Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Curing Practices To Reduce Plastic Shrinkage In Concrete Bridge Decks
Download Curing Practices To Reduce Plastic Shrinkage In Concrete Bridge Decks full books in PDF, epub, and Kindle. Read online Curing Practices To Reduce Plastic Shrinkage In Concrete Bridge Decks ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Curing Practices to Reduce Plastic Shrinkage in Concrete Bridge Decks by : Steven W. Peyton
Download or read book Curing Practices to Reduce Plastic Shrinkage in Concrete Bridge Decks written by Steven W. Peyton and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The large, exposed area of concrete bridge decks makes proper curing critical and difficult. Plastic shrinkage cracks are common in improperly cured bridge decks. The objective of this research was to identify curing regimens that successfully reduce plastic shrinkage cracking. This was accomplished by surveying Arkansas Highway and Transportation Department engineers to determine the current construction practices on Arkansas bridge decks, documenting the curing of five bridge decks under construction, and studying the effectiveness of curing regimens in the laboratory. The survey responses show inconsistencies in the interpretations of the construction specifications that were also evident in the field study. Delayed curing, high evaporation rate, and increased girder deflection increased the likelihood of cracking in the decks. Inconsistent application of curing materials caused increased cracking in the laboratory study. Removing impediments, such as tined finishes, to timely curing and clarifying curing specifications would reduce cracking in bridge decks."--Project summary.
Book Synopsis Curing Practices to Reduce Plastic Shrinkage in Concrete Bridge Decks by : Steven Wayne Peyton
Download or read book Curing Practices to Reduce Plastic Shrinkage in Concrete Bridge Decks written by Steven Wayne Peyton and published by . This book was released on 2006 with total page 380 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mitigating Shrinkage Cracking of Concrete in Bridge Decks Through Internal Curing by : Daniel Robert Goad
Download or read book Mitigating Shrinkage Cracking of Concrete in Bridge Decks Through Internal Curing written by Daniel Robert Goad and published by . This book was released on 2013 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the need for durable, long lasting infrastructure increases, new methods and techniques are being explored to prolong the service life of roads and bridges. One method to reduce shrinkage and early age cracking in concrete is internal curing. Internal curing supplies water to concrete, using pre-wetted lightweight aggregate (LWA), as needed throughout the process of hydration to reduce self desiccation, which leads to cracking. This research project analyzed two types of coarse LWA, expanded clay and expanded shale. The mixtures were developed specifically for use in bridge decks and adhered to specifications of the Arkansas State Highway and Transportation Department (AHTD). The concrete mixtures contained LWA at rates of 0, 100, 200, and 300 lb/yd3. The research was divided into two phases. The first phase measured autogenous and drying shrinkage in both plastic and elastic states using embedded vibrating wire strain gages (VWSG) cast in concrete prisms. The expanded clay LWA mixtures, with the 300 lb. replacement rate yielding the best results, were most effective in reducing shrinkage. Compressive strength decreased as the amount of LWA included in the mixture increased. However, all mixtures surpassed the 28 day compressive strength specified by AHTD. The second phase of the research project measured plastic shrinkage cracking in thin concrete test slabs. Methods and materials were investigated to produce consistent plastic shrinkage surface cracks of the concrete slabs. The extent of plastic shrinkage that occurred was quantified by measuring the total crack area of the test slabs. Implementation of 300 lb. of expanded clay LWA did not reduce the crack lengths, but did reduce the average crack widths experienced by the test slabs due to plastic shrinkage.
Book Synopsis Low Shrinkage Mix Designs to Reduce Early Cracking of Concrete Bridge Decks by : Eric Simonton
Download or read book Low Shrinkage Mix Designs to Reduce Early Cracking of Concrete Bridge Decks written by Eric Simonton and published by . This book was released on 2020 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract Shrinkage cracking is reducing the service life of concrete bridge decks in South Dakota due to premature deterioration. In this study, the effects of varying concrete mix design parameters on autogenous and drying shrinkage was observed. Tested mix design changes include aggregate type (limestone and quartzite) and gradations (ASTM C33, Tarantula Curve, and 0.45 Power Curve), supplementary cementitious materials (fly ash), cementitious content, water-to-cementitious ratio, internal curing using saturated lightweight aggregates (expanded shale), and shrinkage reducing admixtures. These changes were evaluated for their effect on the shrinkage of paste, mortar, and concrete as measured by ASTM C1698 (autogenous shrinkage) and ASTM C157 (drying shrinkage). Fresh property tests, compressive strength, and electrical resistivity measurements were performed on each mix as well. A survey of state Department of Transportations revealed the current state-of-the-art practices on shrinkage reduction in bridge decks, including the use of admixtures, internal curing agents, and external curing methods.
