Web1 day ago · According to the standard of the test method for long-term performance and durability of ordinary concrete (i.e. GB/T50082-2009), a 1% concentration of phenolphthalein alcohol solution was prepared for the phenolphthalein titration observation. Phenolphthalein's pH sensitivity is exploited in other applications: concrete has naturally high pH due to the calcium hydroxide formed when Portland cement reacts with water. As the concrete reacts with carbon dioxide in the atmosphere, pH decreases to 8.5-9. See more Phenolphthalein is a chemical compound with the formula C20H14O4 and is often written as "HIn", "HPh", "phph" or simply "Ph" in shorthand notation. Phenolphthalein is often used as an indicator in See more Phenolphthalein can be synthesized by condensation of phthalic anhydride with two equivalents of phenol under acidic conditions. It was … See more • Page on different titration indicators, including phenolphthalein See more pH indicator Phenolphthalein's common use is as an indicator in acid-base titrations. It also serves as a … See more • Bromothymol blue • Litmus • Methyl orange • pH indicator • Universal indicator See more
Concrete Lab - Illinois Department of Transportation
WebCarbonation depth is assessed using a solution of phenolphthalein indicator that appears pink in contact with alkaline concrete with pH values in excess of 9 and colourless at lower levels of pH. The test is most commonly carried out by spraying the indicator on freshly exposed surfaces of concrete broken from the structure or on split cores. Webphenolphthalein method according to BS EN 1463018 on the cores removed. Phenolphthalein is a colored pH indicator whose turn is around 9. Phenolphthalein turns non–carbonated concrete red, and remains colourless in carbonated concrete. The principle of the test consists in: 1. Slit the carrots along their longitudinal axis (if possible at mid– organic growth or growth through acquisition
American Concrete Institute
WebDec 12, 2014 · Phenolphthalein indicator has traditionally been used to determine the depth of carbonation in concrete. This investigation uses the thermalgravimetric analysis (TGA) method, which tests the ... Webnice to see the support of the concrete industry there to assist with all the extensive testing. Testing for each batch consist-ed of: u 3 cylinders for each day - 1, 3, 5, 7, 14, 28, and 56 … WebNov 1, 2024 · By dissolving 1% by mass of the phenolphthalein powder in ethanol, a pH indicator is prepared for the carbonation tests [5]. Carbonation depth can be indicated by spraying phenolphthalein indicator directly into the interior of concrete exposed by splitting (laboratory [7]) or drilling (field [8,9]). how to use fake blood