Engineering Commons^™

Research On Concrete Durability Improving For Existing Island-Building And Its Application, Mao Jianghong, Zhu Yaofeng, Xu Fangyuan, Jin Weiliang, Xu Yidong, Chen Xu

International Conference on Durability of Concrete Structures

China’s coastal cities contain a large number of islands with abundant human activities, in which buildings are in a typical marine corrosion environment and the corrosion of reinforced concrete structures is very prominent. This paper makes research work on two aspects: (1) the durability assessment and durability improvement after a thorough investigation of the architecture of Xiangtan County, Ningbo city, on an island and (2) the application research of the bidirectional electromigration rehabilitation (BIEM) technology to enhance the durability of existing island building life. This paper designs a set of BIEM equipment based on solar power supply and develops a …

Chloride Penetration In Surface-Treated Concrete In Natural And Accelerated Environments, Jianfeng Dong, Yuxi Zhao, Shaoliang Pu, Ming Ji

International Conference on Durability of Concrete Structures

This study investigated the chloride penetration of surface-treated concrete in natural and accelerated environments. A part of a real concrete port, including the beams and the columns, was investigated. Concrete specimens cast together with the concrete port were transported to the lab and subjected to wetting and drying cycles for accelerating the ingression of chloride ion. Chloride concentration of the specimens in the lab and the components in situ was tested. The results show that the surface treatments obviously slow down the chloride penetration into the concrete in both lab and in situ. The chloride penetration in situ is …

Hierarchical Life-Cycle Design Of Concrete Structures, Zhujun Wang, Jin Weiliang, Ju Chen

International Conference on Durability of Concrete Structures

Concrete structures’ service life lasts decades. In order to deal with all the probable degradations and deteriorations in the whole life span, the concept of concrete structures’ Life-Cycle Design was introduced into China in the 1980s. However, until this day, Life-Cycle Design is still more of a concept to most structure designers and engineers, rather than a practical method. This paper provides a hierarchical method for concrete structures’ Life-Cycle Design, in which the design process is divided into five levels. Safety should be the fundamental requirements for all concrete structures, so as to guarantee a reliable quality. For structures located …

Study Of Water Permeability Of Lightweight Concrete, Xiaoxiao Xu, Haibin Yang, Hongzhi Cui, Zitao Lin, Tommy Yiu Lo

International Conference on Durability of Concrete Structures

The relationship between water permeability and different levels of the tested layers from the top surface to the bottom surface of the lightweight concrete specimens is determined in this study. It is beneficial to develop the design criteria for a durable lightweight concrete. The water permeability coefficient K of the samples was determined by water permeability test using GWT. It is found that the water permeability coefficient K of the three layers in each set of samples tends to decrease as the level of the tested from the top surface increase. Larger Rebound Number and higher density in the bottom …

Influence Of Sio2@Pmhs On The Water Absorption Of Cement Mortar As A Surface Treatment Agent, Ran Li, Pengkun Hou, Zonghui Zhou, Xin Cheng

International Conference on Durability of Concrete Structures

In this paper, the core–shell structured SiO₂@PMHS hybrid nanoparticles were synthesized with tetraethoxysilane (TEOS) and polymethylhydrosiloxane (PMHS). And SiO₂@PMHS core–shell nanoparticles were first used as a surface treatment agent for cement-based materials. The influence of SiO₂@PMHS nanoparticles on the water absorption of hardened cement mortar with water-to-cement ratio of 0.6 was investigated. Results showed that the water absorption of cement mortar treated with SiO₂@PMHS nanoparticles was decreased by 93.47% in comparison to the control sample.

