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ABSTRACT: Abstract of Thesis Presented to the Graduate School of the University of Florida in Partial Fulfillment of the Requirements for the Degree of Master of Engineering CONCRETE CONTAINING RECYCLED CONCRETE AGGREGATE FOR USE IN CONCRETE PAVEMENT By Patrick Amoah Bekoe August 2009 Chair: Mang Tia Major: Civil Engineering Our study evaluated the feasibility of using concrete containing recycled concrete aggregate (RCA) in concrete pavement application. Concrete containing 0%, 25% and 50% of RCA were produced in the laboratory and their properties vital to the performance of concrete pavement evaluated. Result from the laboratory testing program indicates that the compressive strength and elastic modulus is reduced slightly as the percentage of RCA increases. The flexural strength, splitting tensile strength and coefficient of thermal expansion is about the same for concrete containing virgin aggregate and RCA. The free shrinkage increases slightly as the percentage of RCA increases. From the measured properties, a finite element analysis was performed to determine how the concretes containing the different amounts of RCA would perform if they were used in a typical concrete pavement in Florida. The analysis from the finite element model determined the maximum stresses under critical temperature and load conditions. The potential performance of the different pavements was evaluated based on the computed maximum stress to the flexural strength ratio. The maximum stress to flexural strength ratio in the pavement was found to be about the same as the percentage of RCA increases. This indicates that RCA can be used successfully in concrete pavement without affecting the performance.
This interim report documents the field performance of nine concrete pavement projects that incorporate recycled concrete aggregate (RCA) in the construction of the pavement. Multiple sections were evaluated on many of the nine projects, due to perceived differences in performance levels or variations in pavement design (such as the use of virgin aggregate or the inclusion of dowel bars). All told, a total of 17 sections (of which 12 contain RCA) were subjected to an extensive field testing program, consisting of pavement condition surveys, drainage surveys, falling weight deflectometer (FWD) testing, coring, and serviceability assessments.
The book is an ideal source of information on the subject and would be a suitable addition to any library as a resource for researchers seeking to develop an overview of the research on this topic.
"This report provides technical information on pervious concrete's application, design methods, materials, properties, mixture proportioning, construction methods, testing, and inspection. The term 'pervious concrete' typically describes a near-zero-slump, open-graded material consisting of portland cement, coarse aggregate, little or no fine aggregate, admixtures, and water." [p. 1]
Concrete is the most used man-made material in the world since its invention. The widespread use of this material has led to continuous developments such as ultra-high strength concrete and self-compacting concrete. Recycled Aggregate in Concrete: Use of Industrial, Construction and Demolition Waste focuses on the recent development which the use of various types of recycled waste materials as aggregate in the production of various types of concrete. By drawing together information and data from various fields and sources, Recycled Aggregate in Concrete: Use of Industrial, Construction and Demolition Waste provides full coverage of this subject. Divided into two parts, a compilation of varied literature data related to the use of various types of industrial waste as aggregates in concrete is followed by a discussion of the use of construction and demolition waste as aggregate in concrete. The properties of the aggregates and their effect on various concrete properties are presented, and the quantitative procedure to estimate the properties of concrete containing construction and demolition waste as aggregates is explained. Current codes and practices developed in various countries to use construction and demolition waste as aggregates in concrete and issues related to the sustainability of cement and concrete production are also discussed. The comprehensive information presented in Recycled Aggregate in Concrete: Use of Industrial, Construction and Demolition Waste will be helpful to graduate students, researchers and concrete technologists. The collected data will also be an essential reference for practicing engineers who face problems concerning the use of these materials in concrete production.
Evaluates the feasibility of using concrete containing recycled concrete aggregate (RCA) and fly ash in concrete pavement applications. Produces two batches of different concrete mixtures in the laboratory, with each batch containing 0%, 25% of RCA with 0%, 10%, and 15% fly ash (by weight) cured with two cure durations. Cement water ratio for the first batch is 0.55, and for the second batch, 0.45. Discusses the effects of RCA and fly ash on the compressive strength, modulus of electricity, and flexural strength.
Virgin aggregate is being used faster than it is being made available creating a foreseeable shortage in the future. Despite this trend, the availability of demolished concrete for use as recycled concrete aggregate (RCA) is increasing. Using this waste concrete as RCA conserves virgin aggregate, reduces the impact on landfills, decreases energy consumption and can provide cost savings. However, there are still many unanswered questions on the beneficial use of RCA in concrete pavements. This research addresses the many technical and cost-effective concerns regarding the use of RCA in concrete pavements by identifying concrete mixture and proportioning designs suitable for jointed plain concrete pavements; constructing test sections using varying amounts of RCA; monitoring performance through testing, condition surveys and sensor data; modeling RCA pavement performance; and predicting life cycle costs. The research was carried out as a partnership between the Centre for Pavement and Transportation Technology (CPATT) at the University of Waterloo, the Cement Association of Canada, Dufferin Construction, and the Natural Sciences and Engineering Research Council of Canada.rgin aggregate increase as the sources becomes depleted. Multivariable sensitivity analysis showed that the LCCA results were sensitive to construction costs, discount rate, and maintenance and rehabilitation quantities.
ABSTRACT: Our study evaluated the feasibility of using concrete containing recycled asphalt pavement (RAP) in concrete pavement applications. Concrete containing 0[percent], 10 [percent], 20[percent] and 40[percent] of RAP were produced in the laboratory, and evaluated for their properties which are relevant to performance of concrete pavements. Using the measured properties of these concretes containing RAP, finite element analysis was then performed to determine how the concretes containing different amounts of RAP would perform if it were used in a typical concrete pavement in Florida. Results of the laboratory testing program indicate that compressive strength, splitting tensile strength, flexural strength and elastic modulus of the concrete decrease as the percentage of RAP increases. The coefficient of thermal expansion appears to increase slightly with the use of one RAP, and decrease slightly with the use of a second RAP. The drying shrinkage appears to increase slightly with increasing RAP content. When analysis was performed to determine the maximum stresses in a typical concrete pavement in Florida under critical temperature and load conditions, the maximum stress in the pavement was found to decrease as the RAP content of the mix increases, due to a decrease in its elastic modulus. This indicates that using a concrete containing RAP can result in improvement in the performance of concrete pavements.