Ahmad Azrem Azmi
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/39332
This page provides access to scholarly publication by UniMAP Faculty members and researchers.2024-03-28T14:21:05ZEffect of Crumb Rubber on compressive strength of fly ash based Geopolymer concrete
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/69144
Effect of Crumb Rubber on compressive strength of fly ash based Geopolymer concrete
Ahmad Azrem, Azmi; Mohd Mustafa Al Bakri, Abdullah; Che Mohd Ruzaidi, Ghazali; Sandu, Andrei Victor; Kamarudin, Hussin
This study explores the effect of different percentage of crumb rubber on compressive strength of fly ash based geopolymer concrete. This research attempted to produce rubberized geopolymer concrete as an environmentally friendly, lightweight and durable product. Crumb rubber with ranged size from 73 μm to 375 μm was used in order to replace fine aggregates in geopolymer concrete. The replacements of crumb rubber were 0%, 5%, 10%, 15% and 20% in the fly ash based geopolymer concrete. The ratio of fly ash to alkaline activator was 2.5 and the ratio of Na2SiO3 to NaOH was fixed at 2.0. After the curing process, the strengths of the samples were tested on days 7 and 28. The results show that there is a reduction in all compressive strength for crumb rubber mixture, but still higher than normal rubberized concrete. Rubberized geopolymer concrete is a suitable solution in some non structural applications.
Link to publisher's homepage at https://www.matec-conferences.org/
2016-01-01T00:00:00ZPhysical and morphological properties of styrene butadiene rubber/recycled chloroprene rubber (SBR/CRr) blends - The effects of TOR as a compatibilizer
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/33588
Physical and morphological properties of styrene butadiene rubber/recycled chloroprene rubber (SBR/CRr) blends - The effects of TOR as a compatibilizer
Ahmad Azrem, Azmi; Nik Noriman, Zulkepli, Dr.; Razif, Mohammad Nordin, Dr.; Sam, Sung Ting, Dr.
The effects of physical and morphological properties of TOR as a compatibilizer of styrene butadiene rubber/recycled chloroprene rubber (SBR/CRr) blends were investigated. Blends. Both uncompatibilised and compatibilised SBR/CRr blends were prepared using a two roll mill at room temperature with blends ratios 95/5, 85/15, 75/25, 65/35 and 50/50. It can be seen that, both hardness and crosslink density of uncompatibilised and compatibilised SBR/CRr belnds increased with increasing of CRr content. The incorporation of CRr in the SBR/CRr blends enhanced the cross-linking density properties of SBR/CRr blends. The scanning electron microscopy (SEM) illustrates the tensile fracture surface of compatibilised SBR/CRr blends at 5 and 50 blend ratios more rougher surfaces with many tearing lines compared to uncompatibilised SBR/CRr.
Link to publisher's homepage at http://www.ttp.net/
2014-01-01T00:00:00ZThe effects of carbon black and calcium carbonate as a filler on cure characteristic and physical properties of SBR/CRr blends
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/33414
The effects of carbon black and calcium carbonate as a filler on cure characteristic and physical properties of SBR/CRr blends
Ahmad Azrem, Azmi; Nik Noriman, Zulkepli, Dr.; Muhammad Razif, Nordin
Filler are compounding ingredients added to a rubber compound for the purpose of iether reinforcing or cheapening the compound. Despite that, fillers can also be used to modify the physical properties of both unvulcanized and vulcanized rubbers. Typically filler materials include carbon black, calcium silicate, calcium carbonate and clay [. The mechanism of reinforcement of elastomers by fillers has been reviewed by several workers. They considered that the effect of filler is to increase the number of chains, which share the load of a broken polymer chain. It is known that in the case of filled vulcanizates, the efficiency of reinforcement depends on a complex interaction of several filler related parameters. They include particle size, particle shape, particle dispersion, surface area, surface reactivity, structure of the filler and the bonding quality between the filler and the rubber matrix.
Link to publisher's homepage at http://www.ttp.net/
2013-12-01T00:00:00ZPhysical and morphological properties of styrene butadiene rubber/recycled chloroprene rubber (SBR/CRr) blends
http://dspace.unimap.edu.my:80/xmlui/handle/123456789/32845
Physical and morphological properties of styrene butadiene rubber/recycled chloroprene rubber (SBR/CRr) blends
Ahmad Azrem, Azmi; Nik Noriman, Zulkepli, Dr.; Razif, Mohammad Nordin, Dr.; Sam, Sung Ting, Dr.; Saiful Nizwan, Mhd Salleh
The effects of physical and morphological properties of styrene butadiene rubber/virgin chloroprene rubber blends (SBR/CRv) and styrene butadiene rubber/recycled chloroprene rubber blends (SBR/CRr) were investigated. Both SBR/CRv blends and SBR/CRr blends were prepared using two roll mill at room temperature with blend ratios 95/5, 85/15, 75/25, 65/35 and 50/50. The range size of CRr used in this study was 0.3 - 0.7 mm. The SBR/CRr blends shows higher value of hardness and crosslink density compared to SBR/CRv blends at all blend ratios. The scanning electron microscopy (SEM) of tensile fracture surface of SBR/CRr blends at 15 blend ratio illustrated a better adhesion and dispersion of CRr with SBR matrix compared with SBR/CRv blends.
Link to publisher's homepage at http://www.ttp.net/
2013-01-01T00:00:00Z