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Author: James Karl Cable Publisher: ISBN: Category : Concrete Languages : en Pages : 5
Book Description
Data collection to determine the rate of bond strength development between concrete overlays and existing pavements and the evaluation of nondestructive testing methods for determining concrete strength were the objectives of this study. Maturity meters and pulse velocity meters were employed to determine the rate of flexural strength gain and determine the time for opening of newly constructed pavements to traffic. Maturity measurements appear to provide a less destructive method of testing. Pulse velocity measurements do require care in the preparation of the test wells and operator care in testing. Both devices functioned well under adverse weather and construction conditions and can reduce construction traffic delay decisions. Deflection testing and strain gaging indicate differences in the reaction of the overlay and existing pavement under grouting versus nongrouted sections. Grouting did enhance the rate of bond development with Type I11 cement out performing the Type I1 grout section. Type I11 and Type I1 cement grouts enhanced resistance to cracking in uniformly supported pavements where joints are prepared prior to overlays achieving target flexural strengths. Torsional and direct shear testing provide additional ways of measuring bond development at different cure times. Detailed data analysis will be utilized by TRANSTEC, Inc. to develop a bonded overlay construction guidelines report.
Author: James Karl Cable Publisher: ISBN: Category : Concrete Languages : en Pages : 5
Book Description
Data collection to determine the rate of bond strength development between concrete overlays and existing pavements and the evaluation of nondestructive testing methods for determining concrete strength were the objectives of this study. Maturity meters and pulse velocity meters were employed to determine the rate of flexural strength gain and determine the time for opening of newly constructed pavements to traffic. Maturity measurements appear to provide a less destructive method of testing. Pulse velocity measurements do require care in the preparation of the test wells and operator care in testing. Both devices functioned well under adverse weather and construction conditions and can reduce construction traffic delay decisions. Deflection testing and strain gaging indicate differences in the reaction of the overlay and existing pavement under grouting versus nongrouted sections. Grouting did enhance the rate of bond development with Type I11 cement out performing the Type I1 grout section. Type I11 and Type I1 cement grouts enhanced resistance to cracking in uniformly supported pavements where joints are prepared prior to overlays achieving target flexural strengths. Torsional and direct shear testing provide additional ways of measuring bond development at different cure times. Detailed data analysis will be utilized by TRANSTEC, Inc. to develop a bonded overlay construction guidelines report.
Author: Young Kyu Kim Publisher: ISBN: Category : Bond stress Languages : en Pages : 9
Book Description
Bonded concrete overlays have a structural advantage over unbonded concrete overlays when the overlay and the existing pavement layer behave as a monolithic layer. Therefore, it is important to ensure suitable bond strength between the two layers. Many studies have specified the bond-strength criteria for the construction of bonded concrete overlays based on a monotonic load as pull off test. However, cyclic stress at the interface of bonded concrete overlay layer occurs by the repetition of traffic loading and environmental loading caused by daily temperature changes. In this study, a strategic test procedure is developed to investigate potential bond failures caused by cyclic loading, and a bond-fatigue equation for a bonded concrete overlay was suggested. The test results indicate that early distress in bonded concrete overlay may arise because of a bond failure if the bond stress at the interface exceeds 90 % of the bond strength.
Author: Benoît Bissonnette Publisher: Springer Science & Business Media ISBN: 9400712391 Category : Technology & Engineering Languages : en Pages : 197
Book Description
Among different approaches that can be considered for concrete rehabilitation, bonded overlays are often the most economical alternative. The primary purpose of overlays is to extend the life of the candidate structures, either by restoring the quality and integrity of the surface and/or the re-establishing or improving the load-carrying capacity. Nevertheless, the durability of bonded overlay systems still draws concerns in the technical community because of bond sustainability problems encountered in a number of cases. At this time, there is still no accepted design approach or methodology that can warrant the practitioner a successful outcome of the repair. This State-of-Art report summarizes the findings with respect to all aspects involved in the overlaying process.
Author: Kenneth H. McGhee Publisher: 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.
Author: Hamdi Celik Ozyildirim Publisher: ISBN: Category : Bridges Languages : en Pages : 34
Book Description
This study evaluated latex-modified concretes (LMC) and concretes containing silica fume (SFC) or Pyrament-blended cement (PBCC) in bridge deck overlays in the field. The condition of the overlays was monitored for 4 years. LMC and SFC were placed in 2 days using a vibratory roller screed spanning half the width of the bridge, each side in 1 day. PBCC was placed in small segments, each covering half the width of the bridge, in 2 months. The placement in small segments was dictated by traffic control requirements. PBCC was used with no admixtures. Similarly, LMC was used with no admixture except the latex-modifier. The results indicate that LMC, SFC, and PBCC have low permeability and satisfactory strengths. PBCC develops high very early strengths within hours, even in cold weather, and SFC develops sufficient compressive strength for opening to traffic in 1 day. Since all three concretes are prone to plastic shrinkage, proper and immediate curing are essential.
Author: Oregon. State Highway Division Publisher: ISBN: Category : Polymer-impregnated concrete Languages : en Pages : 30
Book Description
This report describes work done on various combinations of monomers and polymer concrete mixes and identifies the mixes showing the greatest potential for use in bridge deck overlays. Presented are test results showing physical properties of various polymer concrete mixes, such as compressive strength, split tensile strength, modulus of elasticity, thermal coefficient of expansion, and shrinkage coefficient. The effects of polymer content, work time, and temperature on various properties are also discussed. The development of two polymer concrete systems with excellent membrane potential are described along with the details of bonding characteristics of several systems. Finally, a polymer concrete mix with suitable properties for deck and pavement patching is detailed.
Author: Łukasz Sadowski Publisher: Springer ISBN: 3030037835 Category : Technology & Engineering Languages : en Pages : 163
Book Description
This book discusses how to identify the level of adhesion in layered systems made of cement composites using a multi-scale approach based on experimental and numerical analyses. In particular, it explains 1. The suitability of previously used artificial intelligence tools and learning algorithms for reliable assessment of the level of adhesion of layered systems made of cement composites based on non-destructive tests 2. The development of the methodology for a reliable non-destructive evaluation of the level of adhesion in newly constructed layered systems of any overlay thickness and in existing layered systems made of cement composites 3. How to determine whether to assess the level of adhesion of the layered systems, and discusses the amplitude parameters, spatial, hybrid and volume parameters describing the morphology of the concrete substrate surface in the mesoscale 4. How to ascertain whether the effective surface area of the existing concrete substrate and the contribution of the exposed aggregate on this substrate, determined in mesoscale, have an impact on the level of adhesion of layered systems made of cement composites 5. The assessment of the structure of air pores in the microscale and the chemical composition of the cement composite on the nanoscale in the interphase zone together with the determination of their impact on the level of adhesion of layered systems made of cement composites 6. The development of an effective methodology for testing the level of adhesion of layered systems made of cement composites in a multi-scale approach, including the research methods and descriptors used.
Author: Julio Cesar Paniagua Fernandez Publisher: 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.
Author: James Karl Cable
Author: James Karl Cable
Author: Young Kyu Kim
Author: Benoît Bissonnette
Author: Kenneth H. McGhee
Author: Hamdi Celik Ozyildirim
Author: Robert D. Stark (University of Manitoba student)
Author: Oregon. State Highway Division
Author: Łukasz Sadowski
Author: Jamal Anwar
Author: Julio Cesar Paniagua Fernandez