the use of fiber reinforced plastic for the repair and strengthening of existing reinforced conc
standard practice for the use of shrinkage- compensating concrete
... of hydration or temperature rise depends on the characteristics and type of the portland cement portion In general, the heat of hydration falls within the range of the variation of the heat of ... early, the expansion of the base slab, along with the shrinkage of the topping, will weaken the bond between the two slabs and cause a delamination of the topping After the 7-day delay period, the ... Guide for Measuring, Mixing, Transporting, and Placing Concrete Hot Weather Concreting Cold Weather Concreting Building Code Requirements For Reinforced Concrete Guide to Formwork for Concrete...
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guide for the use of preplaced aggregate concrete for structural and mass concrete applications
... view of the lack of any performance history, the use of PA concrete was limited to the repair of bridges and tunnel linings to extend their usefulness After extensive laboratory testing, the Bureau ... requirements limit the amount of fine aggregate (sand) that can be used in the grout For PA concrete for use in beams, columns, and thin sections, the ratio of cementitious material to sand 304.1R-8 ... conventional concrete, heat of hydration is related to the type and amount of portland cement and other cementitious materials in the mixture The temperature rise depends upon the amount and rate of heat...
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guide for the use of polymers in concrete
... on the effects of polymers used in concrete on the properties of concrete, and to prepare a guide for their use This mission has now been changed to simply “Report information on the use of polymers ... film The formation of the polymer film retards the loss of water from the concrete thus making it available for hydration of the cement Moist curing of PMC is required during the early stages of ... BPO) and granular-powder forms (35 to 50percent BPO) For ease of handling and safety purposes, the balance of these formulations is generally a plasticizer or inert filler Purer forms of BPO (for...
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state-of-the-art report on fiber reinforced concrete
... for fiber reinforced concrete These fibers are categorized as synthetic fibers for use in synthetic fiber reinforced concrete, SNFRC for identification 4.1.1—Synthetic fiber types Synthetic fibers ... aspect ratio of the fibers, the volume percentage of fibers, the maximum size and gradation of the aggregates, and the method of adding the fibers to the mixture As the first three of these factors ... For structural concrete, ACI 318 does not provide for use of the additional tensile strength of the fiber reinforced concrete in building design, and therefore the design of reinforcement must...
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USE OF MINIMAL LEXICAL CONCEPTUAL STRUCTURES FOR SINGLE-DOCUMENT SUMMARIZATION doc
... prepositional phrase is the least important E.g in The prince of the smallest country in the world”, ”in the world” is probably the least important part of the phrase Therefore, while the sentence is ... facilitates laymen and professionals in accessing information that is authored in a language they not understand PLANS FOR THE NEXT YEAR, IF CHANGED We intend to continue the integration of depTrimmer ... a license for English and Spanish parsers Update the host/port in the files fdges-client.pl (for Spanish) and fdgen-client.pl (for English) The current values should look like this for fdges-client.pl:...
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design considerations for steel fiber reinforced concrete
... DESIGN OF STEEL FIBER REINFORCED CONCRETE strength of the matrix; the size, shape, and method of preparation of the specimen; and the size of the aggregate For this reason, mixtures proposed for use ... variables governing the properties of steel fiber reinforced concrete are the fiber efficiency and the fiber content (percentage of fiber by volume or weight and total number of fibers) Fiber efficiency ... strengthening mechanism of the fibers involves transfer of stress from the matrix to the fiber by interfacial shear, or by interlock between the fiber and matrix if the fiber surface is deformed...
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guide for specifying, proportioning, mixing, placing, and finishing steel fiber reinforced concrete
... Requirements for Reinforced Concrete 347-R Guide to Formwork for Concrete 506.1R State -of -the- Art Report on Fiber Reinforced Shotcrete 544.1R State -of -the- Art Report on Fiber Reinforced Concrete 544.2R ... inside of sharp comers in the forms On formed surfaces, use of a form vibrator will cause the fibers to back away from the form, leaving them covered by about 1/8 in (3 mm) of concrete Formwork ... mixing, placing, and finishing of steel fiber reinforced concrete (SFRC) 1.2 Steel fiber reinforced concrete General Steel fiber reinforced concrete is a composite material made of hydraulic...
