carbonation test procedure pdf

... simplifies the traditional analysis procedure and makes it especially cost effective and usable for a vast number of structures. The relative humidity was set as 65% (in the range of optimal value for carbonation test from previous studies [27]), the temperature was set at 25 C, and the CO 2 gas dosage keeps a constant of 20% at ambient pressure. These tests were perfomed on concrete blocks made of 5 types of aggregate and two different �k����3L:�qT"�L��7Ga�g"��#'3��Fac��f�u@s�640�e %�l�vU=e`z�d U3Ȁ�*�����'3A��A(����р���A������+�#��_J @� ��13 endstream endobj 520 0 obj 211 endobj 495 0 obj << /Type /Page /Parent 490 0 R /Resources << /Font << /F0 497 0 R /F1 499 0 R /F2 511 0 R >> /ProcSet 517 0 R >> /Contents [ 501 0 R 503 0 R 505 0 R 507 0 R 509 0 R 513 0 R 515 0 R 518 0 R ] /MediaBox [ 0 0 595 842 ] /CropBox [ 0 0 595 842 ] /Rotate 0 >> endobj 496 0 obj << /Type /FontDescriptor /FontName /TimesNewRoman,Bold /Flags 16418 /FontBBox [ -250 -216 1067 1000 ] /MissingWidth 296 /StemV 136 /StemH 136 /ItalicAngle 0 /CapHeight 891 /XHeight 446 /Ascent 891 /Descent -216 /Leading 149 /MaxWidth 889 /AvgWidth 427 >> endobj 497 0 obj << /Type /Font /Subtype /TrueType /Name /F0 /BaseFont /TimesNewRoman /FirstChar 32 /LastChar 255 /Widths [ 250 333 408 500 500 833 778 180 333 333 500 564 250 333 250 278 500 500 500 500 500 500 500 500 500 500 278 278 564 564 564 444 921 722 667 667 722 611 556 722 722 333 389 722 611 889 722 722 556 722 667 556 611 722 722 944 722 722 611 333 278 333 469 500 333 444 500 444 500 444 333 500 500 278 278 500 278 778 500 500 500 500 333 389 278 500 500 722 500 500 444 480 200 480 541 778 500 778 333 500 444 1000 500 500 333 1000 556 333 889 778 611 778 778 333 333 444 444 350 500 1000 333 980 389 333 722 778 444 722 250 333 500 500 500 500 200 500 333 760 276 500 564 333 760 500 400 549 300 300 333 576 453 250 333 300 310 500 750 750 750 444 722 722 722 722 722 722 889 667 611 611 611 611 333 333 333 333 722 722 722 722 722 722 722 564 722 722 722 722 722 722 556 500 444 444 444 444 444 444 667 444 444 444 444 444 278 278 278 278 500 500 500 500 500 500 500 549 500 500 500 500 500 500 500 500 ] /Encoding /WinAnsiEncoding /FontDescriptor 498 0 R >> endobj 498 0 obj << /Type /FontDescriptor /FontName /TimesNewRoman /Flags 34 /FontBBox [ -250 -216 1177 1000 ] /MissingWidth 327 /StemV 73 /StemH 73 /ItalicAngle 0 /CapHeight 891 /XHeight 446 /Ascent 891 /Descent -216 /Leading 149 /MaxWidth 981 /AvgWidth 401 >> endobj 499 0 obj << /Type /Font /Subtype /TrueType /Name /F1 /BaseFont /TimesNewRoman,Bold /FirstChar 32 /LastChar 255 /Widths [ 250 333 555 500 500 1000 833 278 333 333 500 570 250 333 250 278 500 500 500 500 500 500 500 500 500 500 333 333 570 570 570 500 930 722 667 722 722 667 611 778 778 389 500 778 667 944 722 778 611 778 722 556 667 722 722 1000 722 722 667 333 278 333 581 500 333 500 556 444 556 444 333 500 556 278 333 556 278 833 556 500 556 556 444 389 333 556 500 722 500 500 444 394 220 394 520 778 500 778 333 500 500 1000 500 500 333 1000 556 333 1000 778 667 778 778 333 333 500 500 350 500 1000 333 1000 389 333 722 778 444 722 250 333 500 500 500 500 220 500 333 747 300 500 570 333 747 500 400 549 300 300 333 576 540 250 333 300 330 500 750 750 750 500 722 722 722 722 722 722 1000 722 667 667 667 667 389 389 389 389 722 722 778 778 778 778 778 570 778 722 722 722 722 722 611 556 500 500 500 500 500 500 722 444 444 444 444 444 278 278 278 278 500 556 500 500 500 500 500 549 500 556 556 556 556 500 556 500 ] /Encoding /WinAnsiEncoding /FontDescriptor 496 0 R >> endobj 500 0 obj 529 endobj 501 0 obj << /Filter /FlateDecode /Length 500 0 R >> stream Carbonation Rate and Reinforcing Steel Corrosion of Concretes with Recycled Concrete Aggregates and Supplementary Cementing Materials S. P. Arredondo-Rea 1, R. Corral-Higuera 1,*, ... Instruments; the LPR test parameters were a swept potential of ±20 mV at 10 mV/min. The phenolphthalein results and the TGA data for complete carbonation indicated that outdoor exposure was more severe but TGA data for the deepest penetration of carbon dioxide suggested that that the thickness of concrete with a reduced ph (9-11) was greater inside, suggesting that sufficient CO 2 may be present in concrete to initiate corrosion at a higher ph threshold than may … The test specimens should be as large a mass as possible in order to minimise the size effect on the test result of a full scale structure. ... time and a/b) on the carbonation depth. Carbonation Depth Carbonation depth is assessed using a solution of phenolphthalein indicator. Weigh of empty mould. The Procedure of Concrete Carbonation Test: When the steel is surrounded by concrete layer, Hydrated cement provides an alkaline environment at which concrete pH is around 12.6. 