Construction Engineering and Management Commons^™

Characterizing Equipment Cost, Fuel Use, And Emissions For Earthwork Activities, Phil Lewis, Yongwei Shan, Apif Hajji, Elizabeth Hazzard

The Professional Constructor

The objective of this paper is to examine the relationships between construction equipment costs, fuel use, and air pollutant emissions to make more informed decisions in construction planning and achieve more sustainable construction activity. This paper presents an estimating approach that combines both construction and environmental data to assess the relationships between equipment costs, fuel use, and emissions. To characterize these relationships, a case study is presented for a dozer performing a bulk excavation activity. Sensitivity analyses based on soil type, dozing distance, and engine horsepower rating are presented. Results indicate that there is little difference in the equipment total …

General Interest Articles, American Institute Of Constructors

The Professional Constructor

No abstract provided.

Assessing The Economic, Energy, And Environmental Impacts Of A Bridge Replacement Project, Elizabeth Hazzard, Phil Lewis

The Professional Constructor

As the nation moves toward more sustainable energy and environmental standards, it is important to examine all sources of fuel consumption and pollution, including heavy-duty diesel (HDD) construction equipment. In order to quantify these sources at the project level, they must be identified with their respective activities. A case study was performed on an Oklahoma Department of Transportation (ODOT) bridge replacement project in order to establish a baseline estimate of real-world equipment activity, fuel use, and emissions data. These data were collected on a daily basis via jobsite visits and included specific information such as the equipment’s model year, engine …

In Memory Of Fran Dugan, American Institute Of Constructors

The Professional Constructor

No abstract provided.

Analysis Of Green Building Initiatives On U.S. University Campuse, Dennis C. Bausman, Ben Mueller

The Professional Constructor

As population expands and resource consumption grows, interest in sustainable practices continues to intensify. Universities and colleges in the U.S. have been leading the trend toward building certification and green initiatives to reduce energy consumption, lower water consumption, and recycle solid waste. This study investigates the extent to which green practices are implemented on new construction and the renovation of existing building stock on university campuses across the United States. The study also examines the financial analysis techniques institutions use to assess and prioritize green initiatives on new and existing facilities. The population selected for this study was two hundred …

Full Issue, Volume 39, Number 1

The Professional Constructor

No abstract provided.

Risk Management In Motorway Ppp Projects: Empirical-Based Guidelines, Nunzia Carbonara, Nicola Costantino, Louis Gunnigan, Roberta Pellegrino

Articles

This paper deals with the topic of risk management in Public–Private Partnership (PPP). The analysis of the related literature reveals that risks must be analyzed and managed on a context-specific approach, and that there is a lack of a comprehensive study on the appropriate risk mitigation strategies for each risk embedded in PPP projects. Focusing on the transport sector, based on the results of a Delphi survey, the paper provides guidelines for both public and private parties in defining a list of significant risks in PPP motorway projects, and identifying for them both the effective allocation and the suitable mitigation …

Structural Properties Of Concrete Materials Containing Roadcem, Niall Holmes

Articles

This paper presents findings from a preliminary study to assess the structural and material properties of a nonstandard, concrete type mix containing RoadCem, a traditional soil stabilising additive. Two different mixes determined the effect of adding RoadCem in terms of compressive and flexural strengths, breaking strain, thermal expansion and contraction behaviour, permeability using a falling head, and Young’s modulus. RoadCem is a fine powder containing alkali metals and synthetic zeolites which are complemented with a complex activator. RoadCem modifies the dynamics and chemistry of cement hydration by enhancing the crystallisation process and forming longer needle crystalline structures. It reduces the …

Bs News January/February

Building Services Engineering

No abstract provided.

The Applicability Of Western Management In The Middle East, Zamaan Al-Shabbani

Theses and Dissertations--Civil Engineering

The Middle Eastern construction industry is still suffering from cost overruns, delays, and disputes. Inefficient management practices and lack of management are frequently reported reasons for such problems. Researchers attribute such problems to the traditional management practices that are utilized in the Middle East. However, International companies who practice their best management strategies are still suffering from the same problems. These issues become more significant in joint ventures when two different management styles work together. Therefore, it becomes crucial to understand the characteristics of Middle Eastern construction environment in terms of the management practices and regulations that are used and …

Effects Of Posttensioning Slippage On 2-Way Spanning Concrete Slabs, Niall Holmes, Eoin Byrne

Articles

This paper investigates the effect of improper posttensioning of a 2-way spanning concrete slab subject to a central point load. Due to plate slippage alone, the support conditions only offered a 1-way spanning action which could have led to premature failure with dangerous consequences. Posttensioning can strengthen a flat slab against punching shear by controlling deflections and cracking under service loads compared with traditional punching shear reinforcing methods leading to more slender structures and economic solutions for longer spans. However, if the method is not properly applied, these thinner floor plates can fail in a brittle and sudden manner by …

The Design Of A Modelling, Monitoring And Validation Method For A Solid Wall Structure, Timothy O'Leary, Gillian Menzies, Aidan Duffy

Conference Papers

Hygrothermal assessment is the combined analysis of heat, air and moisture transfer through the building fabric. The two approaches are covered by conventions known as the IS EN 5250:2011 (Glaser method) and IS EN 15026:2007 which differs from Glaser by solving the equations numerically using computer software. Results for hygrothermal analysis provide valuable information for surface and interstitial condensation risk assessment and the impact of energy upgrades. For traditional solid walled structures, conditions such as wind driven rain (WDR) and rising ground water can have a significant impact on the environmental behaviour and in particular the moisture behaviour of the …

