1 edition of In-situ determination of moisture levels in structural concrete by modified NMR. found in the catalog.
In-situ determination of moisture levels in structural concrete by modified NMR.
1987 by U.S. Dept. of Transportation, Federal Aviation Administration, Research, Development, and Technology, Available to the public through the National Technical Information Service in McLean, Va, Springfield, Va .
Written in English
|Other titles||In situ determination of moisture levels in structural concrete by modified NMR.|
|Contributions||United States. Federal Highway Administration. Offices of Research, Development, and Technology., Southwest Research Institute.|
|The Physical Object|
|Pagination||vii, 44 p. :|
|Number of Pages||44|
The Constructor - Civil Engineering Home provides informational resources to Civil Engineers around the globe on various subjects such as construction management, Structural Engineering, Building Construction Tips, How to Guides for Civil Engineers etc. (This instrument or equipment is a non-destructive portable instrument with dimensions of x x mm and the main uses include the determination of concrete strength (either in-situ or pre-cast0, also to determine the presence of voids, cracks and other imperfections.) Ans. – pundit ultrasonic concrete tester 3.
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Geometric methods in physics
In-situ determination of moisture levels in structural concrete by modified NMR. In situ determination of moisture levels in structural concrete by modified NMR The prototype bridge deck nuclear magnetic resonance (NMR) moisture measurement system was modified to improve its usefulness and field tested in Wichita Falls, Texas, and at the FHWA Turner-Fairbank Research Center in McLean, Virginia.
An approach for the evaluation of moisture transport in porous media is introduced and demonstrated through measurement of capillary absorption and evaporative drying in cement mortar. The sensing In Situ Analysis of Moisture in Cement Based Materials | SpringerLinkAuthor: Masoud Ghandehari, Cristian S.
Vimer, Ioannis Ioannou, Alexey Sidelev, Peter Spellane. determination of moisture levels in structural concrete using pulsed nmr An investigation has been conducted of nuclear magnetic resonance (NMR) as the basis for nondestructively measuring moisture content in concrete.
NMR-measurements for determination of local moisture content of coated wood. Abstract. Local increased moisture content (MC) in wood constructions may result in different kinds of mechanical and, especially, biological degrading problems.
Therefore, it is of great importance to control the MC of the by: 6. Charlotte Held Gotfredsen received her degree in from Odense University, Denmark. She continued her graduate studies at Odense University with Dr. Jens Peter Jacobsen and Professor Jesper Wengel working on the synthesis and NMR structural studies of modified oligonucleotides and received her Ph.D.
degree in Chemistry in Deformation cracks are caused by concrete deformation due to foundation settlement and friction, thermal effects, temperature changes, drying shrinkage, autogenous shrinkage, and so on.
For this type of crack, the onset and enlargement of cracks needs an internal force accumulation and transmission procedure. The determination of maximum dry density and optimum moisture content of the soil is a measure of compaction level of soils.
This can be measured by mainly two methods Standard Proctor Compaction Test and Modified Proctor Compaction the tests help to determine the optimum moisture content that is required for soil to attain maximum compaction i.e Author: Neenu Arjun.
ii Abstract: Cement-treated base (CTB) is a mixed-in-place or central-plant-produced material consisting of soil/aggregate, cement, and water that creates a strong and durable stabilized roadway base. This guide to CTB discusses its applications, benefits, design, construction, testing, and Size: 2MB.
In-situ monitoring of the moisture content of a nineteenth century brick wall following the application of lime plaster showed expected changes in moisture content.
An increase in wall moisture content following the application of the plaster and the wall returned to its original moisture state by 9 months.
Method of Test for DETERMINING TOTAL MOISTURE AND FREE MOISTURE IN AGGREGATE (COARSE AND FINE) DOTD Designation: TR Method A – Rapid Drying I.
Scope A. This procedure is designed to determine the total moisture and free moisture contents of coarse and fine aggregates for Portland cement concrete by drying theFile Size: KB.
A coating may also reduce the drying rate of wood, but there is very limited work done on coated wood during desorption/drying by NMR . In situ determination of local moisture content for. at the nano-scale and of providing a macroscopic in-situ measurement of water distribution in concrete infrastructure.