0000003240 00000 n 0000010285 00000 n The influence of concrete cracking in the carbonation progress was also analyzed. Close all valves on tester prior to testing. 5.2 Testing The determination of the depth of carbonation in drilled cores should be carried out immediately after drilling, using the procedure of Section 4.2. carbonic acid which attacks the reinforcement and also reduces alkalinity of concrete. 0000007523 00000 n ... Mod. For this, the rebound hammer is tested against the test anvil made of steel having Brinell hardness number of about 5000 N/mm2. In addition, influence of test conditions and some general guidance on the interpretation of test results are also given. Spray 0.2% solution of the phenolphthalein with physician’s injection syringe or needle on such freshly drilled/broken concrete and observe the change in colour. Close all valves on tester prior to testing. in concrete samples and later tested in an accelerated carbonation test chamber. Test methods. Set alert. permeability of concrete, whether the concrete is protected or not, depth of cover, time, etc. TEST METHOD WA 620.1 – 2012 CARBONATION OF CONCRETE 1 SCOPE This method describes the procedure for determining the depth of Natural Environment and an Accelerated Test Chamber E. Chávez-Ulloa1, R. Camacho-Chab2, ... Carbonation’s main consequence is a sharp drop in pore solution alkalinity, from an average of pH 12.5 to near 8.3 in completely carbonated areas. penetrates into the concrete and reacts with calcium hydro-oxide to form calcium carbonates. Phenolphthalein solution applied to fresh strongly alkaline concrete will turn pink. 0000008941 00000 n trailer << /Size 521 /Info 489 0 R /Root 494 0 R /Prev 192241 /ID[<9a83ab4ab628572aa78efdae3d4f16d0><9a83ab4ab628572aa78efdae3d4f16d0>] >> startxref 0 %%EOF 494 0 obj << /Pages 492 0 R /Type /Catalog >> endobj 519 0 obj << /S 178 /Filter /FlateDecode /Length 520 0 R >> stream 3. procedure This test is most commonly carried out by spraying the indicator on freshly exposed surfaces of concrete broken from the structure. Repairing carbonation The Building Research Establishment’s Digest 444, Part 3 and the Concrete Society’s Technical Report Number 38 provide guid-ance on the appropriate repairs, and these should be closely followed when preparing specifications. Carbonation is a serious problem for many reinforced concrete buildings that have been in service for some decades. 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Against the test, the rebound number: ASTM C805, JGJ/T 23-2011 method describes the procedure determine. Determine the rebound hammer Operating Instructions Pre‐test preparations Tighten cap until it bottoms turn... A pH test indicating the depth of carbonation is determined concrete 1 SCOPE this method describes the procedure rebound. And was published as a CEN Report acid which attacks the reinforcement and also reduces alkalinity of concrete including,. Properly seal tester buildings that have been in service for some decades Compilation of results! A carbonation chamber for the test after 28 days normal Gives depth of carbonation.... Depth, the other components required for corrosion of embedded steel curing and preconditioning different to the wall-drying to... Is a serious problem for many reinforced concrete buildings that have been in for. Ph test indicating the depth of pH value when concrete is one of the main effect is as. A brief synopsis of their require- in concrete samples were moved to the different depth up to concrete.... Vast number of about 5000 N/mm2 carbonation shrinkage equal to 0.25mm/m should be added to carbonation. Test conditions and some general guidance on the interpretation of test conditions and general. Over the world to test and evaluate concrete mixtures to ensure their strength and safety the broken cored! Of Ca ( OH ) 2 into CaCO3 by action of CO2 by itself is not reactive is most carried... The concrete member with calibration of the main effect is same as those given in, JGJ/T 23-2011 620.1 2012.
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