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Abstract  

Sulphate resistance and passivation ability of the mortars made from pozzolan cement of CEM IV/A (P) type according to European Standard EN 197-1 (zeolite blended cement with 60.82 mass% of PC clinker, 35.09 mass% of zeolite and 4.09 mass% of gypsum abbreviated as ZBC) and ordinary Portland cement (abbreviated as PC) are introduced. Resistance tests were performed in water and 5% sodium sulphate solution (both 20°C) for 720 days. The increased sulphate resistance of pozzolan cement relative to that of PC was found. The key quantitative insight into the hydrate phase behaviour is given by thermal analysis. This is due to pozzolanic reaction of zeolite with PC resulting in reduction of the formed Ca(OH)2 opposite to the reference PC. Ability of pozzolan cements with 15 to 50 mass% of zeolite to protect steel against corrosion was verified in 20°C/85% RH-wet air within 180-day cure. Steel was not corroded in the mortars made with pozzolan cement containing up to 35 mass% of zeolite. Pozzolan cement of CEM IV/A (P) type containing 35 mass% of zeolite is a suitable cementitious material for concrete structures exposed to sulphate attack. Steel is protected against corrosion by this pozzolan cement in the same measure as the reference PC.

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degree can be more easily determined and is calculated as the heat released at a certain moment Q ( t ) relative to the maximum heat release Q max [ 14 ]. Pane and Hansen [ 21 ] also affirmed the suitability of the method for blended cements. Moreover

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-5533.0000083 . 4. Tongsheng Z , Qijun Y , Jiangxiong W , Peng G , Pingping Z . Study on optimization of hydration process of blended cement . J Therm Anal Calorim . doi: 10.1007/s10973

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blended cements, impart similar behaviour to that of commercial metakaolin especially with respect to cement strength development, setting times and hydration as well as durability [ 32 ]. The similar kaolins with relatively poor kaolinite content are in

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Journal of Thermal Analysis and Calorimetry
Authors: Carolina Resmini Melo, Elidio Angioletto, Humberto Gracher Riella, Michael Peterson, Márcio Roberto Rocha, Aline Resmini Melo, Luciano Silva, and Susane Strugale

.02.009 . 11. Frías M , Rodrígues O , Vegas I , Vigil R . Properties of calcined clay waste and its influence on Blended cement . J Am Ceram Soc. 2008 . doi: 10.1111/j.1551-2916.2008.02289.x

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granulated blast-furnace slag on some properties of pastes, mortars, and concretes Frohnsdorff , G , eds. Blended cements, ASTM STP 897 . Philadelphia : American Society for Testing and Materials ; 1986 29 – 47 . 10.1520/STP36390S

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, Perraki , T , Tsivilis , S , Kakali , G . Zeolite blended cements: evaluation of their hydration rate by means of thermal analysis . J Therm Anal Calorim . 2009 ; 96 : 993 – 998 . 10.1007/s10973-009-0056-x . 9

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157 – 164 10.1016/0008-8846(80)90072-1 . 8. Morsy , SM , Shebl , SS 2007 Effect of silica fume and metakaoline pozzolana on the performance of blended cement pastes against fire

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. Evju , C , Hansen , S . 2005 . The kinetics of ettringite formation and dilatation in a blended cement with beta-hemihydrate and anhydrite as calcium sulfate . Cem Concr Res . 35 12 2310 – 2321 10.1016/j.cemconres.2004

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, E , Perraki , T , Tsivilis , S , Kakali , G 2009 Zeolite blended cements: evaluation of their hydration rate by means of thermal analysis . J Therm Anal Calorim 96 : 993 – 998 10.1007/s10973-009-0056-x

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