Influência do polímero superabsorvente em argamassas autoadensáveis para empreendimentos hidráulicos

Abstract

Self-compacting concrete (SCC) is an innovative type of concrete that does not require vibration for compaction, being considered in the field of civil construction one of the great innovations of the sector in the last decades. In large concrete works, such as dams and hydroelectric plants, one of the problems is in the control of thermal cracking, due to the heat of hydration that originates mainly during the concrete curing process. Among the alternatives to mitigate pathological manifestations are superabsorbent polymers (SAP) that show promise in the field of engineering when added to cementitious composites. This work aims to analyze the addition of SAP as an internal curing element in self-compacting mortars (AAA), as well as its mechanical and thermal characteristics, in order to obtain an ideal proportion of the materials, so that it serves as a basis for execution. of self-compacting concrete, with a focus on structures with large volumes. In addition, this work presents a bibliometric analysis in the Scopus and Web of Science databases on the same topic, in order to facilitate the location of relevant studies for future research in this area. In this analysis, data on the number of publications, main authors and journals, most used keywords and countries that publish the most were obtained, in addition to bibliographic coupling and co-citation analyses. In the experimental program, laboratory tests were performed with AAAs with 0; 0.1 and 0.2% addition of SAP for both CPII-E-32 and CPV ARI and part of the samples underwent a submerged cure, while another part underwent a dry cure. Among the results obtained in the laboratory, the reduction of temperature variation of the traces with the addition of SAP stands out, where it is possible to assume a possible way of mitigating the temperature peaks in concrete pieces with large volumes. On the other hand, the compression and traction tests indicated loss of strength of the mortars, with the exception of the traction test carried out for CPII-E-32, where an increase in strength was obtained with the incorporation of SAP in the mixture.