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Abstract. This research work is aimed to investigate how the addition of various proportion of polypropylene fibre affects the mechanical strength and permeability characteristics of recycled aggregate concrete (RAC) which has been produced with treated coarse recycled concrete aggregate (RCA). Further research on RAC properties and their applications is of great importance as the scarcity of virgin aggregate sources in close proximity to major urban centers is becoming a worldwide problem. In this study, the hardened RAC properties at the curing age of 7 and 28 days such as compressive strength, flexural strength, ultrasonic pulse velocity (UPV), water absorption and total porosity were evaluated and compare with control specimens. Experimental result indicates that although the inclusion of the treated coarse RCA can enhance the mechanical strength and permeability properties of RAC, Further modification by addition of polypropylene fibre can optimize the results.

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Nowadays, Malaysia's construction industry has risen to become one of the country's fastestgrowing industries. The application of green building is becoming more popular towards increasing the use of sustainable products in the construction industry. Nevertheless, due to rapid construction and low sustainable products for buildings, problems related to thermal comfort could indeed arise which may cause people stress and irritation. As a result, the objectives of this paper are to identify the issues, problems, concepts, and needs of Porous Ceramic Roof Insulation. In order to do so, extensive literature reviews conducted via various databases (i.e., Scopus, Web of Science, and Scopus) were explored. The findings have revealed that Porous Ceramic Roof Insulation has the potential to be marketed due to its great benefits (i.e., roof cooling, water absorption, solar absorption, and heat absorption within the building). Thus, it is anticipated that the study of Porous Ceramic Roof Insulation would improve the building's well-being while increasing thermal comfort.