Edge Detection Of Concrete Mesostructure Based On Dis Operator, Bin Feng, Zicheng Xu, Jin Xia, Shijie Jin, Weiliang Jin

International Conference on Durability of Concrete Structures

Aggregate edge detection is the basis of creating concrete mesoscale model, which is applied to analyze concrete mesoscale characteristics. A concrete digital image edge detection method using DIS operator is presented in this paper. Mean filter, multi-scale filter, and Gaussian filter are compared on the effect of concrete image noise reduction. Based on the result, Gaussian filter is the most optimum method to reduce image noise and remain aggregate edge distinct. Sobel operator, Laplacian operator, and DIS operator are applied respectively to detect the aggregate edge on Gaussian filter processed images. Based on the experiment, DIS operator outperforms other two …

Influence Of The Surface Treatment Of Hardened Cement Mortar With Colloidal Nano-Silica And Teos, Pengkun Hou, Xin Cheng, Zonghui Zhou

International Conference on Durability of Concrete Structures

Two types of silicate material, tetraethoxysilane (TEOS) and colloidal nanoSiO2 (CNS), were applied for surface treatment of hardened cement mortar by exploring their filling and pozzolanic reactivity to make the surface compacter. Results showed that the water adsorption coefficient, the water vapor transmission rate, and the water penetration depth were reduced when CNS and TEOS were applied onto the surface of hardened cement mortar, and TEOS exhibits a superior effect on surface treatment, making the mass-transport rate and extent smaller than CNS does.

Performance Of Concrete Patch Repairs: From A Durability Point Of View, Choorackal Avirachan Eldho, Ominda Nanayakkar, Jun Xia, Steve Jones

International Conference on Durability of Concrete Structures

Chloride contamination in reinforced concrete leads to the corrosion of steel bars. Concrete patch repairs are widely practiced as a remedial measure for the mitigation of such corrosion in reinforced concrete structures. The performance of the patch repairs was studied by various researchers in the past. The structural and material aspects of patch repairs have received more attention than the electrochemical consequences of patch repairs in past studies. But electrochemical changes could be the underlying cause for the failure of many patch repairs. This paper reviews the performance of patch repairs from a durability point of view. It covers the …

Aggregate Shape Effect On Multicomponent Ionic Electromigration In Concrete, Qing-Feng Liu, Long-Yuan Li, Jian Yang

International Conference on Durability of Concrete Structures

This paper presents a numerical study on the mechanism of chloride migration in concrete. Unlike most of existing work, this study utilises multicomponent ionic transport models to reflect the influence of ionic interactions by coupling both mass conservation and Poisson’s equations. A series of 2-D, 3-phase models with different shapes and volume fractions of aggregates are developed to simulate the chloride migration test. Through a comparatively overall numerical exploration that considers external voltage, ionic interactions, heterogeneous nature, ITZ, and ionic binding, some important features about multispecies coupling and aggregate shape effect, which have not been properly reported from existing concrete …

Effectiveness Of Vacuum Saturation Preconditioning Regime For Assessing Water Permeability Of High Performance Concrete, Kai Yang, Muhammed Basheer, Changhui Yang, Yun Bai, Adrian Long

International Conference on Durability of Concrete Structures

Saturating high performance concrete (HPC) for assessing water permeability is a challenge. This paper reports a testing program established to determine the reliability and efficiency of an in situ preconditioning regime, the vacuum saturation, for the water permeability test. The vacuum saturation regime was examined through changing the parameters used and to justify if the field conditioning regime is able to yield similar results as in the laboratory, the results after vacuum saturation were statistically analysed and compared with that after incremental immersion. Its accuracy was further examined by additional experiments, whereas factors considered include different concrete mixes and different …

Research On Chloride Penetration Resistance Of Hybrid Fiber Reinforced Self-Compacting Concrete, Wu-Jian Long, Zhe-Ming Mai, Jin-Guang Shi, Tian-Tian Zhao, Wu-Lei Peng

International Conference on Durability of Concrete Structures

The properties of chloride penetration of hybrid fiber reinforced self-compacting concrete (SCC) were investigated in this study. The results show that, the chloride penetration resistance of concrete can be improved by single incorporation either carbon or cellulose fibers. The concrete chloride diffusion coefficient D_RCM of 12-cm length carbon SCC with fiber content of 1.7 kg/m³, 2.72 kg/m³, and 3.4 kg/m³ decreases by 10.3%, 25.5%, and 18.2% compared to reference concrete without any fibers, respectively. Moreover, the concrete chloride diffusion coefficient D_RCM of cellulose SCC with fiber content of 1.2 kg/m³, 1.6 …

