This paper presents the experimental investigation to evaluate the flexural performance of newly developed hybrid Engineered Cementitious Composite (ECC) layer at tension zone around the main reinforcement of beam. Four different ECC mixes are used in the beam to evaluate the flexural performance, hybrid ECC based on the low modulus poly vinyl alcohol (PVA) and high modulus steel short random fibre reinforcement. The aim of hybridation is to improve the flexural, energy absorption and ductility performance of reinforced concrete beams. In addition to the compressive strength, young’s modulus, uniaxial tensile strength and bond strength of ECC mixes are determined. ECC with PVA fibre with 2.0% volume fraction mix is kept as reference mix, hybridation is made with PVA (1.35%) and steel (0.65%), PVA (1.00%) and steel (1.00%) and finally with PVA (0.65%) and steel (1.35%). This hybridization has a remarkable achievement in mechanical properties and in the flexural behavior in ECC layered RC beam. From the results, it has been observed that mono fiber ECC reinforced with PVA of 2.0% and hybrid fiber ECC reinforced with 1.35 % of PVA fiber and 0.65% of steel fiber has reasonable flexural characteristics than the conventional beam.

This study focuses to develop a new hybrid Engineered Cementitious Composite (ECC) and assesses the performance of a new hybrid ECC based on the steel short random fiber reinforcement. This hybrid ECC aims to improve the tensile strength of cementitious material and enhance better flexural performance in an RC beam. In this study, four different mixes have been investigated. ECC with Poly Vinyl Alcohol (PVA) fiber and PolyPropylene (PP) fiber of 2.0% volume fraction are the two Mono fiber mixes; ECC mix with PVA fiber of 0.65% volume fraction hybridized with steel fiber of 1.35% volume fraction, PP fiber of 0.65% volume fraction hybridized with steel of 1.35% volume fraction are the two additional different hybrid mixes. The material properties of mono fiber ECC with 2.0 % of PVA is kept as the reference mix in this study. The hybridization with fibers has a notable achievement on the uniaxial tensile strength, compressive strength, Young’s modulus, and flexural behavior in ECC layered RC beams. From the results, it has been observed that the mix with PVA fiber of 0.65% volume fraction hybrid with steel fiber of 1.35% volume fraction exhibit improvements in tensile strength, flexural strength, and energy absorption. The PP fiber of 0.65% volume fraction hybridized with steel of 1.35% volume fraction mix has reasonable flexural performance and notable achievement in displacement ductility over the reference mix.

The latest thesis deals with the issues of natural fiber in order to observe the strength properties and even a reduction in the replication of the shrinkage crack problemsin concrete. The organic fibers such as coir, palm, kenaf, jute, sisal, banana, pine, sugarcane and bamboo etc. Various researchers are studied as building materials that can be found in cement paste, mortar, concrete. It was observed that the results of few fiber are most promising and given below. The present work focuses to improve the ductility and strength properties of concrete on bringing out. The same proportions of different fibers cannot be changed by all the normal concrete. This research may include the characteristics, behaviors and consistency of the fibers between themselves. Finally, the study focuses solely on similarities and variations between all kind of natural fibers. The goal of this analysis is to provide an analysis of the factors influencing the overall performance and reliability. The proportions for comparisons and conclusion were studied.

ABSTRATO Compósito Cimentício Projetado (ECC) é um tipo de compósitos cimentícios reforçados com fibras de alto desempenho melhorados com bom comportamento de tração, compressão e flexão. O ECC é conhecido por seu comportamento de endurecimento de tensão sob tensão e tem sido cada vez mais aplicado na prática de engenharia. O processo de adicionar duas ou mais fibras em uma mistura é conhecido como hibridização. Os drives de compósitos híbridos se beneficiam de cada uma das fibras individuais adicionadas e exibem maior capacidade de resistência e deformação em comparação com os compostos de fibra monofibra. As principais aplicações da CEC são um reforço estrutural na construção e também a hibridização de fibras orgânicas são válidas apenas para condições subaquáticas e fornecerão testes adicionais relativos à capacidade de combus-tão ou inflamabilidade. Este trabalho apresenta os resultados obtidos a partir de três misturas de ECC (PVA, PP, STEEL) e quatro Compósitos Cimentícios Híbridos de Engenharia (HECC) com diferentes combinações de fração volumétrica com PVA, PP, STEEL. Os estudos experimentais foram realizados para investigar os comportamentos mecânicos de CEC e HECC. Os resultados indicam que este processo de hibridação tem um desempenho notável na resistência à compressão, resistência à tração direta e resistência à flexão.

The thermal properties of polymer fibers namely polyvinyl alcohol fiber (PVA) and polypropylene fiber (PP) have been taken for study to carry out this present work. Simulated pore solution (SPS) is prepared by using the combination of chemicals NaOH, KOH, and Ca(OH)2 with distilled water to study the effect of C-S-H gel formation on fibers. The fibers are dipped in the solution for 35 days. The thermal properties of raw and SPS-dipped fibers are fetched out by performing various tests such as Fourier transform infrared (FTIR) analysis, thermo gravimetric analysis (TGA), differential scanning calorimetry analysis, and scanning electron microscopy (SEM). On analysis, the thermal properties of SPS-dipped fiber have better properties when compared with raw fiber. In FTIR analysis the first broad peak of both raw and SPS-dipped fibers are observed between 3000 cm−1 to 2800 cm−1 indicating that fibers have strong bond. In TGA analysis noted that the residual mass of raw fiber (77.19%) is higher than SPS-dipped fiber (52.33%) due to the formation of C-S-H gel formation. DSC analysis showed both endothermic and exothermic reaction under N2 atmosphere.