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measurement of properties of fiber reinforced concrete
... 231-82 C 293-79 Standard Specification for Steel Fibers for Fiber Reinforced Concrete Standard Practice for Making and Curing Concrete Test Specimens in the Field Standard Test Method for Compressive ... Finishing Steel Fiber Reinforced Concrete SP-44 Fiber Reinforced Concrete SP-81 Fiber Reinforced Concrete-International Symposium SP-109 Fiber Reinforced Concrete Properties and Applications ASTM A 820-85 ... that although the slumps of these two mixtures are similar, the workabil- PROPERTIES OF FIBER REINFORCED CONCRETE 544.2R-3 ity of the FRC mixture was much better The advantage of the inverted...
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Size dependent mechanical behavior of ultra high performance fiber reinforced concrete
... SS -fiber, and UHPFRC2 with 1.0% Tfiber and 1.0% SS -fiber The length and diameter of the T-fibers were 30 mm and 0.3 mm, respectively, while the length and diameter of the SS-fibers were 13 mm and 0.2 ... regarding the size effect on fiber- reinforced cement composite or fiber- reinforced concrete Chandrangsu and Naaman [26] investigated the size effect on high-performance fiber- reinforced cementitious composites ... LOP and M LOP are the curvature and moment at the LOP, MOR and M MOR are the curvature and moment at the MOR, k is the shear coefficient, is Poisson’s ratio, and h and L are the depth of the...
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Carbon fiber reinforced concrete (Carbocrete)
... Thomas Edison was the first to use carbon fibers as filaments for early light bulbs It lacked the high tensile strength of today’s carbon fibers; however he used it because of their high tolerance ... high-performance carbon fibers was manufactured by Mitsubishi Rayon The USA’s Air Force and NASA didn’t wait develop the carbon fiber technology and began to use carbon fiber reinforced polymers to ... in the early 1990s, researches showed that carbon fibers can be used inside the concrete instead of steel reinforcement showing a significant improvement in the flexural and tensile strength of...
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Symbiotic hollow fiber membrane photobioreactor for microalgal growth and activated sludge waste water treatment
... exchange performance The periodical substitution of fiber bundles also benefits the reusability and the life span of the fibers Another important advantage of the symbiotic hollow fiber membrane ... One of these is the use of hollow fiber membranes to isolate the microbes in the activated sludge from the microalgae, and for gas exchanges between the microalgae and activated sludge growth The ... cultures of C vulgaris and P putida Chapter presents the results on proof - of – concept of the symbiotic HFMP and an analysis of the effects of operating parameters on the symbiotic HFMP performance...
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Dual layer hollow fiber membrane development for forward osmosis and osmosis power generation
... using the 200µm-side of the first casting knife; (2) put the dense layer dope on top of the substrate layer; (3) use the 250µm-side of the second casting knife for the dense layer and hold the ... and the inner dope were premixed before exiting the spinneret in order to improve the integration of the two layers After that, the dopes and the bore fluid met at the tip of the spinneret, and ... integration of the two layers After that, the dopes and the bore fluid met at the tip of the spinneret, and then passed through an air gap region before entering the coagulation (water) bath Finally, the...
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Non-metallic biomaterials for tooth repair and replacement doc
... Reasonable efforts have been made to publish reliable data and information, but the authors and the publisher cannot assume responsibility for the validity of all materials Neither the authors nor the ... known, because of its shape, as the ‘bell stage’ of tooth development (ca 14th week of intrauterine life), the epithelial cells on the inside of the bell align with a concentration of mesenchyme ... from the epithelial cells to the mesenchyme cells The epithelial cells begin to elongate and transform into ameloblasts, and the mesenchyme cells transform into odontoblasts (Nanci, 2008) The...