With regard to pore water interactions in cement three topics are addressed. First it is shown that the exchange observed in 1H Nuclear Magnetic resonance (NMR) 2D T 2-T2 exchange. Concrete Moisture Profiler Nondestructive moisture profiling in concrete with a portable MRI sensor.
The sensor measures the volumetric water content in concrete directly from the MR signal amplitude. ABSOLUTE MEASUREMENT: The measurement is performed without requiring any physical contact with the Size: KB.
A single point NMR method for an instantaneous determination of the moisture content of wood Maks Merela1, Primozˇ Oven1, Igor Sersˇa2,* and Ursˇa Mikac2 1 Department of Wood Science and Technology, Biotechnical Faculty, University of Ljubljana, Ljubljana, Slovenia 2 Jozˇef Stefan Institute, Ljubljana, Slovenia *Corresponding author.
Structure determination using NMR Spectroscopy. Reserve List for Chem (Reich) Fall General Textbooks “Organic Structural Analysis,” P. Crews, J.
Rodriguez, M. Jaspars. guide for use of coal combustion by-products in structural fills: astm d /dm: test method for logging in situ moisture content and density of soil and rock by the nuclear method in horizontal, slanted, and vertical access tubes: astm a practice for installing factory-made corrugated steel pipe for sewers and other.
For in-situ inspection of concrete, there is generally a considerable pent-up demand in measuring non-mechanical quantities of building materials.
Special interest applies to methods characterizing the properties of moisture storage and transport, because water influences nearly all damage processes in concrete.
J.-P. Korb, School of FC NMR relaxometry, Mede, June 2 Annual consumption of concrete per inhabitant on earth (1 m3) 1Kg of CO2 for 1Kg of cement (clinker) at °C Annual consumption of concreteFile Size: 6MB. The American Concrete Institute (ACI) is a leading authority and resource worldwide for the development and distribution of consensus-based standards, technical resources, educational programs, certification programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
The magnitude of variations of in situ strength within structural members varies from one member to another in a random fashion. • With the height of a concrete lift, in situ strength decreases towards the top of a lift, even for slabs, and can be 25% less at the top than in the body of the concrete.
Soil Compaction Soil compaction is defined as the method of mechanically increasing the density of soil. In construction, this is a significant part of the building process. If performed improperly, settlement of the soil could occur and result in unnecessary maintenance costs or structure failure.
Almost all types of building sitesFile Size: 2MB. amount used to permanently stabilize the soil. The changes made to lime-modified soil may or may not be permanent. The main distinction between modification and stabilization is that generally no structural credit is accorded the lime-modified layer in pavement design.
Lime modification works best in clay soils. The Chemistry of Lime Treatment3. Determination of design parameters for rock should take into consideration the in-situ rock properties engineering properties of the underlying soil strata may also change. For example, normally consolidated Modified California rings.
Moisture content can provide the necessary data for calculating the dry unit. K constant is initially determined from NOE’s between protons at fixed distance log V log r log V = log K - n r r n K V where K is a constant and n can vary from 4 to 6.
Classes of constraints 1. Backbone 6 V = A/d 2. Sidechain V = B/d4 Size: 8MB. Proton (1H) and carbon (13C) NMR spectra for ethyl acetate, 4-methylpentanone, and 2-heptanone are obtained and analyzed using a JOEL MHz NMR.
Breanne McGee helped develop this experiment. Concrete cover for reinforcement measured from the outside face of the wall shall not be less than 1 1 / 2 inches (38 mm) for No. 5 bars and smaller, and not less than 2 inches (51 mm) for larger bars. Concrete shall have a specified compressive strength, f′ c, of not less than 2, psi ( MPa).
Organic structure determination using 2-D NMR spectroscopy / Jeffrey H. Simpson, p. Includes bibliographical references and index. ISBN (pbk.: alk. paper) 1. Molecular structure. Organic compounds—Analysis. Nuclear magnetic resonance spectroscopy. Title. QDS ’—dc22 File Size: 3MB.
moisture contents in excess of 14 percent. Roof trusses and rafters, on the other hand, may dry below 6 percent. Squeak-ing floors and loose nails in wallboard or siding can be reduced by allowing framing to season to a moisture con-tent which is as close as possible to moisture levels it will reach in service and by utilizing modern framing File Size: 1MB.
