WebOct 9, 2015 · However, concrete made with blended cements exhibited higher depth of carbonation than the Portland cement concrete, except the Portland-fly ash cement with 14.3% of calcareous fly ash. The thin sections analysis confirmed the values of the carbonation depth obtained from the phenolphthalein test. WebThe origins of phenolphthalein lie in the German chemical industry during the heyday of artificial dye discovery in the late 19 th century. An organic molecule made of only carbon, hydrogen and oxygen, it was first synthesised in 1871 by Adolf von Baeyer, who combined phenol and phthalic anhydride in the presence of sulfuric acid or zinc chloride – the same …
Concrete Inspection and Testing Methods - HausBots
WebThe research of carbonation of existing concrete structures presented in the article was executed in the process of conducting a technical survey of the building. According to the results of the study, places with varying degrees of carbonation were identified. A method for preparing the phenolphthalein solution used in the examination is described. WebPhenolphthalein solution having 1% phenolphthalein is spray in the newly exposed concrete. If the colour of the concrete change to pink, that area of the concrete is not carbonated. … twitter mikel arriola
Concrete Carbonation Testing - Hammond Concrete Services
WebSep 1, 2006 · 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 concentration distribution of Ca (OH) 2 and CaCO 3, while the X-ray diffraction analysis (XRDA) tests the intensity distribution of Ca (OH) 2 and CaCO 3. WebApr 22, 2010 · Carbonation decreases the pH of the concrete and breaks the passivity of reinforcing steel. Therefore, carbonation is related to potential rebar corrosion even though carbonation itself does not directly damage the integrity of the concrete. ... It was found from the results that thymolphthalein was the best substitute for phenolphthalein, and ... WebPhenolphthalein comes in powder form, and will need to be dissolved in alco-hol for use in this test. In order to undertake the test, a section of ... ened concrete by the phenolphthalein method’. Repairing carbonation The Building Research Establishment’s Digest 444, Part 3 and the Concrete Society’s ... twitter mikey mccollor