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Full-Text Articles in Engineering

Nano-Engineered Heated Pavements, Ali Arabzadeh Aug 2019

Nano-Engineered Heated Pavements, Ali Arabzadeh

Ali Arabzadeh

Millions of dollars are spent annually for removing ice and snow from paved surfaces using conventional techniques such as deployment of snow plowing equipment and use of deicing chemicals that are neither economical nor environmentally friendly. Alternative approaches such as producing superhydrophobic (super water-repellent) pavement surfaces and implementing electrically-conductive heated pavement systems, or even merging these two technologies to produce hybrid heated pavement systems, can alleviate many of the problems associated with conventional ice and snow removal techniques.

In this study, superhydrophobic concretes – including hot mix asphalt (HMA) and portland cement concrete (PCC) – and electrically-conductive asphalt matrices, including electrically conductive ...


Long-Term Performance Of Sustainable Pavements Using Ternary Blended Concrete With Recycled Aggregates, Seth M. Wagner Aug 2019

Long-Term Performance Of Sustainable Pavements Using Ternary Blended Concrete With Recycled Aggregates, Seth M. Wagner

Theses and Dissertations

The purposes of this study were to (a) design concrete pavement mixtures with recycled concrete aggregates using ternary blends of cementitious materials and a low water-to-binder ratio, (b) measure the fresh and hardened properties of the proposed concrete mixtures and (c) assess the long-term performance of the concrete implementing the use of recycled coarse aggregates. Preliminary investigation into ternary blend combinations via the compressive testing of mortar cubes and isothermal calorimetry was used to predict an optimal blend of cementitious material. Mixes using recycled concrete aggregates at varying replacement rates were tested for fresh and hardened properties using the proposed ...


Folding In Research, Roger Hubeli Jun 2019

Folding In Research, Roger Hubeli

Building Technology Educator's Society

The paper describes how the research collaboration between design faculty and the research arm of one of the world’s largest concrete and cement manufacturers can serve as a basis for advanced building technology courses and provide internship opportunities for the students to further deepen the knowledge they gained in the class. The larger context of the course is the recent advancement in concrete mix technology and the resulting opportunities to develop novel fabrication and construction techniques.

The paper showcases a professional elective course (seminar) that was structured around an advanced concrete cast technology that allows concrete forms to be ...


Material Design Integration, Roger Hubeli Jun 2019

Material Design Integration, Roger Hubeli

Building Technology Educator's Society

The goal of an integrative building design studio is for students to develop and prove the capacity to integrate different technical and possibly legal and financial considerations into their architectural projects. In this context, it is most important for the students to learn how to maintain a clear conceptual strategy that can serve as a ‘pièce de résistance’ against the multitude of different pressures, providing a larger framework for design decisions. This presentation discusses a series of projects where this ‘pièce de résistance’ was based on the design potentials of advanced pre-cast concrete construction. Tectonic concerns, with a focus on ...


Mitigating Carbon Dioxide Emissions In The Cement Industry Through Carbon Capture And Storage, Nicholas J. Cramer Jun 2019

Mitigating Carbon Dioxide Emissions In The Cement Industry Through Carbon Capture And Storage, Nicholas J. Cramer

Construction Management

The cement industry is responsible for 7% of industrial energy use, the third largest energy consumer in the world. The industry is also responsible for 7% of global carbon dioxide emissions, the second largest industrial emitter. With current trends continuing, global cement usage will rise with population and urbanization. The low-carbon transition of the cement industry requires innovative technologies and producer cooperation. Carbon capture and storage, known as CCS, is a safe and sustainable solution to significantly reduce the amount being released into the atmosphere. Through CCS, carbon dioxide reacts with natural alkaline minerals, such as fly ash, to create ...