The American Concrete Institute. Founded in and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete.
Bio-NMR is a project financed by the European Commission Framework Programme 7 (FP7) that aims to further the structuring of the Biological NMR infrastructures, their user community and biological NMR research in Europe into a coherent research community prepared to tackle scientific and biomedical challenges of increasing complexity at the forefront of research.
Improvements in NMR instrumentation now mean that 2D NMR spectra are routinely (and sometimes automatically) acquired during the identification and characterisation of organic compounds. Organic Structures from 2D NMR Spectra is a carefully chosen set of more than 60 structural problems employing 2D-NMR by: 1.
NMR spectroscopy is an analytical technique used to determine the chemical molecular structure of a compound. NMR provides both quantitative and qualitative data on the composition of a sample.
This technique can be used for quality control, for research, to identify an unknown, or to determine the content and purity of a sample. Terence N. Mitchell Burkhard Costisella Universität Dortmund Universität Dortmund – Fachbereich Chemie – – Fachbereich Chemie – Dortmund Dortmund Germany Germany e-mail: e-mail: [email protected] [email protected] Preface Readers can obtain a list of answers to the problems by applicationFile Size: 5MB.
Standard Test Method for Determination of In Situ Stress in Rock Mass by Overcoring Method—Three Component Borehole Deformation Gauge: D - Standard Test Method for Slake Durability of Shales and Other Similar Weak Rocks: D - Standard Test Method for In Situ Stress and Modulus of Deformation Using the Flat Jack Method: D - Hansen, K.K., S.K.
Jensen, L. Gerward, and K. Singh,“Dual-Energy X-ray Absorptiometry for the Simultaneous Determination of Density and Moisture Content in Porous Structural Materials,” Proceedings of the 5th Symposium on Building Physics in the Nordic Countries, Gothenburg, Sweden, pp.
–, Chalmers Tekniska Högskola Cited by: 4. Exam 1. Chemistry Febru Do not open or begin this exam until instructed.
This exam consists of 5 pages plus the cover page and one blank page for scratch work. Before starting the exam, check to make sure that you have all of the pages. The exam has a total of points and includes 16 questions. Polymerization-induced self-assembly (PISA) is a powerful platform technology for the rational and efficient synthesis of a wide range of block copolymer nano-objects (e.g., spheres, worms or vesicles) in various media.
In situ small-angle X-ray scattering (SAXS) studies of reversible addition–fragmentation chain transfer (RAFT) dispersion polymerization have previously Cited by: 4. The surface of the floor should be cleaned by scraping, brushing, vacuuming, or any other method.
All concrete slabs should be tested for moisture regardless of age or grade level while all concrete floors should be tested for pH before installing resilient flooring. This abstract is a brief summary of the referenced standard. It is the ratio of force per unit area required to penetrate a soil mass with standard circular piston at the rate of mm/min.
to that required for the corresponding penetration of a standard material. The California Bearing Ratio Test (CBR Test) is a penetration test developed by California State Highway Department (U.S.A.) for evaluating the bearing capacity of subgrade.
Soil Properties & Soil Compaction Page (6) Solved Problems in Soil Mechanics Ahmed S. Al-Agha 3. (Mid ): An earth dam require one hundred cubic meter of soil compacted with unit weight of KN/m3 and moisture content of 8%, choose two from the three borrow pits given in the table below, knowing that the first must be one of the two borrow pits, the specific gravity .NMR Sensitivity to °oor vibration Y.
Ben-Dov a, R. Kappel b, P. Heiland a and S. Rajan c a IDE, 68 Mazzeo Drive, Randolph, MAUSA b Integrated Dynamics Engineering GmbH, Karl-Liebknecht Str. 30, D Raunheim, Germany c Novartis Institutes for BioMedical Research, Massachusetts Avenue, Building # Room # 6C, Cambridge, MAUSA .buy bs (): in-situ floorings - code of practice for concrete bases and screeds to receive in-situ floorings from sai global.