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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 13 Abstracts search results
Document:
20-219
Date:
July 1, 2021
Author(s):
R. V. M. Toffolo, T. K. Moro, D. H. Santos, L. C. B. Costa, J. C. Mendes, and R. A. F. Peixoto
Publication:
Materials Journal
Volume:
118
Issue:
4
Abstract:
This work evaluates the technical feasibility of a roller-compacted concrete (RCC) pavement with complete replacement of natural aggregates by electric arc furnace slag (EAFS) or basic oxygen furnace slag (BOFS). The methodology includes, initially, the processing of the slags, and physical, chemical, and environmental characterization of the natural and slag aggregates. Subsequently, concrete mixtures were designed, and the compaction at optimum moisture was performed. Finally, the behavior of specimens under service and their mechanical performance were evaluated. Results show that both EAFS and BOFS enhance the RCC’s compressive strength and modulus of elasticity. The RCC produced with BOFS aggregates presented some expansibility due to its high contents of chemically active finer-than-75-µm materials and higher porosity. The EAFS aggregate was stable in durability analysis. In conclusion, through optimal mixture proportions and using compatible energy compression, it is viable to produce pavements with EAFS steelmaking slag in efficient, economical, and environmentally friendly manners. BOFS also showed promising results but requires further investigation.
DOI:
10.14359/51732791
17-194
March 1, 2018
George J. Zimmer, Robert Flynn, Eric Musselman, and Jeremy Young
115
2
Roller-compacted concrete (RCC) is often used to construct hydraulic structures, and in gravity dam applications, a facing system is required to control seepage along lift lines. One facing system that is gaining popularity is grout-enriched RCC (GERCC). This innovative process requires the addition of a neat cement grout to the uncompacted RCC along the face, followed by internal vibration to combine the material. One limitation of GERCC is previous research has shown difficulty in entraining air in this system. This study optimized the grout formulation to develop a stable air void system, and then evaluated the effect of this grout on the freezing-and-thawing resistance of GERCC produced both in the lab and during a field trial. Additionally, various grout placement techniques, grout dosages, and vibration levels were evaluated. The results show that freezing-and-thawing-resistant GERCC can be created when the grout and RCC are thoroughly combined.
10.14359/51701236
15-190
July 1, 2017
Ziyad Majeed Abed and Abeer Abdulqader Salih
114
Roller-compacted concrete (RCC) is concrete that has no slump, no forms, no reinforcing steel, no finishing, and is wet enough to support compaction by vibratory rollers. Due to the effectiveness of curing on properties and durability, the essential aim of this research is to study the effect of various curing methods (air curing, 7 days of water curing, emulsified asphalt curing, and permanent water curing) and porcelanite (lightweight aggregate used as an internal curing agent) with different replacement percentages of fine aggregate (volumetric replacement) on RCC and to explore the possibility of introducing practical RCC for road pavement with a minimum requirement of curing. Specimens were sawed from slabs of 14.96 x 14.96 x 3.94 in. (380 x 380 x 100 mm). Results show that using 5% porcelanite improved RCC (with air curing) as compared to reference RCC (with permanent water curing) by percentages ranging from 0.4 to 1.7, 3.6 to 28.9, and 15.9 to –41.3% for bulk density, flexural strength, and water absorption, respectively
10.14359/51689775
100-M01
January 1, 2003
Jittbodee Khunthongkeaw and Somnuk Tangtermsirikul
100
1
During recent years, fly ash concrete has become popular in the concrete industry in Thailand, with its expected consumption in the year 2001 exceeding 1.2 million tons from the total annual production of about 3 million tons. Recently, a huge roller-compacted concrete (RCC) project (Ta Dan Dam) was started in Thailand—the volume was considered the current largest in the world at 5,000,000 m3. One of the main problems still concerns the mixture proportioning, however. Various parameters influencing the consistency of RCC are used for predicting its consistency. Those parameters are the ratio of paste volume-to-void content of densely compacted aggregate phase, free water content, and physical properties of solid materials. A model for predicting Vebe time of RCC was formulated and verified with the actual results. It was found that this model could be used to predict the Vebe time of RCC with satisfactory accuracy.
10.14359/12457
95-M23
May 1, 1998
Nader Ghafoori and Yuzheng Cai
95
3
Laboratory-made roller compacted concretes with various combinations of cement (Type I and Type V for sulfate-resistant concrete), lignite dry bottom ash, and crushed limestone coarse aggregate were tested to ascertain the suitability of this type of concrete for pavement applications. The fresh properties and strength and deformation of the hardened roller compacted concrete (RCC) containing bottom ash have been discussed in the companion article (Part I). This paper describes the data pertaining to long-term durability of bottom ash roller compacted concretes. The analysis of the test results leads to the conclusions that durable concrete can be produced with the high-calcium dry bottom ash used in this investigation. Resistance to sulfate attack, rapid freezing and thawing, and wear improved with increases in cement and/or coarse aggregate contents. Length change due to external sulfate attack varied from 0.0203 to 0.0388 percent, whereas no mass loss or reduction in strength were found in any of the test samples. Abrasion testing under wet conditions was consistently worse than under dry conditions. After 300 rapid freezing and thawing cycles, the mixture proportions of this investigation displayed a maximum mass loss of 2.3 percent and a minimum durability factor of 91.2 percent.
10.14359/368
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