Influência do uso de adição de fíler cerâmico no controle de segregação e exsudação de concretos auto adensáveis

Abstract

Since its development in Japan in the mid-1980s, self-compacting concrete have been getting more space in the global construction market. However, although it has obvious advantages when compared to conventional concrete, requires obtaining greater control of the steps, since, as it is a superfluid concrete tends to present negatives effects of the segregation of aggregates and oozing water kneading when not properly dosed. Such phenomena are corrected by adding of thin in the mixture, for example, the cement and the limestone filler. Both growth of the consumer market of self compacting concrete, there was also an increase with respect to environmental issues involving the entire construction industry. In this regard, if the flags-ups of waste recycling, and seek by increasingly effective deployments in branch recycled materials, such as aggregates from construction and demolition waste. However, when we touch on issues related to the physical properties of these materials, a strong trend is that its use is limited to applications requiring greater control of characterization, since recycled aggregates tend to be highly porous and high exchange powdery material attached to its particles, from the beneficiation processes thereof. Thus, this study verifies the influence of the use of ceramic fillers produced upon production of recycled aggregates in the form of addition for self-compacting concrete, becoming a main control agent of segregation and exudation of these materials. Finally, it is evident that compared to limestone fillers usually employed for this purpose, the final product does not lose compressive strength or in early ages, even in late ages of cure, besides also presenting a significant consumption below the limestone fillers. It is further evidenced a similar response for absorption in relation to the concrete with use of limestone fillers, when subjected to contact with water for short periods, and recommendations that when subjected to longer periods of contact, adhere to greater care as to waterproofing.