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The effect of particle pumice treatment on the flexural properties of the GFRP composite has been investigated. The local pumice from Rinjani mountain in Lombok Island Indonesia has been treated with a crushing process, calcination, and acid leaching treatment withHCL solution. The pumice particles embedded in unsaturated polyester resin (UPRs) were used as a matrix to bond the glass fiber with the configuration of CSM/WRM/CSM. The composite specimens were carried out for a three-point bending test, and their fracture surfaces were observed using SEM. The result shows that the GFRP composites have an increase in flexural strength and modulus along with the increasing pumice particle content. However, the composite with 40% particles has a decrease in its strength and modulus. The calcination and acid-leaching treatment with HCL solution of the pumice particles causes an increase in the flexural strength and modulus due to an increase of porosities on the particles. The GFRP composite with an acid-leaching particle content of 30% (wt) has good particle distribution, and there is less fiber pull-out and no void. Otherwise, the composite with 40% of particle content has long fiber pull-out and void. [ABSTRACT FROM AUTHOR]

The effect of different reinforcement material on mechanical and tribological properties of composite friction brake was studied. This paper aims to investigate the effect of rockwool and glass fiber on specific wear rate, friction coefficient, and flexural strength of composite. Composite specimens were manufactured utilizing a sequential processing as follows: mixing of composite ingredients, cold pressing of the mixture, hot pressing of the preformed specimen, and then post curing of the hot molded specimen. Hot press was carried out under a pressure of 20 MPa at 160 °C. Friction characteristics of composite were measured using pin on disc tribometer. Three-point bending test was carried out to obtain composite flexural strength. The results showed that rockwool had a higher effect on increasing coefficient of friction, specific wear and flexural strength of composite compared to glass fiber. Fiber fracture, fiber pull-out and void were found on the fracture surface of the bending test specimens. [ABSTRACT FROM AUTHOR]

Carbon fiber is a synthetic fiber with high tensile strength and low density compared to other fibers. The use of carbon fiber as reinforcement for thermoset composites is augmented every year. It has an impact on growing the amount of carbon fiber reinforced composite waste. So that, the recycling of carbon fiber from composite waste is needed. In this study, carbon fiber recycling was carried out by a solvolysis process in a PEG solution and NaOH catalyst. The result was added to polyester resin with variations in the fiber volume fraction of 0, 10, 20, 30, 40 to form a composite. The results showed that the maximum bending strength of 220.62 MPa and impact strength of 109.54 kJ/m2 was obtained in composites reinforced with 40% recycled carbon fiber (RCF). It was due to the enhancement of the number of fibers capable of supporting the load when the fiber volume fraction increased. [ABSTRACT FROM AUTHOR]

The aim of the research is to investigate the effect of fiber length on the flexural and impact properties of the composite of Zalacca Midrib Fiber (ZMF)/HDPE. The process of making composite was using compression molding method. The variation of fiber length were 1 mm, 3 mm, 5 mm, 7 mm and 9 mm, at 30% fiber volume fraction. The flexural and impact test according to ASTM D790 and ASTM D5941, respectively. Observing fracture surface was examained by using Scanning Electron Microscopy (SEM). The results showed that the flexural and impact strengths would be increase with the increase of fiber length. [ABSTRACT FROM AUTHOR]