodes at controlling corrosion, even in repair concrete with high resistivity.
10.14359/51734298
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