[en] According to National Statistics Approximately 1.35 billion gallons of used oil are generated yearly. With the increasing of the concrete usage, a more cost effective and economic new type of admixtures may give positive impacts on the Malaysian construction building as well as worldwide concrete usage. To objective of this is study is to investigate the effect of used cooking oil in terms of slump test, compressive strength test and rebound hammer. By adding the used cooking oil to the concrete, it increases the slump value from 4% to 72%. And the compressive strength have an increment from 1% to 16.8%. The used cooking oil obtains the optimum contribution to the concrete mix proportion of containing used cooking oil of 1.50% from the cement content. The result of used cooking oil from experimental program of slump value and compressive strength proved that used cooking oil have positive effects on replacement of commercially available superplasticizer.

[en] Optimization of transmission tower structures is traditionally based on either optimization of members sizes with fixed topographical shape or based on structural analysis modelling strategies without taking cognizance of fabrication and constructability issue facing the contractors . This paper look into an integrated optimum design approach strategies whereby size, shape and topology are combined together with the fabrication issues in the construction of the transmission tower. The topographical algorithm is based on changing the inclination degree of the legs of the tower at first with optimum individual members sizing and later rationalized member sizes are performed through member groupings for the ease fabrication and construction of the transmission tower. The optimum weight using topographical algorithm obtained for the transmission tower is 10,924 kg for singular members and 18,430 kg for element grouping at 10° inclination angle.

[en] Fibres Reinforced Concrete has received much interest in the concrete research world over the last few decades. Assimilating fibres into concrete structures has many advantages. Previous study discovered that the addition synthetic or natural fibres to concrete enhanced the material’s thermal properties as well as its strength to some extent. Fibres, on the other hand, have an influence on the thermo-mechanical properties of concrete. The aim of this research is to see whether applying Polypropylene and Kenaf fibres to cement mortars of various compositions has any potential (0.1 %, 0.2 %, and 0.3%). Eight separate mixes were tested in this report. The addition of PP and Kenaf fibres reduced the workability of the mortar samples as measured by flow ability, compressive strength, tensile strength, and thermal conductivity. In contrast to other ratios, cement mortar containing 0.1% PP and Kenaf fibres have highest compressive strength, while samples containing 0.3% recorded highest tensile strength which are 6.2 MPa and 7.2 MPa respectively. When higher percentages of both fibres are used in mortar samples, the thermal conductivity decreases. It can be inferred that adding a certain percentage of fibre to a composite can boost both mechanical and thermal properties. (paper)