GBEM2019

Keynote Speakers/主讲嘉宾

Prof. Hui-Mi Hsu

National Dong Hwa University, Taiwan

徐辉明教授，台湾东华大学

Title: Discussion of Mortar Blended with Basic Oxygen Furnace Slag

The study performed the various experiments by grounding Basic Oxygen Furnace Slag (BOFS) to the three specimens of each mixture were tested at 3, 7, 14, and 28 days. The major objectives can be classified as (1)Feasibility of using finer BOFS particles in cement-based composites was investigated and analysed, (2)BOFS as a cement replacement in blended mixture, with the fineness and proportion of BOFS used as variables in experiments, (3)Inclusion of high-amount BOFS (70% replacement of cement) in cement-based composites was also tested and evaluated. The study was concluded as (1)Fineness of the BOSF was the primary factor influencing the fluidity of BOFS mortar. Inclusion of 10000 cm2/g BOFS had a particularly pronounced effect in reducing fluidity, (2)Increasing the amount of BOFS (B5 and B7) used as a replacement for cement was shown to speed up the initial and final setting times, (3)Replacement of cement with BOFS resulted in increased expansion and cracking, particularly when BOFS was used to replace more than 50%, (4)Specimens that included 10% BOFS achieved the highest compressive strength at 28 days; however, even this was 5% lower than that of OPM.

Prof. Zakiah Ahmad

UNIVERSITI TEKNOLOGI MARA, Malayisa

Title: Development of strength class for Tropical Hardwoods for Sustainable Future Through Timber Construction

For economical and safe design for timber structures, European countries has moved to limit state design and published harmonized design standard which is Eurocode 5 (EC 5). Currently the design method for timber structures in some Asian countries especially Malaysia, are still based on permissible stress design. In order to move to limit state design, new sets of data are required since the strength data in the present standards are derived from small clear specimens which is in contrast with the European standards, where the strength data are based on structural size specimens. To adopt directly the strength class as published in EN 338 for tropical hardwood, may imposed some uncertainties. The densities of European timbers range from 400-1000 kg/m3. However, the densities of tropical hardwood timbers are in the range of 400-1300 kg/m3. When analysing the strength data in Table 1 and Table 3 of EN 338, it can be seen that some of timbers may not fit well for tropical hardwood timbers have high modulus of elasticity and also densities. Therefore, this case study investigates the mechanical properties of 9 tropical hardwood timbers of different densities. There were 18000 numbers of specimens sourced from four different regions in Malaysia and tested for bending, compression, tensile and shear capacity. The tests were carried out in accordance with EN 408 and the analysis follows EN 384. Based on this study, a new strength class for tropical hardwood has been suggested.