Interim Field Guide For Construction And Testing Of Concrete Shear Wall With Added Frp Layer, Carlos Alberto Espitia Jun 2019

Interim Field Guide For Construction And Testing Of Concrete Shear Wall With Added Frp Layer, Carlos Alberto Espitia

Construction Management

In Los Angeles, many of the hospitals are no longer up to code as they were built in the 1970’s. The shear walls that the hospitals were constructed on stand to experience major failures in the event of a seismic event and this is the issue that this student research team was assigned with. This project was to design, procure, and construct all necessary constraints to be able to test a wall that is fundamentally similar to that of the sheer walls in these hospitals. Once this was complete the goal was to test two walls with an added ...


Advanced Concrete Course For Cal Poly Construction Management Department, Dante N. Feliciano Jun 2019

Advanced Concrete Course For Cal Poly Construction Management Department, Dante N. Feliciano

Construction Management

This senior project provides a solution to the Construction Management Department at Cal Poly, San Luis Obispo whose curriculum lacks an individual Concrete course. With Concrete being one of the most used building material worldwide, this course will help immensely. The goal of this project is to fill the gap with an Advanced Concrete Course that is prepared and ready to be introduced to future students. The course has an emphasis on outside research learning – where the student gets to become the instructor. Carefully thought out and executed lecture materials are included in the course. Lecture slides give background information ...


Habitat For Humanity Global Village: Means & Methods Of Construction In Trinidad & Tobago, Garrett Landress Jun 2019

Habitat For Humanity Global Village: Means & Methods Of Construction In Trinidad & Tobago, Garrett Landress

Construction Management

Habitat for Humanity Global Village is a sector of Habitat for Humanity that focuses on aiding in the construction of homes for those in need around the world. Habitat for Humanity Trinidad and Tobago has been part of Habitat for Humanity Global Village for many years and aids people in need on the Island of Trinidad in the Southern Caribbean. This paper will discuss the construction of a small home for a woman whose family was disowned by her father due to her reluctance to uphold traditional Indian values. Subsequently the family was living in poverty and currently residing in ...


Comparison Of Carbon Fiber And Fiberglass On Concrete Strength, Justin A. Baker Jun 2019

Comparison Of Carbon Fiber And Fiberglass On Concrete Strength, Justin A. Baker

Construction Management

The purpose of this paper is to compare two common polymers of the construction industry and determine if there are benefits of using them in concrete application to increase overall strength. The goal of the project is to complete a full experiment, utilizing concrete cylinders and beams to test the compressive and tensile properties of fiberglass and carbon fiber. This paper provides data from the experimentation of the compressive and tensile tests of carbon fiber and fiberglass to prove that these polymers are superior and aid in overall concrete strength. The experiment proved that carbon fiber is superior to fiberglass ...


The Influence Of Citric Acid On Setting Time And Temperature Behavior Of Calcium Sulfoaluminate-Belite Cement, Edgar Soriano May 2019

The Influence Of Citric Acid On Setting Time And Temperature Behavior Of Calcium Sulfoaluminate-Belite Cement, Edgar Soriano

Civil Engineering Undergraduate Honors Theses

Today the need to opt for alternative cementitious materials is growing due to environmental reasons and construction time frames that portland cement cannot always satisfy. Calcium Sulfoaluminate (CSA) cements are a strong candidate to supplement or replace portland cement in the construction field for certain applications. In the United States, CSA cement has been limited mostly to pavement repairs because of its rapid initial setting time. The chemical compound responsible for this phenomenon is the alumina. This compound and sulfate are present in larger proportions compared to portland cement. The purpose of this research is to study how the use ...


Using Of Proper Pavement Material For The Intersections With Slow-Moving Traffic, Bekim Selimi Feb 2019

Using Of Proper Pavement Material For The Intersections With Slow-Moving Traffic, Bekim Selimi

International Journal of Business and Technology

Use of proper pavement material for some of intersections need special attention by road designers. At Camp Bondsteel-Kosovo on 2002 were built four road intersections using the concrete as pavement material. Heavy and slow-moving trucks that are turning or accelerating exposed these intersections to some of the highest stress level. After some years this intresections start deteriorating on their surface due to friction. The concrete pavements did not survive this period of usage and after eight years were removed and replaced with asphalt pavements. After more than seven years, the asphalt has shown minor distress but is still in good ...