Corrosion Of Steel In Concrete And Its Prevention In Aggressive Chloride-Bearing Environments, Luca Bertolini, Maddalena Carsana, Matteo Gastaldi, Federica Lollini, Elena Redaelli

International Conference on Durability of Concrete Structures

This keynote paper deals with the durability of reinforced concrete (RC) structures exposed to aggressive environments characterized by high concentration of chloride ions, namely, marine environments or the use of de-icing salts. The mechanism of chloride-induced corrosion of steel in concrete is introduced, and its influence on the service life of RC structures is analyzed. Factors affecting the time to corrosion initiation are described with regard to both concrete properties and environmental exposure conditions. Design approaches available for achieving durability targets associated with the design service life are analyzed, focusing on studies carried out by the authors in recent years …

Moisture And Temperature Effects On Interface Mechanical Properties For External Bonding, Tamon Ueda, Justin Shrestha, Khuram Rashid, Dawei Zhang

International Conference on Durability of Concrete Structures

In order to develop rational guidelines for strengthening by external bonding, it is necessary to clarify longterm performance of interfacial bonding property. In this paper, moisture effects on bonding properties at FRP–concrete interface and temperature/moisture effects on bonding properties at PCM–concrete interface are presented. Shear bond strength of FRP–concrete interface is affected by moisture because resin–concrete adhesion strength is affected by moisture. Among tested CFRP external bonding systems, wet-layup CFRP systems all show the strength reduction, while prefabricated CFRP systems all show the strength increase after immersion. The bond stress–slip relationship and interfacial fracture energy also change, which can explain …

Work In Progress: Rigorously Assessing The Anecdotal Evidence Of Increased Student Persistence In An Active, Blended, And Collaborative Mechanical Engineering Environment, Jennifer Deboer, Nick Stites, Edward J. Berger, Jeffrey F. Rhoads, Charles Morton Krousgrill, David B. Nelson, Craig Zywicki, David A. Evenhouse

Freeform Publications

This work in progress describes an ongoing study of an active, blended, and collaborative (ABC) course environment used in a core mechanical engineering course. This course has built on the growing body of literature citing active learning (Freeman et al., 2014), blended structures (Bowen & Ithaka, 2012), and collaborative engagement (Jeong & Chi, 2007) as positive influences on college and university science, technology, engineering, and math (STEM) outcomes. For the last six years, “Dynamics”, a core mechanical engineering course at a large public university, has utilized in-class activities, frequently-watched problem-solving videos, and a collaborative blog space to realize an ABC …

Systematic Review Of The Funds Of Knowledge Framework In Stem Education, Dina Verdin, Allison Godwin, Brenda Capobianco

School of Engineering Education Graduate Student Series

This theory paper examines literature on the construct, funds of knowledge, as it has been applied in STEM education, with an emphasis on engineering and explores if and how funds of knowledge has been used to understand first-generation college students in engineering. Using a systematic literature review, we describe how the framework of funds of knowledge has been adopted in the engineering education literature. Funds of knowledge is a conceptual framework that has been concerned with social justice issues around validity and impacts of deficit theorizing (a theory that points to the underachievement of minority groups on perceived deficiencies related …

More Comprehensive And Inclusive Approaches To Demographic Data Collection, Todd Fernandez, Allison Godwin, Jacqueline Doyle, Dina Verdin, Hank Boone, Adam Kirn, Lisa Benson, Geoff Potvin

School of Engineering Education Graduate Student Series

In this evidence-based practice paper, we discuss ways for researchers and educators to more sensitively, accurately, and effectively collect demographic information on surveys. Identifying variables that capture diversity more broadly is vital in understanding the variety of ways in which students participate in and experiencing engineering education. We frame this discussion through publically available statistics that suggest the potential error in common approaches employed for demographic collection. While basic questions about participants’ sex and ethnicity are standard items in assessment and data collection, these questions only develop a limited representation and potentially present an inaccurate accounting of students’ social identities …

