Influência do tipo de fibra PVA nas propriedades de um compósito cimentício engenheirado

Abstract

This study aims to analyze the combined use of two types of PVA fibers (REC15 and RF400) on the properties of engineered cementitious composite (ECC). To achieve this, four ECC mixtures were prepared: one reference mixture with 100% REC15 fiber and three others with 25%, 50%, and 100% replacement of REC15 fiber by RF400, keeping the total fiber content at 2% of the total solid volume. The ECC matrix formulation was based on the proposal by Li (2008), maintaining constant cement and fly ash consumption, water/solid ratio, and superplasticizer content. Tests were conducted to determine the consistency index, bulk density, and incorporated air content in the fresh state. After 56 days of curing, the flexural tensile strength was measured using both three-point and four-point bending tests. The results showed that REC15 fiber had a significant impact on the workability and mechanical properties of the ECC. It was observed that increasing the REC15 fiber content led to reduced fluidity but improved the mechanical strength of the ECC.