Aditivo incorporador de ar para concreto celular: formulação e influência no produto final

Abstract

More viable alternatives fo r concrete technology are being increasingly debated in the academic field, especially to meet the current research needs of the economically feasible and logistically viable construction industry. Cellular conrete emerges as one of these technologies, accompanied by t he development of additives and aggregates. This work focuses on investigating the formulation of an air entraining additive and its influence on the final product, cellular concrete. The additive is introduced in the form of foam , giving the concrete the name of foamed cellular concrete (FCC). Hydrogen peroxide (H2O2) as an aerating agent in an alkaline medium was combined with an anionic surfactant, cement, and sand in different proportions to ach ieve a stable formula. The pro gre ssive steps of t he product ion process are presented, and the functional characteristics of the materials were studied and compared with the standards established by the current Brazilian regulations (according to ABNT) and the literature. A new FCC was dev eloped and s tudi ed through physical chemical and mechanical analyses. At the end of the study, a FCC with an apparent density of 43 kg/m3 and a compressive strength of 14.74 MPa was obtained. In the manufacturing process, a superplasticizer additive bas ed on polycarboxylate was als o used, which not only acted as a water reducing agent in the mix (reducing water content by approximately 9%) but also helped increase the cellular concrete's strength by 10.8% compared to concret e without the additive.