Abstract

SILVA URREGO, YIMMY FERNANDO  and  DELVASTO ARJONA, SILVIO. Influence of masonry residue on the resistance of self-compacting concrete to the sodium sulfate attack. Rev.EIA.Esc.Ing.Antioq [online]. 2020, vol.17, n.33, pp.168-181. ISSN 1794-1237.  https://doi.org/10.24050/reia.v17i33.1361.

In this paper are shown the results of an experimental study of self compacting concretes with residue of masonry about their resistance to external sulfate attack, they presented a constant content of water of 202,5 kg/m3 and different volumes of RM (0%, 25% Y 50%) as a partial replacement of Portland cement (OPC) exposed to a sulfate sodium solution at 5%. The properties in fresh state as fluidity, passing ability and resistance to segregation were evaluated through slump flow, V-funnel and L-box. In hard state, the compression strength and expansion were determinate. Besides, techniques of X-ray diffraction (XRD), scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) were applied to pastes in order to investigate the effects of sulfates on the microstructure. The results showed that all mixes have the properties on fresh state. Also, it was found that when CACs are exposed in a sodium sulfate solution, the RM can improve the resistance of CACs to the sulfates attack comparing with CAC only of OPC.

Keywords : Residue of masonry; Self-compacting concrete; Sulfates; Expansion; Ettringite.

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