Book Synopsis Effects of Curing on Bridge-deck Concrete Shrinkage Cracking by : Ronald A. Lorini
Download or read book Effects of Curing on Bridge-deck Concrete Shrinkage Cracking written by Ronald A. Lorini and published by . This book was released on 1995 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Reducing Cracks in Concrete Bridge Decks Using Shrinkage Reducing Admixture by : Harikrishnan Nair
Download or read book Reducing Cracks in Concrete Bridge Decks Using Shrinkage Reducing Admixture written by Harikrishnan Nair and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Restrained shrinkage cracking of concrete bridge decks creates a significant durability problem. Major admixture suppliers in the United States have introduced a new category of chemical admixtures called shrinkage reducing admixtures (SRAs). SRAs work by reducing the surface tension of pore water and thereby decreasing the capillary stress and shrinkage induced by drying. Several studies have reported that using SRAs in concrete mixtures is one of the most effective ways of reducing shrinkage cracking. The purpose of this study was to investigate the effectiveness of SRAs in reducing drying shrinkage in Virginia Department of Transportation (VDOT) concrete mixtures and thus reducing cracks in bridge decks. Nine bridges located in VDOT's Northern Virginia, Staunton, and Fredericksburg districts were selected for study. Three different SRA products were used. With the exception of one mixture, the maximum cementitious content was limited to 600 lb/yd3. Fresh and hardened concrete properties were determined for each mixture, and field placement details were documented. The results showed that low cementitious concrete with SRA was effective in minimizing bridge deck cracking. The study showed that bridges with fewer and narrower cracks or no cracks can be constructed and that proper construction practices are needed to reduce bridge deck cracking. The study recommends the use of SRA with a lower cementitious content in VDOT bridge deck concrete mixtures. A VDOT special provision was developed for the future use of SRA in concrete mixtures.
Book Synopsis Reducing Cracks in Concrete Bridge Decks Using Shrinkage Reducing by : Harikrishnan Nair
Download or read book Reducing Cracks in Concrete Bridge Decks Using Shrinkage Reducing written by Harikrishnan Nair and published by . This book was released on 2016 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Restrained shrinkage cracking of concrete bridge decks creates a significant durability problem. Major admixture suppliers in the United States have introduced a new category of chemical admixtures called shrinkage reducing admixtures (SRAs). SRAs work by reducing the surface tension of pore water and thereby decreasing the capillary stress and shrinkage induced by drying. Several studies have reported that using SRAs in concrete mixtures is one of the most effective ways of reducing shrinkage cracking. The purpose of this study was to investigate the effectiveness of SRAs in reducing drying shrinkage in Virginia Department of Transportation (VDOT) concrete mixtures and thus reducing cracks in bridge decks. Nine bridges located in VDOT Northern Virginia, Staunton, and Fredericksburg districts were selected for study. Three different SRA products were used. With the exception of one mixture, the maximum cementitious content was limited to 600 lb/yd3. Fresh and hardened concrete properties were determined for each mixture, and field placement details were documented. The results showed that low cementitious concrete with SRA was effective in minimizing bridge deck cracking. The study showed that bridges with fewer and narrower cracks or no cracks can be constructed and that proper construction practices are needed to reduce bridge deck cracking. The study recommends the use of SRA with a lower cementitious content in VDOT bridge deck concrete mixtures. A VDOT special provision was developed for the future use of SRA in concrete mixtures.
Book Synopsis Transverse Cracking in Newly Constructed Bridge Decks by : Paul D. Krauss
Download or read book Transverse Cracking in Newly Constructed Bridge Decks written by Paul D. Krauss and published by . This book was released on 1996 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Final Report, TRC 1002, Evaluation of High Performance Curing Compounds of Freshly Poured Bridge Decks by : Sarah Tamayo
Download or read book Final Report, TRC 1002, Evaluation of High Performance Curing Compounds of Freshly Poured Bridge Decks written by Sarah Tamayo and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Shrinking cracking is a critical factor affecting the durability of concrete bridge decks. ... Plastic shrinkage cracking is the most common type of cracking to occur in concrete pavement. ... Curing compounds can help reduce ther amount of shrinking cracking"--Introduction. p. 1.
Book Synopsis Study on Reduction of Shrinkage Cracks in Bridge Deck Concrete by : Rajesh Anumakonda
Download or read book Study on Reduction of Shrinkage Cracks in Bridge Deck Concrete written by Rajesh Anumakonda and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Shrinkage is an unavoidable property of concrete that can lead to cracking, thereby limiting the serviceability of concrete structures. Shrinkage cannot be eliminated but can be minimized. Shrinkage cracking can be a critical problem in concrete construction, especially for flat slab structures such as highway pavements, industrial slab-on-grade, for parking garages, and bridge decks. The primary objective of the research is to evaluate three practical methods to reduce shrinkage cracks in concrete for bridge deck applications. The three methods evaluated are: 1) use of optimized aggregate gradation concrete, 2) use of a new high performance concrete known as low-cracking high performance concrete (LC-HPC) and 3) the use of Fibra Shield Fibers to reduce plastic shrinkage cracking in concrete.
