Cold-formed steel (CFS) is a popular steel-based material for building such as roof truss system and wall frame panel. CFS with a variety of shapes, cross-sections and thickness produce a lot of advantages such as ease of production, corrosion resistance and high strength to weight ratio. Connection of the CFS sections between them uses screw, bolt and nut, rivet or weld. But, the detail information for the connector in standard either by Eurocode 3 or American Iron and Steel Institute (AISI) is still incomplete especially methods for testing and also lack in the basic knowledge of testing for the connector or combination of connectors. The connector that was used in this study was a self-drilling screw. The objective of the study is to provide the mechanical behaviour information of self-drilling screws from shear and pull-out tests. Both tests utilised Universal Testing Machine with 100 kN capacity to determine the ultimate load and load-deformation behaviour of the self-drilling screws with different numbers. As a result, the ultimate load of the specimen was found to increase with increasing number of the self-drilling screws for shear and pull-out connection tests.

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Concrete Paving Block (CPB) is made by mixing sand, gravel, cement, and water and is used in non-traffic and traffic areas. The CPB is proposed in a variety of shapes, sizes, colours, and materials. The demand for the CPB is increased in line by increasing in residential houses and building construction, and infrastructure activity. The advantages of CPB when compared with the rigid and flexible pavement is a more beautiful and interactive surface, fast-paced production without high technology equipment or skilled worker, and also creating a balanced humidity. Nowadays, concrete using waste materials such as cement, sand, or gravel replacement becomes more popular which supported the sustainable development requirement and goal. The replacement activity of concrete ingredients for promoting waste material with low carbon content in CPB is also part of the sustainable development programme which reduced the environmental impact of the waste material or production of natural concrete ingredients and cost production. With the intention of the issue, the CPB using bottom ash (BA) which is washed to reduce the carbon content is produced and tested for skid resistance, water absorption, and mechanical behaviour. The chemical and physical behaviour of WBA is conducted and shown the suitability to replace sand in CPB. The compressive strength of WBA with 100% of sand replacement in CPB illustrates the maximum load and compressive strength of approximately 1198.35 kN and 30.73 MPa and is appropriately used for paving blocks.

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