Study of the autogenous shrinkage in microconcretes containing superabsorbent polymer and nano-silica

Author(s): Thyala A Cunha; Paulo Francinete; Livia B Agostinho; Eugênia F Silva; Anne N Lopes
Paper category: Proceedings
Book title: Proceedings of the 2nd International RILEM/COST Conference on Early Age Cracking and Serviceability in Cement-based Materials and Structures Volume 1
Editor(s): Stéphanie Staquet and Dimitrios Aggelis
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 251-256
Total Pages: 6
Language : English

Abstract: Autogenous shrinkage is a phenomenon that affects the High Performance Concrete (HPC), mainly due to its refined microstructure and low w/c ratio. This is closely associated to the hydration process, not depending on any external interference. The internal curing with Superabsorbent Polymer (SAP) is reported as the most effective mitigating strategy, whereas that it provides the necessary water for hydration, preventing the appearance of tensile stresses. However, the use of SAP increases the porosity of the concrete, leaves unconnected voids inside, which reduces mechanical strength. In this work the Nano-silica (NS) was used to compensate this decrease. Nine mixtures with different amounts were produced. The results indicate that SAP was efficient for the mitigation of autogenous shrinkage (reduction of 84% for SAP03), while the addition of NS increases this (10% increases for NS2). The mixture containing SAP and NS was very promising, since the beneficial action of SAP was not impaired by the presence of NS.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00

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