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Download Application of Super Absorbent Polymers (SAP) in Concrete by Viktor Mechtcherine (auth.), Viktor Mechtcherine, Hans-Wolf PDF

By Viktor Mechtcherine (auth.), Viktor Mechtcherine, Hans-Wolf Reinhardt (eds.)

This is the state of the art document ready through the RILEM TC “Application of tremendous Absorbent Polymers (SAP) in concrete construction”. It supplies a complete assessment of the homes of SAP, particular water absorption and desorption behaviour of SAP in clean and hardening concrete, results of the SAP addition on rheological houses of unpolluted concrete, alterations of cement paste microstructure and mechanical homes of concrete. moreover, the most important merits of utilizing SAP are defined intimately: the power of this fabric to behave as an inner curing agent to mitigate autogenous shrinkage of high-performance concrete, the chance to take advantage of SAP in its place to air-entrainment brokers to be able to bring up the frost resistance of concrete, and eventually, the good thing about steerage the rheology of clean cement-based fabrics. the ultimate bankruptcy describes the 1st latest and diverse potential functions for this new concrete additive.

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Extra resources for Application of Super Absorbent Polymers (SAP) in Concrete Construction: State-of-the-Art Report Prepared by Technical Committee 225-SAP

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This approach was followed by Jensen [14], who prepared plane polished cross sections of water-entrained cement mortars with fluorescent paste and examined them by optical microscope. Both the amount of SAP and their distribution could be retrieved with this method. Similarly, Pieper [7] used a high resolution scanner to collect the digital images from a polished paste surface to quantify inclusion fraction. In addition, the particle size distribution of the dry SAP was obtained by image analysis of SEM pictures.

The kinetics of water transport in cement pastes have been addressed by a number of techniques. The common understanding is that the absorption of pore solution in the SAP is rapid and takes place in the first minutes after mixing. The water release from the SAP starts after setting time and appears to be completed after a couple of days, depending on the cement paste and on the curing temperature. In the opinion of the authors, NMR-based techniques, synchrotron X-ray tomography and neutron tomography seem to be very promising techniques to further clarify the mechanisms and the kinetics of water release in cement pastes and the distance to which internal curing water may travel.

RILEM Conf. on Use of Superabsorbent Polymers and Other New Additives in Concrete, 15-18 August 2010, Technical University of Denmark, Lyngby, Denmark [5] Lothenbach B, Winnefeld F (2006). Thermodynamic modelling of the hydration of Portland cement. Cem Concr Res 36(2): 209–226 [6] Lura P, Lothenbach B (2010) Influence of pore solution chemistry on shrinkage of cement paste. The 50-year Teaching and Research Anniversary of Prof. Sun Wei on Advances in Civil Engineering Materials. C. Miao, G. Ye and H.

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