Voicing The Indescribable - Using Photo Elicitation As A Method To Uncover Belonging And Community, Nicole P Pitterson, Juan D. Ortega-Alvarez, Ruth Streveler, Robin Adams

School of Engineering Education Graduate Student Series

Eleven years ago two NSF-funded programs aimed at fostering the development of a Community of Practice (CoP) among engineering education researchers, the Rigorous Research in Engineering Education (RREE) and the Institute for Scholarship on Engineering Education (ISEE), were initiated. The RREE and ISSE programs involved approximately 200 (147 RREE and 48 ISEE) faculty members in workshops and other professional development learning experiences that helped them become aware of and learn how to navigate the nuances of conducting engineering education research (EER) that met the standards of any scholarly field.

While big-data analytics can be applied to show evidence of a …

Transforming A Dynamics Course To An Active, Blended, And Collaborative Format: Focus On The Faculty, Jennifer Deboer, Maria J. Gerschutz, David A. Evenhouse, Nimit Patel, Edward J. Berger, Nick Stites, Craig Zywicki, David B. Nelson, Charles Morton Krousgrill, Jeffrey F. Rhoads

Freeform Publications

Mechanical engineering programs are increasingly applying educational research by transforming courses to be more interactive and to use a blend of online and face-to-face materials. However, the process of an existing course adopting these new practices is not well studied, and even less is understood about the faculty experience from on-boarding to delivery of a new curriculum or pedagogy. In this study, we follow the translation of an active, blended, and collaborative (ABC) curriculum for a core dynamics course from a large public university (where the ABC curriculum was developed) to a small private university. We use interpretive phenomenology to …

A Qualitative Study Investigating How First-Year Engineering Students' Value Beliefs Influence Their Choice Of Selecting An Engineering Major, Juan D. Ortega-Alvarez, S. Zahra Atiq, Hector E Rodriguez-Simmonds

School of Engineering Education Graduate Student Series

First year engineering (FYE) programs are gaining popularity across universities in the United States. In addition to providing general engineering knowledge and skills to undergraduate freshmen, FYE programs also provide students with diverse opportunities to help them select the engineering discipline they will further pursue. The 2014 cohort of the FYE program of a large Midwestern university was the sample used for a two-phased study. The aim of the study was to understand how students make informed decisions of which engineering major to pursue and to help FYE administration to improve the resources they provide students. The first phase of …

The Changing Role Of Professional Societies For Academics, Gretchen L. Hein, Daniela Faas, Anne M. Lucietto, Jacquelyn Kay Nagel, Diane L. Peters, Rebecca M. Reck, Mary C. Vestraete, Deborah J. O'Bannon

School of Engineering Technology Faculty Publications

This research paper describes how professional societies provide services to their members with a focus on the Society of Women Engineers (SWE). Professional societies fulfill many roles for their members. For underrepresented groups, the different roles become more important. Despite increasing numbers of women and other underrepresented groups in engineering academia, retention rates of women are still below the national average. Professional societies such as the Society of Women Engineers (SWE) may close the retention gap through community building. Not only do professional societies provide opportunities for networking and career building, but they also provide affirmation that there are others …

A Survey Of Types Of Industry-Academia Collaboration, Diane L. Peters, Anne M. Lucietto

School of Engineering Technology Faculty Publications

Collaborations between industry and academia are, when properly designed and managed, beneficial to both the industry partners and the academic institutions. Such collaborations may take place on both small and large scales, and may involve varying numbers of academic institutions and industry partners. They may also have different purposes, including both research-focused collaborative efforts and programs designed to connect undergraduate students with real-world projects to enhance their education. In this paper, the authors will provide a survey of different models of industry-academia collaboration in engineering and engineering technology. The paper will include both a survey of existing literature on the …

Identifying As An Engineering Technology Graduate, Anne M. Lucietto

School of Engineering Technology Faculty Publications

Engineering graduates identify themselves as a person formally educated in engineering, who belongs to a group of people practicing engineering. How does the person holding an engineering technology degree career identify? The lack of differentiating research between engineering and engineering technology graduates results in less knowledge about self-identification by the engineering technology graduate. Many believe that the positions held by engineering technology graduates further define their self-identity, as they are titled either engineers or technologists. Identity research focuses on career trajectory in the graduate student population. This focus places research in academia. Methods used to analyze early influences and their …

Purdue Mission To Mars: Recruiting High School Students To A Polytechnic College, Matthew Turner, Rustin Webster, Danielle Reynolds, Timothy Cooley, Andrew Mccart, Joseph F. Dues Jr.

