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 file ready by means of the RILEM TC “Application of great Absorbent Polymers (SAP) in concrete construction”. It offers a complete evaluation 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. moreover, the foremost benefits 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 exploit SAP instead to air-entrainment brokers which will bring up the frost resistance of concrete, and eventually, the advantage of guidance the rheology of clean cement-based fabrics. the ultimate bankruptcy describes the 1st current and diverse potential functions for this new concrete additive.

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Additional info 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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The absorption of the particle was about 12 g pore solution per g of SAP. The absorption process took about 3 hours, even if about 90% had taken place at 35 minutes after casting, when the first tomography was completed [20]. An alternative technique to study water absorption by SAP in fresh concrete is NMR relaxation. NMR experiments with high time resolution indicate a fast water uptake of SAP, within less than 5 min after water addition [21]. 1 Desorption Driving forces of desorption When the cement paste self-desiccates due to hydration, a gradient in water activity is generated within the concrete between the water in the SAP and the pore fluid [22].

However, in many instances it has been observed that empirical tests are performed in order to obtain properties that can be associated with the rheological constants described above. For example, when testing Self-Compacting Concrete (SCC), the slump flow diameter, a parameter that describe the concrete flowability, is linked to the yield stress of fresh concrete whereas the flow-out time in the so-called V-funnel test is often correlated with the plastic viscosity of SCC. The aim of the present chapter is to compile the results available on the literature about the workability of concrete and mortar containing SAP.

Mönnig [2] measured the desorption rate of SAP particles by monitoring the mass loss at different RH of layers of saturated SAP particles with a thickness of one particle; the SAP were saturated by spraying. This approach was necessary to avoid the complications arising with multiple SAP layers, where the results would 28 P. Lura et al. 00 0 500 1000 1500 2000 2500 Time (min) Fig. 4 Desorption measurements of SAP (thick, full lines) and plain water (thin, dashed lines) exposed to different RH levels at 20°C.

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