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 record ready via the RILEM TC “Application of tremendous Absorbent Polymers (SAP) in concrete construction”. It provides a entire evaluate of the houses of SAP, particular water absorption and desorption behaviour of SAP in clean and hardening concrete, results of the SAP addition on rheological homes of unpolluted concrete, alterations of cement paste microstructure and mechanical houses of concrete. in addition, the most important merits of utilizing SAP are defined intimately: the facility of this fabric to behave as an inner curing agent to mitigate autogenous shrinkage of high-performance concrete, the prospect to exploit SAP in its place to air-entrainment brokers with the intention to raise the frost resistance of concrete, and at last, the good thing about guidance the rheology of clean cement-based fabrics. the ultimate bankruptcy describes the 1st latest and diverse potential purposes for this new concrete additive.

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

Sample text

Part of this gradient of water activity is established by the capillary pressure developing in the pore fluid as a consequence of emptying of the pores due to hydration or external drying [23,24]. An additional contribution may be osmotic pressure, due to the fact that the composition of the pore solution in the cement paste at setting time and later may be different from that of the solution absorbed in the SAP. The process of desorption of the SAP may be described as a competition for water between the SAP and the cement paste [2].

This change in the w/c will cause an increase in the yield stress and in the plastic viscosity of concrete. In 5 Effect of SAP on the Workability of Concrete and Mortar 41 Fig. 1 Slump Flow test on fresh UHPC [5] addition to this pure water binding effect, it is believed that a further increase in the yield stress and plastic viscosity will be caused by the physical presence of the swollen SAP particles [4]. At present, only few results are available in the literature regarding the influence of SAP on the workability of concrete.

More details on the SAP can be found in Chapter 3. In addition to parameters depending on the SAP architecture, the ionic strength of the aqueous solution is of special importance for the swelling of the SAP. The ions in the solution change the inter- and intramolecular interactions of the polyelectrolytes due to shielding of charges on the polymer chain [1]. Especially the Ca2+ ions present in the pore solution of concrete can cause additional interlinking of the polymer chains and limit their swelling [2].

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