In today’s market, it is imperative to be knowledgeable and have an edge over the competition. ACI members have it…they are engaged, informed, and stay up to date by taking advantage of benefits that ACI membership provides them.
Read more about membership
Become an ACI Member
Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
ACI World Headquarters
38800 Country Club Dr.
Farmington Hills, MI
ACI Middle East Regional Office
Second Floor, Office #207
The Offices 2 Building, One Central
Dubai World Trade Center Complex
Phone: +971.4.516.3208 & 3209
ACI Resource CenterSouthern California
Feedback via Email
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 23 Abstracts search results
September 1, 2021
Camila Simonetti, Bernardo Fonseca Tutikian, and Luiz Carlos Pinto da Silva Filho
The possibility of incorporating scrap tire residue into concrete has already been consolidated in previous studies, but there is a knowledge gap about how concrete made with recycled tire materials behaves when exposed to high temperatures. This study aims to investigate the performance of precast concrete panels made with scrap tire residues when exposed to fire when using recycled steel fiber and recycled rubber aggregates separately. The experimental design consisted of fire resistance tests. Real-scale panels were exposed to the standard fire curve based on ISO 834, measuring the temperatures on the panel surfaces. The recycled steel fiber-reinforced concrete and those containing 5% recycled rubber aggregate presented similar behavior when compared to the
conventional concrete on thermal insulation, integrity, and structural stability. The concrete made with 10% recycled rubber aggregate registered the occurrence of explosive spalling and worse
thermal insulation and integrity.
March 1, 2020
Steel fiber-reinforced concrete (SFRC) can be an ideal substitute for conventional steel reinforcement in railway tunnel lining construction due to its high strength and good fire resistance. On the other hand, it is still not clear whether discontinuous steel fibers can pick up and transfer stray current and lead to similar corrosive attack as that occurs in conventional steel reinforcement. These were
evaluated through voltammetry tests and electrochemical impedance spectroscopy (EIS) before and after simulated railway stray direct current (DC) and alternating current (AC) interferences. In addition to instrumental methods in electrochemistry, numerical modeling based on the boundary element method (BEM) modeling indicates that discrete steel fibers can pick up and transfer stray currents. This was validated by the electrochemical investigations conducted using both aqueous and solid (mortar) electrolytes. It can be concluded that steel fibers have high corrosion resistance to stray AC and DC interferences even with the presence of a small amount of NaCl in the electrolyte.
November 1, 2017
Zhiming Ma, Zuquan Jin, Tiejun Zhao, and Yuanchao Cao
Sacrificial concrete is a cement-based material used for fire protection purposes. It is commonly used as a protective layer in nuclear reactor core containment structures in nuclear power plants. Its purpose is to act as a protection material only. Sacrificial concrete is particularly effective in protecting nuclear reactor core containment because it possesses high temperature stability and high melt capability that can reduce or help avoid the deterioration due to ultra-high temperature exposure from nuclear reactor core accidents or meltdowns. Sacrificial concrete is used in European pressurized reactors (EPRs), as an example, to contain molten core melts by melting a sacrificial concrete layer within the containment, which helps to cool the molten core and assists in avoiding a hot melt on the load-bearing containment structure. The study of performance of sacrificial concrete in ultra-high temperature exposures is in its early stages. To investigate the behavior and properties of sacrificial concrete at the ultra-high temperature of 5430°F (3000°C), numerical modeling simulating the same environment of a nuclear accident is established. Results indicate that the water-cementitious materials ratio (w/cm) and mineral admixtures have a significant impact on compressive strength, water loss, and water content of sacrificial concrete. Mixture proportions presented in this paper possess outstanding spalling resistance and melting behavior. Even at ultra-high temperatures, the sacrificial concrete possesses good melting behavior, and the melt depth of sacrificial concrete increases proportionally with time, which can effectively reduce the detriment of a nuclear accident.
September 1, 2017
A. Gil, F. Pacheco, R. Christ, F. Bolina, K. H. Khayat, and B. Tutikian
There is still a concern regarding concrete structures’ fire safety, mostly due to the occurrence of concrete spalling. Although many tests have already been carried out, there is no clear definition about the parameters of the factors that influence its occurrence. This paper aimed to compare three different types of concrete panels, with dimensions of 300 x 315 x 10 cm (124.0 x 39.4 x 3.9 in.), composed of reinforced concrete (RC), prestressed concrete, and polypropylene microfiber RC. The panels were exposed to the standard fire curve based on ISO 834, aged 28 days, measuring the temperatures in panels’ surfaces. Prestressed concrete panels experienced explosive spalling 18 minutes after the test began. RC panels and the panels with polypropylene microfiber addition maintained their integrity and structural stability for 240 minutes, failing in the thermal insulation criteria at 210 and 140 minutes, respectively. Although polypropylene microfiber concrete panels presented no spalling of concrete, conventional concrete panels attended the standardized criteria for a longer period due to its better thermal insulation.
January 1, 2017
Martin Neuenschwander, Markus Knobloch, and Mario Fontana
This paper presents a generic uniaxial constitutive model of the complete stress-strain curve of concrete in compression, adaptable to elevated temperatures solely by temperature-dependent material parameters. The pre-peak regime is divided into an initial linear part until the point of first yielding and a subsequent nonlinear part, starting with a tangent slope equal to the elastic modulus. The post-peak regime is split into two parts by the inflection point of the descending branch and ends at a predefined degree of softening. Additionally, elastic stiffness degradation is considered in the post-peak regime. First, analytical expressions for the different parts are derived and then the model is validated against experimental data of normal-strength concrete and self-consolidating concrete at elevated temperatures, including data from specimens heated under sustained loading. Finally, the model performance is discussed with respect to existing models in the literature and to the available design code models.
Results Per Page
Please enter this 5 digit unlock code on the web page.