First Steps In Developing Cement-Based Batteries To Power Cathodic Protection Of Embedded Steel In Concrete, Niall Holmes, Aimee Byrne, Brian Norton

Articles

This paper presents the first steps in developing innovative cement-based batteries to power cathodic protection in reinforced concrete structures. Initial electrical outputs of 1.55V and 23mA have been found to be sufficient to polarise prescribed corrosion currents of 20mA per m2 of embedded steel. Cathodic protection is a well-developed and powerful technique to limit the effects of steel reinforcement corrosion. However, as it requires an electrical supply day and night, it is often powered by non-environmentally friendly diesel generators or connected to the electrical grid. This paper focuses on increasing the ionic conductivity of the solution in the cement pores, …

Using Simulated Virtual Interactivity In Construction Education, Saeed Rokooei, James D. Goedert

Department of Construction Engineering and Management: Faculty Publications

This paper briefly illustrates the design procedure, implementation and findings of a three year research project. Virtual Interactive Construction Education (VICE) is a project-based pedagogical model that uses a simulated environment to alter traditional subject-based lectures into virtual project-based interactive learning methods in construction education. For this purpose, the context of construction engineering and management curricula were aggregated into six construction project prototypes. VICE-Bridge is the first of these six prototypes that exposes players to experiential problem solving activities toward achieving a goal situation (construct the bridge) from an initial situation (start of construction). It was designed for students with …

A Study Of Uplift Capacity Of Pipeline In Soils, Khamnoy Kounlavong

Chulalongkorn University Theses and Dissertations (Chula ETD)

This thesis aims to analyze the uplift capacity of a burial pipeline in two types of soil namely cohesionless soils and cohesive-frictional soils. Finite element analysis with two dimensional plain strain condition were employed to model and determine the limit load of this problem. Cohesionless and cohesive-frictional soils were model as Mohr-coulomb materials in the drained condition while a pipeline was modeled as plate element with an elastic material with high axial and bending stiffness to ensure its rigid behavior. Parametric studies of cohesionless soils and cohesive-frictional soils were performed to study effects of dimensionless variables, including 1) embedment depth …

Numerical And Experimental Studies Of Undercut Slopesinclined Along A Bedding Plane, Rithy Ouch

Chulalongkorn University Theses and Dissertations (Chula ETD)

Slope failures along a bedding plane were critical issues and mostly happened in an open pit mining project such as the Mae Moh Mine, Thailand. The prediction of maximum width to which the slope remains stable after an excavation process is required. The aim of this research is to investigate the stability and failure mechanisms of undercut slopes with and without shear pins resting on a bedding plane by means of physical and numerical models. Physical models of slip tests and undercut slopes were made of the humid silica sand No. 6 with 10% of water content and rested on …

Deformation-Based Excavation Support System Design Method, Sekyi K. Intsiful

Theses and Dissertations--Civil Engineering

Development in urban areas around the world has steadily increased in recent years. This rapid development has not been matched by the ever decreasing open space commonly associated with urban centers. Vertical construction, thus, lends itself a very useful solution to this problem. Deep excavation is often required for urban construction. Unfortunately, the ground movements associated with deep excavation can result in damage to adjacent buildings. Thus, it is critically important to accurately predict the damage potential of nearby deep excavations and designing adequate support systems.

A new design method is proposed, as an attempt, to address the problem. The …

Interfacial Bond Between Reinforcing Fibers And Calcium Sulfoaluminate Cements: Fiber Pullout Characteristics, Robert B. Jewell, Kamyar C. Mahboub, Thomas L. Robl, Arne C. Bathke

Civil Engineering Faculty Publications

The results of an experimental investigation on the influence of the interfacial bond of reinforcing fibers embedded in a calcium sulfoaluminate matrix on the fiber-pullout peak load and energy consumption are presented. Bonding at the fiber-matrix interface plays an important role in controlling the mechanical performance of cementitious composites—in particular, composites formed from sulfate-based systems (calcium sulfoaluminate [CSA] cements), as opposed to the silicate systems found in portland cement. Various types of fibers were selected, including polyvinyl alcohol (PVA), polypropylene, and copper-coated steel. The fibers were embedded in three different matrixes: two sulfate-based cements including one commercially available CSA cement …

The Role Of Shrinkage Strains Causing Early-Age Cracking In Cast-In-Place Concrete Bridge Decks, Tayyebeh Mohammadi, Baolin Wan, Christopher M. Foley

Civil and Environmental Engineering Faculty Research and Publications

Early-age cracking in cast-in-place reinforced concrete bridge decks is occurring more frequently now than three decades ago and principle factors that lead to early-age deck cracking are not fully understood. A finite element (FE) simulation methodology for assessing the role of shrinkage-induced strains in generating early-age bridge deck cracking is described. The simulations conducted indicate that drying shrinkage appears to be capable of causing transverse (and possibly longitudinal) bridge deck cracks as early as 9 to II days after bridge deck placement. The drying-shrinkage induced stresses would result in transverse cracking over interior pier supports in a typical bridge superstructure …

Construction Claims: Impact Of Defective Construction On Long-Term Facility Maintenance Costs, Khalid Siddiqi, Alejuandro Hunt

Faculty Articles

The industry is becoming one of the leaders in producing and implementing sustainable building metrics by promoting the use of renewables, Green Building, Lean Building and LEED Construction. The newly introduced changes present challenges to sustainable construction and has led to more companies and stakeholders promoting integration of all construction phases. This study was conducted to quantify the impact on defective construction procedures and methods on sustainable construction projects' recurring facility maintenance costs. The research data was collected from public school facilities constructed under a sustainable construction program. These projects have been completed in the past 10 years and with …