Book Synopsis Evaluation of Concrete Deck Curing Regimens Using Capillary Pressure Sensing System by : Samuel Spann
Download or read book Evaluation of Concrete Deck Curing Regimens Using Capillary Pressure Sensing System written by Samuel Spann and published by . This book was released on 2019 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: Early-age plastic shrinkage cracking is a common problem with the construction of concrete bridge decks due to the high surface area-to-volume ratio and exposure to potentially detrimental environmental effects. Curing regimens are utilized to mitigate cracking risk during the plastic stage of the concrete; the curing regimens evaluated for this study were wet burlap-polyethylene sheeting, two acrylic curing compounds, and one lithium compound. Capillary pressure in the water filled pores has been shown to correlate to the plastic shrinkage cracking risk of concrete. A new portable system has been developed to measure the capillary pressure that could potentially be used in the field on fresh bridge deck concrete. Individual test slabs were performed to test the curing regimens using the capillary pressure sensor system (CPSS). The system contains multiple sensors that contain pressure transducers that measure the capillary pressure changes during the plastic stage. Overall, wet burlap-polyethylene sheeting was shown to be the most effective curing regimen, with the lithium curing compound performing similarly to the control slab with no curing regimen applied. Both acrylic compounds were shown to perform comparatively well, completely mitigating early-age plastic shrinkage cracking in some instances, and allowing small shrinkage cracks to form in others. While the CPSS exhibited the ability to show when cracking occurred in most cases, the magnitude of the capillary pressure at which plastic shrinkage cracks formed varied significantly across tests.
Book Synopsis Control and Repair of Bridge Deck Cracking by : Robert J. Frosch
Download or read book Control and Repair of Bridge Deck Cracking written by Robert J. Frosch and published by . This book was released on 2010-11-15 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigative Study on Common Curing Methods in Reducing Plastic Shrinkage in Concrete Slabs by : Nurul Nadiah Zulkefle
Download or read book Investigative Study on Common Curing Methods in Reducing Plastic Shrinkage in Concrete Slabs written by Nurul Nadiah Zulkefle and published by . This book was released on 2012 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Curing on Shrinkage Cracking in Bridge Deck Concrete by : Hari Shankar G. Aamidala
Download or read book Effects of Curing on Shrinkage Cracking in Bridge Deck Concrete written by Hari Shankar G. Aamidala and published by . This book was released on 2003 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Guide for Curing of Portland Cement Concrete Pavements by : Toy S. Poole
Download or read book Guide for Curing of Portland Cement Concrete Pavements written by Toy S. Poole and published by . This book was released on 2006 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transverse Cracking of High Performance Concrete Bridge Decks After One Season Or Six to Eight Months by :
Download or read book Transverse Cracking of High Performance Concrete Bridge Decks After One Season Or Six to Eight Months written by and published by . This book was released on 2006 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cracking is a major problem with newly placed concrete decks. These decks tend to develop full depth, transverse cracks and partial depth longitudinal cracks within a few months of the concrete being placed. A literature review showed that several other states had experienced similar problems. A review of data from Ohio bridge decks showed weak correlations between deck cracking and slump, time of year when the deck was placed, shrinkage, chloride permeability and compressive strength, but there was no clear relationship between cracking and any of these properties. Data also suggested that using a coarse aggregate with an absorption> 1% may help mitigate deck cracking but will not always stop it. As part of this study, 3 bridge decks were instrumented. One was a standard class "S" concrete deck and the other two were high performance concrete. The class "S" deck showed only hairline cracking after 1 year, but transverse cracking occurred in the HPC decks. Instruments were placed in the decks to monitor strains. From the data, it appears that cracking is caused by several factors. High heat of hydration caused the plastic concrete to expand. When the concrete sets and cools, tensile stressed develop. Further tensile stresses develop through drying shrinkage. Restraining the deck against normal thermal movement contributes to additional tensile stress. Autogeneous shrinkage, where high heats of hydration cause water evaporation during hydration, and plastic shrinkage may cause more tensile stress. Recommendations for mitigating cracking include using lower cement contents, adding pozzolans and retarders, using slightly higher water/cement ratios, using larger aggregates, taking steps to limit shrinkage and eliminating restraints.
Book Synopsis Maintenance and Repair Practices for Pavements by :
Download or read book Maintenance and Repair Practices for Pavements written by and published by . This book was released on 1971 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:
