The durability characteristics of Engineered Cementitious Composites (ECC) with various fibers such as polypropylene and glass were investigated in view of developing composites with high resistance to cracking. ECC offer large potential for durable civil infrastructure due to their high tensile strain capacity and controlled micro-crack width. In this study, fibre volume fractions (0.5%, 1%, 1.5%, and 2%) of both polypropylene and glass fibers varied and durability measures such as a rapid chloride penetration test, sorptivity, water absorption, acid attack, and sulphate attack were measured. Increasing the fiber content up to 1.5% improved the durability properties of ECC. The test results indicate that the glass fiber-reinforced Engineered Cementitious Composites have better durability characteristics than polypropylene fiber-reinforced ECC.

Metal matrix composites possess some glamorous properties like light weight, low density ,high strength-to-density ratio, formable to complex shape, lower manufacturing cost and are used more in commercial, industrial, marine, naval based industrial and are extensively used in automobiles and aerospace like empennage, wings, fuselage in fighter aircraft, bomber, transport, general aviation, rotary aircraft etc. Many researches are done on micro structural metals matrix composites and they result shows that composite of micro structural having good mechanical properties. Instead of using micro structural nanoparticles are used for better mechanical properties and better applications in aeronautical field. The present study is an attempt to prepare and analysis of mechanical properties of Aluminium 6061 reinforcement with TiB2nanoparticles using liquid metallurgy. By the use of ball milling process the TiB2micro particles are converted in to nanoparticles and reinforced with Aluminium 6061 in stir casting process. The addition level of reinforcement is being varied from 0-15wt% in step of 4 wt%.Test carried out on the fabricated composite included scanning electron microscopy, XRD, EDAX analysis, and Thermal analysis.

Nanostructured zinc oxide (ZnO) has been synthesized via a one step solution based wet chemical method. Zinc acetate dihydrate (Zn (CH3COO)2 · 2H2O) was used as the precursor and its growth conditions were optimized for the formation of nanostructured ZnO. The powder pattern X-ray diffraction data of synthesized ZnO confirm particles of radius of about 20 nm with wurtzite hexagonal phase and preferential growth along (101) plane. Transmission electron microscopic results support the particle size value obtained through X-ray diffraction study. Clusters of nanostructured ZnO in agglomerated form are observed in scanning electron micrographs. The absorption bands observed at 509 cm−1 and 406 cm−1 in infrared spectra are assigned to ∊M-O of the synthesized compound. The absorption spectrum shows a narrow peak near the band edge in the exciton absorption region at about 371 nm and a blue shift is observed with respect to the bulk exciton absorption, 375 nm. Thermo-gravimetric analysis indicates weight loss corresponding to the formation of ZnO. The mechanism for the growth of nanostructured ZnO in solution has also been discussed.

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