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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 410 Abstracts search results
Document:
23-257
Date:
August 1, 2024
Author(s):
Leigh E. W. Ayers and Isaac L. Howard
Publication:
Materials Journal
Volume:
121
Issue:
4
Abstract:
In this paper, several hundred specimens were compacted and tested to evaluate the potential of beam testing protocols to directly measure four mechanical properties from one beam. Mechanical properties measured through beam testing protocols were compared to properties of plastic mold (PM) device specimens and were found to be comparable once specimen densities were corrected. Mechanical properties were also used to quantify mechanical property relationships, often used as pavement design inputs. When compared to traditionally recommended mechanical property relationships, relationships between elastic modulus and unconfined compressive strength, as well as modulus of rupture and unconfined compressive strength, were overly conservative; however, indirect tensile strength and unconfined compressive strength relationships from the literature were accurate. This paper also assessed an elevated-temperature curing protocol to simulate later-life pavement mechanical properties on laboratory specimens. Mechanical properties of laboratory specimens that underwent accelerated curing were shown to be comparable to 10- to 54-year-old cores taken from Mississippi highways.
DOI:
10.14359/51740780
22-400
Justin Becker, M. Tyler Ley, and Daniel Cook
Pumping of air-entrained concrete can result in variable air content, which leads to possibly rejected concrete. This research used air volume, super air meter (SAM) number (AASHTO T 395), bulk freezing and thawing (ASTM C666/C666M), and hardened air-void analysis (ASTM C457/C457M) to investigate the air-void quality and freezing-and-thawing durability performance of concrete before and after pumping. The laboratory results show that the fresh-air testing measurements after pumping fresh concrete are not accurate indicators of the freezing-and-thawing resistance based on the hardened air-void analysis. However, testing fresh concrete prior to pumping is a better indicator of the freezing-and-thawing performance.
10.14359/51740774
23-055
May 1, 2024
Sangyoung Han, Thanachart Subgranon, Hung-Wen Chung, Kukjoo Kim, and Mang Tia
3
A comprehensive 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 (PMFs), and optimized aggregate gradation (OAG) into internally cured concrete (ICC) mixtures for rigid pavement applications. Results from the laboratory program indicate that all the ICC mixtures outperformed the standard concrete (SC) mixture. All the ICC mixtures showed a decrease in drying shrinkage compared to the SC mixture. Based on the laboratory program, three ICC mixtures and one SC mixture were selected for the full-scale test and subjected to a heavy vehicle simulator for accelerated fatigue testing. Extensive testing and analysis have shown that ICC mixtures incorporating SRA, PMFs, and OAG can be beneficially used in pavement applications to achieve increased pavement life.
10.14359/51740564
22-380
C. Jin, N. Jiang, H. Li, C. Liu, A. Cao, J. Wang, and X. Wen
The use of construction waste to prepare recycled micro powder can improve the use of construction waste resources and effectively reduce carbon emissions. In this paper, researchers used waste concrete processing micro powder to prepare foam concrete (FC) and quantitatively characterized the performance and pore structure of FC by scanning electron microscopy (SEM), pore and fissure image recognition and analysis system (PCAS), and mechanical property testing methods with different mixing ratios of micro powder. The results showed that the effect of single mixing of micro powder or fly ash is better than the composite mixing test, and the optimal proportion of compressive strength of single mixing of micro powder is higher than that of single mixing of fly ash. The optimum mixing ratio is 6:4 between cement and micro powder, and the best effect is achieved when the micro powder mixing amount is 40%. Single or double mixing can fill the pores between the foam and strengthen the performance of the substrate. The tests of single-mixed or compound-mixed micro powder showed that the fractal dimension decreased with the increase of porosity; when the fractal dimension of the specimen increased, the average shape factor became smaller, the compressive strength decreased, and the water absorption rate increased.
10.14359/51740703
23-093
Liang Li
Time-zero is of considerable significance for determining both deformational and mechanical properties of high-performance concrete from very early ages. In this paper, four methods for determining the time-zero are investigated comparably, including stress evolution measurement, autogenous strain method, ultrasonic testing, and temperature rate method. A critical review of the theoretical basis behind each method is presented, with emphasis on the applicability and limitations of each method. Based on a case study, the practical capabilities of all four methods for determining the time-zero of high-performance concrete with a waterbinder ratio (w/b) of 0.25 are experimentally assessed. It is found that the ultrasonic testing and temperature rate methods are better suited due to their simplicity and availability compared to the other two methods. Besides, the temperature of cement-based composites at very early ages can affect the determined values of time-zero, which needs further research.
10.14359/51740565
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