Author: Guy Edward SalinasPublisher:
ISBN:
Category :
Languages : en
Pages : 340
Book Description
Optimizing High Performance Concrete for Processing Ultra Thin Bonded Concrete Overlays on Airport Pavements
Author: Guy Edward SalinasDevelopment, Characterization and Performance of Early-high Strength Concrete Mixes for Bonded Concrete Mixes for Bonded Concrete Overlays
Author: Julio Cesar Paniagua FernandezPublisher:
ISBN: 9781369616293
Category :
Languages : en
Pages :
Book Description
Pavement rehabilitation using concrete has been difficult to program because of its long curing time and its initial high cost compared. Road users in California have low tolerance for delays during pavement rehabilitation. The California Department of Transportation (Caltrans) is interested in developing bonded-concrete overlays on asphalt (BCOA) as a potential rehabilitation alternative for distressed asphalt pavement. BCOA is defined herein as jointed plain concrete overlay placed on asphalt pavement with slab thicknesses between 100 to 175 mm, and slabs that are smaller than often used 3.7m lane-width lane. The slabs are intended to function as a bonded concrete overlay meaning that the concrete bonds to the underlying asphalt layer so that they behave as a monolithic layer. In the conception of thin BCOA technology, the asphalt base contributes to the structure’s stiffness by bonding with the PCC slabs to form a composite slab where both layers work together to resist bending. Caltrans specifies a minimum flexural strength of 2.8 MPa (400 psi) for concrete slabs prior to opening to highway traffic. The work done at the University of California Pavement Research Center (UCPRC) presented in this thesis is a part of Caltrans’ sponsored Strategic Plan Element (SPE) 4.58b, which intends to help solve this issue for Caltrans by developing a guide and recommendations on the use of thin BCOA as a rehabilitation alternative in California. This report is focused on evaluating the development, design and performance for the EHSC mixes to be used for BCOA test sections to be subjected to full-scale accelerated pavement testing (APT). Two type of mixes were created according to selected time windows to open to traffic. The concrete mixes for the night closure required an opening time (OT) to traffic of 4 hours which defined in this document as 4H-OT. Meanwhile the mixes for the weekend closure require an OT to traffic of 10 hours, these mixes are defined as 10H-OT. Two mixes were designed for each of the time windows. Portland cement Type III and calcium sulfo-aluminate (CSA) were used to design the 4H-OT mixes. Both 10H-OT mixes used the same portland cement Type II/V and the difference between the two 10H-OT mixes is the use of Light Weight Aggregate (LWA) instead of a portion of conventional sand. The thesis is intended to advance current knowledge by answering questions and explaining concepts such as properties of different cementitious materials, minimum strength requirements, optimization of mixing procedures, prediction of flexural and compressive strength, albedo properties, maturity-based predictions, and performance ranking. In order to achieve that the document include a literature review, an analysis of the main properties of different cement components, a summary of the development of the mix designs, and results and performance analysis for several tests (e.g. flexural strength, compressive strength, modulus of elasticity, maturity, shrinkage, CTE and thermal properties). The research produce a lot of important results, but these are some of the most important: - The flexural strength of the specimens prepared during construction that followed CT 524 curing procedure do not show lower strengths than the results of the ASTM test, in fact the value is within the results of the specimens following ASTM C78.- Type II and III develop the same highest strength at long term, meanwhile, in the short-term CSA mix develops the highest, and faster than the other mixes. Nevertheless, once CSA reaches the peak at a very early stage it remains steady through time.- In compressive strength, the mix with LWA perform well in the long term reaching similar values than the 10-hour mix without LWA. Nevertheless, the long-term performance in flexural strength do not get too close to the 10-hour mix without LWA.- An equation to predict flexural strength was calibrated for each of the four mixes based on tests results conducted on specimens prepared in the laboratory.
Thin and Ultra-thin Whitetopping
Author: Robert Otto RasmussenPublisher: Transportation Research Board
ISBN: 0309070198
Category : Pavements
Languages : en
Pages : 96
Book Description
TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 338: Thin and Ultra-Thin Whitetopping summarizes available information to document how state departments of transportation and others are currently using thin and ultra-thin whitetopping overlays among various pavement rehabilitation alternatives. The report covers all stages of the proper application of whitetopping overlays, including project selection, design, materials selection, construction, maintenance, and eventual rehabilitation or replacement.
Structural Overlay Strategies for Jointed Concrete Pavements
Author: Ultra-thin Portland Cement Concrete Overlay of a General Aviation Runway
Author: Anthony ManciPublisher:
ISBN:
Category : Pavements
Languages : en
Pages : 30
Book Description
Construction of a Thin-bonded Portland Cement Concrete Overlay Using Accelerated Paving Techniques
Author: Kenneth H. McGheePublisher:
ISBN:
Category : Pavements, Concrete
Languages : en
Pages : 32
Book Description
The report describes the Virginia Department of Transportations' first modern experience with the construction of thin-bonded Portland cement concrete overlays of existing concrete pavements and with the fast track mode of rigid paving. The study was conducted in cooperation with the Federal Highway Administration (FHWA) and used a paving mixture verified in an FHWA mobile laboratory. The study showed that the fast track mode will permit lane closure times as short as 48 hours. Of special interest was the finding that adequate strength of the bond between the old pavement and the overlay is not dependent on the use of a bonding grout.
Field Performance of Bonded Concrete Overlays
Author: Gerald F. VoigtPublisher:
ISBN:
Category : Pavements
Languages : en
Pages : 42
Book Description
Techniques and Procedures for Bonded Concrete Overlays
Author: Manuel TreviñoPublisher:
ISBN:
Category : Pavements
Languages : en
Pages : 230
Book Description
Thin Bonded Concrete Overlays
Author: Construction of a Thin, Bonded Concrete Overlay
Author: Richard H. ObuchowskiPublisher:
ISBN:
Category : Pavements
Languages : en
Pages : 54
Book Description