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Internal coatings stress (ICS) develops in coatings applied to a rigid substrates. During drying, volume changes due to solvent loss and/or cure induces stresses in the films. Differences in the thermal expansion coefficients of the coating and substrate also affect the ICS. ICS affects the interfacial adhesion and results in delamination once the stress exceeds the force of adhesion.
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LIBS is a type of optical emission spectroscopy used to measure elemental concentrations in a material. LIBS operates by using a pulsed, focused laser that is fired at a sample with sufficient pulse energy as to create a plasma around the area struck. Bound atomic electrons are stripped from the atoms comprising the material. As the plasma cools, atoms recombine with electrons and in the process emit light in the UV, optical and IR regimes.
Field pH testing on vertical concrete prior to application of high-performance protective linings is primarily required to confirm the removal of deleterious substances following surface preparation. This paper explores the use of various in situ testing techniques for measuring surface pH on vertical concrete.
Real energy savings data for residential buildings is scarce and difficult to find. To address this concern, two identical houses were built in the outskirts of Monterrey, Mexico, where summer temperatures are usually very high (˜113°F). Energy consumptions using different waterproof coatings with different values of solar reflectance were evaluated.
A test methodology is shown for field application of electrochemical impedance spectroscopy (EIS). The method utilizes low-cost, accessible materials to secure a temporary solution cell to the infrastructure’s coated surface. A laptop computer provides the power source and operating system for the mobile potentiostat during EIS data collection. This data provides a quantitative measure of the coating condition. The objective of this work is to incorporate EIS testing into standard coatings inspection to estimate remaining service life for the intact coating, which improves coatings maintenance planning for facility owners.
A century ago, automotive companies developed the laboratory salt spray corrosion test method standardized in ASTM B117. Even then they knew this quality control test did not produce realistic exposures. Wet-dry cyclic tests provided modest improvements in correlation and have been used in architectural applications for many years.
The moisture assessment was determined by using a combination of 4 different methods rather than using one single method. On previous projects, the consultants had experience with the inaccuracy of some of the methods.
Moisture testing of concrete substrates has become a common practice in the floor coatings industry. Even though most contractors and field technicians are capable of performing the testing, they don’t really understand what the data they are collecting means, other than the acceptance criteria established by the product manufacturer of the coating or flooring being installed.
The importance of moisture testing of concrete floors cannot be stressed enough. Moisture is a leading cause of coatings failures on concrete floors. There are many ways moisture can affect floor coatings on concrete. Moisture testing alone is not sufficient enough at detecting all of the potential problems. Inspecting a building prior to performing any tests will provide a much clearer picture of the potential problems moisture in both liquid and vapor form can pose.
Corrosion inhibitors to provide protection of sucker-rod threads and box cavities against corrosive well fluids and to protect the threads from galling. Inhibited lubricants and tests to select.
Some 325 tables, graphs, and charts. Conversion Tables. Physical & Chemical Data. Corrosion Testing, Atmospheric, Seawater, Cathodic Protection, Protective Coatings. Standards. Organizations. Acronyms. 4th edition 2016 NACE E-BOOK