— corrosion protection for unbonded tendons

Ngày tải lên: 17/03/2014, 16:20

... 3.9—Design strength 3.10—Anchorage zone reinforcement Chapter 4—Materials, p 423.3R-14 4.1 Tendons 4.2 Protection materials 4.3 Protection of anchorage zones 4.4—Concrete cover Chapter 5—Construction, ... 5.1—Construction joints 5.2—Closure strips 5.3—Placement of tendons 5.4—Concrete placement and curing 5.5—Stressing operations 5.6—Form removal and reshoring 5.7—Welding and burning Chapter 6—References, ... concrete 4.2 Protection materials 4.2.1 Coating7 Unbonded single strand tendons should utilize a corrosion inhibiting coating in conformance with the Post-Tensioning Institute “Specification for Unbonded...

Ngày tải lên: 24/10/2014, 22:00

... 2.4.1—General properties 2.4.2—Type of coating 2.4.3—Minimum quantity 2.4.4—Performance criteria Part 3—Execution, p 423.6/423.6R-22 3.1—General 3.2—Tendon installation 3.2.1—General 3.2.2—Stressing-end ... of tendons 3.3.4—Sheathing repair 3.4—Tendon stressing 3.4.1—General 3.4.2—Jack calibration 3.4.3—Elongation measurement 3.5—Tendon finishing 3.5.1—General 3.5.2—Aggressive environments 3.5.3—Stressing ... 1.7.1—Delivery 1.7.2—Handling and storage Part 2—Products, p 423.6/423.6R-11 2.1—Prestressing steel 2.1.1—General 2.1.2—Acceptance criteria for surface condition 2.1.3—Compliance requirements 2.2—Anchorages...

Ngày tải lên: 24/10/2014, 22:00

... National Council on Radiation Protection and Measurements Radiation protection for medical and allied health personnel : recommendations of the National Council on Radiation Protection and Measurements ... this report provide general information on radiation and its uses in medicine for all readers Section 8, Specific Guidelines, provides pertinent job related information for personnel involved with ... set forth in NCRP Report No 82, SI Units in Radiation Protection and Measurements (NCRP, 1985a) iv / PREFACE This report was prepared by Scientific Committee 46-6 on Radiation Protection for...

Ngày tải lên: 15/03/2014, 06:20

... the informal sector The outcome in terms of additional informality will depend on the relative productivity of the formal and informal sectors If productivity (and, therefore, wages) in the formal ... constraints that make it hard for workers to have access to quality jobs Training—the main form of support offered in these programs—is often supply driven and it benefits mostly formal sector workers ... benefits from formality for the workforce and thus have encouraged the evasion of social security In the twenty-first century, more than half of LAC’s workforce is employed in the informal sector...

Ngày tải lên: 22/03/2014, 16:21

... and flexion forces on the neck that can occur with forward-facing occupants (figure 4B) Further explanation and field validation of this injury risk are discussed in the context for forward-facing ... airbag forces,18 the only reliable ways to protect an infant from airbag injury are to disconnect the bag or to restrain the child in the rear seat Back Angle for Frontal Impact Protection For reasonable ... impact protection for children, however, indicates that this feature may be a disbenefit for the center or nonstruck side, but that a flexible vs a rigid installation is probably not significant for...

Ngày tải lên: 23/03/2014, 10:20

... domain, its patent protection leverages the extensive protection of its entire content DIGITAL LIbRARy PROTECTION In this section, we present the formulation of digital library protection that uses ... level of security In all cases, authentication is used to enforce property protection, and may be specifically intended for the copyright protection of digital contents published on the Internet ... area of information technology is to allow easy access to the tools for protection against multimedia intellectual property infringement that is negative side effect of innovation in the information...

Ngày tải lên: 23/03/2014, 10:20

... cleanup efforts and/or the theft of a business' private, personal, and confidential digital information Security professionals understand that these gaps exist and represent risks for them In ... that analyzes network traffic up to the application layer for signs of embedded malware The Trend Micro solution performs ongoing monitoring for any active malware activity that may be in the process ... into single streams Single-session correlation is performed on the network streams, scanning the traffic for exploits and network worms and performing reputation scans on embedded files and URLs...

Ngày tải lên: 28/03/2014, 22:20

... They estimated the various forces that operate during polymer deformation for one system, in which a force of 10 −7 N would be required for particle deformation The forces generated by capillary ... TABLE 3.1 Estimates of Forces Operating During Particle Deformation Type of Force Operating Gravitational force on a particle Van der Waals force (separation nm) Van der Waals force (separation 0.2 ... there are a number of theories — or more accurately, schools of theories — to describe it A major point of difference among them is the driving force for particle deformation: surface tension of...

