Rafal Anay

Rafal Anay
University of South Carolina | USC · Department of Civil & Environmental Engineering

Doctor of Philosophy

About

25
Publications
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304
Citations

Publications

Publications (25)
Article
Acoustic emission (AE) monitoring during compressive loading was employed to investigate micro-crack formation and coalescence in cement paste specimens. To establish a correlation between damage and AE activity, the data was categorized on the basis of amplitude and cumulative signal strength (CSS). Three distinct stages of crack behavior, illumin...
Article
Several studies have been conducted to investigate early age Portland cement hydration using acoustic emission technique, with different mechanisms attributed by different authors. In the proof-of-concept research presented in this paper, acoustic emission (AE) was employed to explore relationships between recorded signals associated with elastic s...
Article
The need for rapid, cost-effective, and reliable techniques for assessment and load rating of in- service concrete bridge girders has grown rapidly in recent years. Every agency in the United States has numerous old and/or deteriorated concrete bridges, many of which are classified as structurally deficient. The current state of nondestructive load...
Conference Paper
Full-text available
Development of sustainable construction materials has been the focus of research efforts worldwide in recent years. Concrete is a major construction material; hence, finding alternatives to ordinary Portland cement is of extreme importance due to the high levels of carbon dioxide emissions associated with its manufacturing process. This study inves...
Article
Acoustic emission was used in this study to assess the condition of a simple-span, prestressed concrete bridge located in southern New Mexico during a proof test. The 40-year-old bridge is county owned and no design plans were available. Acoustic emission (AE) data were collected under several loading conditions from two groups of sensors placed ne...
Article
This study investigates the efficacy of differing information entropy calculation approaches for concrete structures undergoing alkali-silica reaction (ASR)-induced cracking. In prior work, information entropy has only been utilized for a better understanding of the damage in metallic structures under external loading. To our knowledge, no research...
Article
Full-text available
This study investigated the out-of-plane shear performance of a newly developed shape memory alloy (SMA) connector and a commonly used shear/alignment connector. The innovation lies in developing a durable and easily installed and maintained flange-to-flange connector between precast concrete double-tee members. The proposed connector consists of a...
Article
Full-text available
In this paper, acoustic emission (AE) and pattern recognition are utilized to identify the AE signal signatures caused by propagation of stress corrosion cracking (SCC) in a 304 stainless steel plate. The surface of the plate is under almost uniform tensile stress at a notch. A corrosive environment is provided by exposing the notch to a solution o...
Article
Previous research has not sufficiently addressed the availability of geopolymer concrete raw materials, which influences adoption for infrastructure constructions. The overview herein assesses the supply, demand, and cost of these raw materials, including fly ash, slag cement, metakaolin, sodium hydroxide, sodium silicate, and silica fume. The resu...
Conference Paper
Full-text available
Alkali-silica reaction (ASR) causes cracks in civil concrete structures such as nuclear power plants and may endanger their serviceability and integrity. The damage caused by ASR in the nuclear structures initiates mainly inside the structure and appears later on the surface. Acoustic emission (AE) is a passive method to monitor structural health....
Conference Paper
Full-text available
Dry cask storage system (DCSS) canisters used for the storage of high-level nuclear waste has begun to exceed the time for which they were originally intended. Therefore, efforts are being pursued by the nuclear industry to ensure that the structural integrity is maintained until arrangements have been made to transport the waste to a central repos...
Article
Full-text available
Data presented in this paper are utilized in the paper entitled “Acoustic Emission Bayesian Source Location: Onset Time Challenge” [1]. Hsu-Nielsen source which also known as pencil lead break (PLB), is an artificial method of generating acoustic emission (AE) signals, which can roughly represent an acoustic emission damage source. The data in this...
Conference Paper
Aircraft structures are subject to corrosion, fatigue and accidental damage during their different life cycle phases. For composite structure, resistance and tolerance to accidental damage related to impact, is often the main design driver. Impact events are classified with respect to location and representative impactor and impact energy. During c...
Article
Full-text available
Alkali-silica reaction has caused damage to concrete structures, endangering structural serviceability and integrity. This is of concern in sensitive structures such as nuclear power plants. In this study, acoustic emission (AE) was employed as a structural health monitoring strategy in large-scale, reinforced concrete specimens affected by alkali-...
Article
In an effort to reduce waste and engage in more sustainable construction, this research focuses on the development of a cost-competitive, environmentally-friendly geopolymer concrete mixture that offers structural benefits relative to ordinary Portland cement (OPC), uses fly ash, a toxic waste byproduct as a raw material, and reduces the amount of...
Conference Paper
Cement-based composites have been used as reliable materials in building and civil engineering infrastructure for many decades. Although there are several advantages, some drawbacks such as premature cracking may be problematic for sensitive applications such as those found in nuclear power plants or associated waste storage facilities. In this stu...
Article
This study investigates the geopolymerization process of fly ash-based geopolymer paste specimens using acoustic emissions; the activating solution is a combination of silica fume and sodium hydroxide, made with two different water:solid weight ratios (w/s), 0.30 and 0.35. The specimens are cured in ambient conditions (22 AE 3°C). The acoustic emis...
Conference Paper
Full-text available
There is a global focus on reducing greenhouse gas emissions and identifying solutions to reduce the negative impact of business on the environment. While there is no single solution, developing an alternative to Portland cement, which is responsible for 10% of CO2 emissions worldwide, represents a great opportunity for researchers and practitioner...
Article
Full-text available
In this research high strength structural lightweight mortar with compressive strength in the range of 33.5-52.5 MPa and unit weight in the range of 1625-2105 kg/m 3 is produced using perlite as fine aggregate. The current investigation deals with using perlite fine aggregate as replacement of silica sand with different rates. These rates are taken...
Article
Full-text available
In this paper, manual design of beam-columns, based on the procedure adopted by american Society of Steel Construction, is described. an attempt has been taken to apply artificial neural network to the design of steel beam-columns of hot-rolled shapes. for this purpose, a set of data have been generated using the software package staad pro, and the...

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Projects (3)
Project
Structural health monitoring of different structural applications using acoustic emission such as: 1. Acoustic Imaging for Cement Based Waste Forms. 2. Structural Health Monitoring of Composite Structure for Airplanes and Helicopters based on Passive Sensing of Acoustic Emission. 3. Nondestructive Evaluation of two Bridge Decks which were removed from a maintenance bridge built in 1953 in SC. 4. ASR damage evaluation using acoustic emission, with UT Knoxville.