Reducing The Porosity And Sealing Cracks By Using Crystalline Admixture In Conventional Concrete, Visar Krelani, Liberato Ferrara Feb 2019

Reducing The Porosity And Sealing Cracks By Using Crystalline Admixture In Conventional Concrete, Visar Krelani, Liberato Ferrara

International Journal of Business and Technology

There is a continuous increase of quality on civil engineering materials in developed countries and parallel increase of need for new constructions in developing countries. Professional community should propose solutions for the durability that can resist in different severe environments. The most important factor that can affect concrete durability is represented by the pore distribution. Transport properties can take place through the porous network inside the cementitious composites and the aggregates interface, permitting the ingress of aggressive agents damaging concrete function intrinsically as a material and the wellfunctioning of the entire structure. The use of a crystalline admixture during the ...


Prediction Of Punching Shear Capacity Of Two-Ways Frp Reinforced Concrete Slabs, Ilker Fatih Kara, Besian Sinani Feb 2019

Prediction Of Punching Shear Capacity Of Two-Ways Frp Reinforced Concrete Slabs, Ilker Fatih Kara, Besian Sinani

International Journal of Business and Technology

An innovative solution to the corrosion problem is the use of fiber-reinforced polymer (FRP) as an alternative reinforcing material in concrete structures. In addition to the non corrodible nature of FRP materials, they also have a high strength-to-weight ratio that makes them attractive as reinforcement for concrete structures. Extensive research programs have been carried out to investigate the flexural behavior of concrete members reinforced with FRP reinforcement. On the other hand, the shear behavior of concrete members, especially punching shear of two-way slabs, reinforced with FRP bars has not yet been fully explored. The existing provisions for punching of slabs ...


Mechanical And Durability Properties Of Concrete Under Low Temperatures, Yao Wang Jan 2019

Mechanical And Durability Properties Of Concrete Under Low Temperatures, Yao Wang

Civil Engineering Graduate Theses & Dissertations

Frost attack can heavily damage concrete materials and concrete structures. Therefore, it is important to predict the service life of concrete structures considering the effect of the deterioration process. A theoretical model based on Mori-Tanaka micromechanics method was developed to estimate the deterioration of elastic properties of concrete under low temperatures. The model took into account a continuous pore size distribution for cement paste, freezing temperatures with different pore sizes, and damage development in cement paste. The model was able to characterize the stiffening effect due to the formation of solid ice and the weakening effect of the damage development ...


Incorporation Of Contaminated Sediment Into Environmentally Safe Concrete, Andrew Needs Jan 2019

Incorporation Of Contaminated Sediment Into Environmentally Safe Concrete, Andrew Needs

Williams Honors College, Honors Research Projects

The research performed through this project provided some interesting results on how the different properties of the contaminated sediment can impact the strength of the new concrete.

Average three, seven, and fourteen-day strengths increased when comparing to the baseline mix developed for the experiment. Increases in strengths were notices in the ten and twenty-five percent soil replacement mixes. The largest increase was approximately thirty-three percent greater than the baseline average.

The results from the forty percent replacement test showed a significant decrease in strengths when comparing against the baseline mix. A loss of about thirty percent was observed between the ...


Analysis Of Standardized Concrete Mixes, Riley Graybeal Jan 2019

Analysis Of Standardized Concrete Mixes, Riley Graybeal

Williams Honors College, Honors Research Projects

Concrete is one of the most common materials used in construction. It is mass produced throughout the country, with numerous different designs for concrete mixes. A common practice among concrete manufacturers is to use a standardized concrete mix design. These standardized mix designs are pre-tested and are not usually altered frequently. The hypothesis of this research project is that manufacturers do not constantly investigate new ways to save on their mixes, and simply use the same standardized mix designs.