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control of deflection in concrete structuresstate-of-the-art report on fiber reinforced plastic (frp) reinforceme
... shape and composition of the fibers, the mechanical properties of the resin matrix, and the adhesion of the bond between the fibers and the matrix 2.2 The importance of the polymer matrix Most ... are the tensile strength of the plate, the interlaminar shear strength of the adhesive between the concrete and the plate, and the shear failure of the concrete immediately above the adhesive The ... bars The study used test results to determine if the theory used for steel reinforced concrete can be used to predict the performance of concrete beams reinforced with GFRP reinforcing bars Four...
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Assessment of the Use of Hand Warmer for Nitrate Retardation in Porous Media
... amount of HWCs while there is a slight change of the peak concentration in Andisol (Fig (b)) except for the more pronounced tailing of the BTCs with the increase of HWCs The peak concentrations for ... migration due to the aggregate structure and the geometry of the interfaces CONCLUSIONS This study focused on the possible reuse of used hand warmer contents (HWCs) for retarding and spreading nitrate ... column to keep the moisture content inside the column uniform while water was sprinkled over the top of the medium until the outflow from the bottom of the column equaled the volume of the water input...
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Effects of the Use of Permeable Barrier for Landfill Leachate Treatment
... 40:20:40, the highest efficiency for COD and TP removal can be acquired at a rate of 84.87% and 80% for COD and TP, respectively The experiment indicated that the use of PRB is highly effective for landfill ... saturated and disabled as a reaction medium Reactor Efficiency for Total Phosphorus (TP) Removal Fig illustrates the efficiency of the reactors for the removal of TP The highest efficiency for the ... Journal of Water and Environment Technology, Vol 9, No.2, 2011 RESULTS AND DISCUSSION Reactor Efficiency for Ammonium Removal Fig illustrates the efficiency of the reactors for the removal of ammonium...
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A STUDY ON THE USE OF CLASSROOM DISCIPLINE AS MOTIVATION FOR SECOND LANGUAGE ACQUISITION IN THE CONTEXT OF ENGLISH LANGUAGE TEAC
... language and their knowledge of the second language, the dialect of the native language spoken by the students (i.e., whether it is standard or nonstandard), the relative status of the students' ... look at themselves and become more aware of their responsibilities during the class hours This will them more good than otherwise Another part of the survey was feasible in the form of interviews, ... be a composite of the classroom itself, the lesson routines, the audio-visual aids, etc The triangle of the teacher, the learner and the environment are the ultimate subjects concerning classroom...
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The Use of Plant Cell Biotechnology for the Production of Phytochemicals
... relatively easy to perform One of the major applications of genome sequencing of plants is functional genomics In simple words, an understanding of the function of genes and other parts of the genome is ... (for the supply of natural fungicides and insecticides), nutrition (for the acquisition of natural substances used for flavoring and coloring foods), and cosmetics (natural fragrances and oils) The ... molecular biology and biochemistry led to rapid advances in the identification of biosynthetic genes, the elucidation of specific biosynthetic enzymes, and the identification of end-products The complete...
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The Use of Selected Medicinal Herbs for Chemoprevention and Treatment of Cancer, Parkinson’s Disease, Heart Disease, and Depression
... aspects of study design, performance, and analysis, with a focus on randomization of the study subjects, blinding of the investigators and study subjects, and the handling of dropouts and withdrawal ... and Holroyd, 2000), a member of the Hypericaceae family Its yellow flower has been gathered for the feast of St John the Baptist and the word “wort” is the Old English word for plant (Gaster and ... 2004), it is not known whether digoxin will remain as the standard therapy for heart failure (Hauptman and Kelly, 1999) In the future, there might be other uses for digitoxin There is evidence that...
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Development of a Regional Risk Management Framework for APEC Economies for use in the Control and Prevention of Introduced Marine Pests
... management capabilities and approaches Priorities and hazards for APEC Economies Considerations for a Risk Management Framework Conclusions, including the results of the November 2001 Workshop ... capabilities and approaches APEC and the MRCWG have a role in liaising with IMO, FAO, NACA to enhance the effectiveness of existing instruments within APEC Institutional arrangements for managing the ... limited and unbalanced Management Framework - Introd uced Marine Pests Priorities and hazards for Economies Variable levels of activity and management capability Ships’ ballast water and hull...
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