Ngày tải lên: 21/06/2014, 22:20

... lead to blistering and that, therefore, only inhibitors that not form hygroscopic salts should be used for wet blasting McKelvie [11] does not recommend inhibitors for two reasons First, flash rusting ... abrasives can be used to prepare steel for maintenance coatings For example, novaculite and flint contain high amounts of free silica, which makes them unsuitable for most blasting applications Garnet ... February 3, 2006 12:37 PM 70 Corrosion Control Through Organic Coatings the heavy mineral sands are effective for blast cleaning new steel but are not the best choice for maintenance applications...

Ngày tải lên: 21/06/2014, 22:20

... debris Sulfides — for example, sodium sulfide — react with the metals in the debris to form metal sulfides, which have a low solubility (much lower, for example, than metal hydroxides) Lead, for example, ... (LTA) can be used on oxidizable blasting debris — for example, plastic abrasive — to achieve a high degree of volume reduction in the waste Trials performed with this technique on plastic abrasive ... Friday, February 3, 2006 12:38 PM 86 Corrosion Control Through Organic Coatings 5.1.1 CHEMICAL ANALYSIS TECHNIQUES FOR HEAVY METALS Several techniques are available for determining whether or not toxic...

Ngày tải lên: 21/06/2014, 22:20

... result — no correlation between airborne chemicals and corrosion of painted metal — was seen [40] The corrosion rate of bare steel in Sheffield was about four times that at Calshot, but the performance ... a very real effect on coating performance If a coating forms high levels of internal stress during cure — not uncommon in thick, highly crosslinked coatings — then applying other stresses during ... coating-metal interface in sufficient numbers to force the film up from the metal substrate The two types of blistering in anticorrosion paints — alkaline and neutral — are caused by different mechanisms...

Ngày tải lên: 21/06/2014, 22:20

... with how uniformly the corrosion is accelerated for a set of samples It is desirable, of course, for an acceleration test to accelerate the corrosion rate more or less uniformly for all the samples; ... 11:01 AM Corrosion Testing — Practice 131 which provides requirements for materials selection, surface preparation, paint application, inspection, and so on for coatings used on offshore platforms ... as unrealistically harsh for latex coatings 8.1.4.2 Volvo Indoor Corrosion Test or Volvo-cycle The VICT [6] was developed — despite its name — to simulate the outdoor corrosion environment of...

Ngày tải lên: 21/06/2014, 22:20

... al [10] They proposed a method for storing original privacy information in video using information hiding technique, and it can recover the original privacy information if necessary However, ... privacy information must be embedded to recover the original image since the privacy information is obtained from the whole information of the object regions Even if all the privacy information ... recoverable privacy protection Their method masks a real face (privacy information) with a virtual face (newly generated face for anonymity) To deal with the huge payload problem of privacy information...

Ngày tải lên: 22/06/2014, 00:20

... informal sector—who constitute a majority of the workforce—are excluded from the mainstream contributory pension systems that were designed for formal workers, and lack safety nets 6 Social Protection ... drivers for reform, and which factors determine 14 Social Protection for Older Persons whether proposed reforms are implemented and consolidated These political dimensions of policy reform are ... Table 1.1 Analyzing Social Policy Reform Processes Internal Reform Drivers External Reform Drivers Reform Process Political system • Institutions (formal/informal) • Actors • Electoral/party system...

Ngày tải lên: 27/06/2014, 09:20

... overoxidation state and loses the conductivity Corrosion Protection of Steels by Conducting Polymer of PPy 3.1 Mechanism of Corrosion Protection For the corrosion protection, two mechanisms have been proposed; ... the pitting corrosion by chloride attack 3.3 Design for Corrosion Protection by the PPy The anodic protection greatly depends on the passivity and passive oxide on the steel For the protection, ... form homogeneous and adherent layers of conducting polymer on steels and other metals For the corrosion protection, we must consider the design of the conducting polymer Since the corrosion protection...

Ngày tải lên: 27/04/2015, 08:57

... 6000 10 10000 Polymers as Corrosion Inhibitors for Metals in Different Media Table The Open Corrosion Journal, 2009, Volume Inhibition Efficiency for C-Steel in 0.5N HCl for Polyethylene Glycols ... voltammetry have been used for the study of corrosion rates for the corrosion of aluminium in acidic medium at short time intervals Results obtained showed that the corrosion inhibition efficiency ... amines have been studied as an efficient corrosion inhibitor for iron in acid media The performance of water soluble polyaniline as corrosion inhibitor for iron in 0.5M H2SO4 has been evaluated...

Ngày tải lên: 27/04/2015, 09:08

... metal roofs and reinforced concrete panel walls It is further assumed that Earthing, Lightning & Surge Protection Forum – IDC Technologies Session Ten: Lightning Protection for Industrial Plants ... and signal lines Figure Risk Assessment, no protection Earthing, Lightning & Surge Protection Forum – IDC Technologies Session Ten: Lightning Protection for Industrial Plants Figure Risk Assessment, ... Whatever Earthing, Lightning & Surge Protection Forum – IDC Technologies Session Ten: Lightning Protection for Industrial Plants it represents we need to provide protection such that everything within...

Ngày tải lên: 20/09/2015, 17:38