School of Engineering Technology Faculty Publications

This paper presents the development and implementation of an integrative half-day recruiting event targeting high school students that combines elements of four degree programs: Organizational Leadership, Electrical Engineering Technology, Mechanical Engineering Technology, and Computer Graphics Technology. During the workshop, students engage in active learning: NAME REDACTED is transformed into an aerospace design think tank and high school students are transformed into Polytechnic interns. The interns are then presented with a challenge: A new form of bacteria has possibly been identified on Mars and soil samples must be collected for analysis. However, the next shuttle launch is in 3 hours and …

Systematic Review Of Engineering Technology Education Literature, Anne M. Lucietto, Eddy Efendy

School of Engineering Technology Faculty Publications

Few engineering technology education research publications exist; those that do are often viewed through the lens of the engineering education researcher. More specifically, engineering technology education is examined in the same manner as engineering education. The lack of rigorous research focusing on the education of engineering technology students may be the result of diverse engineering technology programs, and smaller research populations as compared to engineering and other STEM fields. Educators in engineering technology programs are challenged by this lack of discipline-specific rigorous research. The lack of engineering technology education research may be attributed to smaller numbers of engineering technology students …

Statistical Models Of Runway Incursions Based On Runway Intersections And Taxiways, Mary E. Johnson, Xun Zhao, Brian Faulkner, John P. Young

Journal of Aviation Technology and Engineering

According to the Federal Aviation Administration (FAA), the number of runway incursions are rising. The configuration of runways and taxiways at airports has been identified by the FAA as possibly being related to the number of incursions. In this paper, the relationship between airport geometry factors and the number of runway incursions at specific United States airports is explored using statistical analyses. Airport operations data from the FAA Air Traffic Activity System, runway incursion data from the FAA Aviation Safety Information Analysis and Sharing System from 2009 through 2013, and airport geometry data created using airport geometry features from the …

Promoting Effective Teaching In Science Learning Through Engineering Design [Sled], Brenda Capobianco, James Lehman, Chell Nyquist, Todd Kelley, Nancy Tyrie

Purdue P-12 Networking Summit & Poster Session

No abstract provided.

Purdue Polytechnic Institute And Project Lead The Way (Pltw), Kevin Kaluf

Purdue P-12 Networking Summit & Poster Session

No abstract provided.

Energy3d: Guiding Engineering Design With Science Simulations, Chandan Dasgupta, Alejandra J. Magana, Lisa Kirkham

Purdue P-12 Networking Summit & Poster Session

The Purdue P-12 Networking Summit gives Purdue faculty and staff engaged with P-12 schools a forum to interact with each other, share ideas, and develop collaborations that make programs more effective. Faculty and staff are invited to attend.

Dawn Or Doom: The Risks And Rewards Of Emerging Technologies, Diana Hancock, Steve Tally, Gerry Mccartney, Michele Arthur

Purdue P-12 Networking Summit & Poster Session

Dawn or Doom is a free and open to the public conference at Purdue where we focus on benefits and risks surrounding some of the technologies that are both the most disruptive to current practices and being adopted the fastest. A collection of Purdue faculty experts and some outside speakers showcase their many perspectives related to this technology explosion, explore conditions that will foster innovation and investment into the next generation, and address the big-picture issues where both optimism and pessimism are warranted.

Women In Engineering P-12 Outreach, Sue R. Bayley Mrs.

Purdue P-12 Networking Summit & Poster Session

No abstract provided.