In this research, investigations into what alterations may reduce the cost of standardized mixes began with a baseline mix design provided ...


New Technique For Strengthening Squarereinforced Concrete Columns By The Circularisation With Reactive Powder Concrete And Wrapping With Fibre-Reinforced Polymer, Atheer Hilal Mahdi Al - Gburi, M Neaz Sheikh, Muhammad N. S Hadi Jan 2019

New Technique For Strengthening Squarereinforced Concrete Columns By The Circularisation With Reactive Powder Concrete And Wrapping With Fibre-Reinforced Polymer, Atheer Hilal Mahdi Al - Gburi, M Neaz Sheikh, Muhammad N. S Hadi

Faculty of Engineering and Information Sciences - Papers: Part B

This paper presents a new strengthening technique for square-reinforced concrete (RC) columns by circularisation with reactive powder concrete (RPC) and wrapping with fibre-reinforced polymer (FRP). RC column specimens were tested, divided into four groups of four specimens based on the strengthening technique: four reference square specimens (150mm side length) without any strengthening, four were wrapped with two layers of carbon fibre-reinforced polymer (CFRP) and the remaining eight were strengthened by changing the square cross-section to a 240mm diameter circle with RPC jacket. Four of the RPC jacketed specimens were left unwrapped, while the last four were wrapped with two layers ...


Concrete Grinding Residue: Its Effect On Roadside Vegetation And Soil Properties, Halil Ceylan, Yang Zhang, Bora Cetin, Sunghwan Kim, Bo Yang, Chenyi Luo, Robert Horton, Kasthurirangan Gopalakrishnan Jan 2019

Concrete Grinding Residue: Its Effect On Roadside Vegetation And Soil Properties, Halil Ceylan, Yang Zhang, Bora Cetin, Sunghwan Kim, Bo Yang, Chenyi Luo, Robert Horton, Kasthurirangan Gopalakrishnan

Reports and White Papers

Concrete grinding residue (CGR) is a slurry waste consisting of water and concrete fines generated from diamond grinding operations that is used to smooth a concrete pavement surface. During this process, CGRs are mostly disposed along the roadside, which can influence soils and plant communities along the roadways. To understand the effects of CGR on soil physical and chemical properties and plant growth, a controlled field site at the Kelly Farm in Iowa was used with CGR application rates of 0, 10, 20, and 40 dry ton/acre to test properties of soils and plants before the application and one ...


Performance Of Concrete Tunnel Systems Subject To Fault Displacement, Michael Morano Jan 2019

Performance Of Concrete Tunnel Systems Subject To Fault Displacement, Michael Morano

Masters Theses

A Finite Element Analysis (FEA) investigation of concrete tunnel systems traversing seismic faults is carried out to determine how to effectively mitigate the stresses induced in the liner when subject to fault displacement. A parametric study of various fault parameters, both in the damage zone and competent rock, is carried out to determine the site conditions which induce the most stress on the tunnel liner system. Results indicate that friction angle, cohesion, and elastic modulus of fault zones have varying effects on the stresses induced on the liner. The width of damage zone and expected displacements are also investigated and ...


Precast Concrete Bridge Barriers For Accelerated Bridge Construction, Ashley A. Ecklund Jan 2019

Precast Concrete Bridge Barriers For Accelerated Bridge Construction, Ashley A. Ecklund

Graduate Theses and Dissertations

Many transportation organizations have embraced Accelerated Bridge Construction (ABC) to reduce both the traffic impacts and societal costs. One of the most common means to achieve ABC is to utilize prefabricated elements, which are connected together on-site to construct a bridge. ABC will not be effective if the barrier requires cast-in-place construction. The purpose of this report is to present details of a precast barrier and two connection alternatives between the deck and precast barriers. In addition, a new connection between two adjacent prefabricated barriers is presented.

One barrier to deck connection uses inclined reinforcing bars with threaded ends that ...