Effects of using glasswaste cullets as aggregates in concrete
- Authors: Dibodu, Lerato S. , Ekolu, Stephen O.
- Date: 2017
- Subjects: Glass cullets , Alkali-silica reaction , Fine aggregates
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/248093 , uj:25782 , Citation: Dibodu, L.S. & Ekolu, S.O. 2017. Effects of using glasswaste cullets as aggregates in concrete.
- Description: Abstract: Glass recycling in South Africa is actively employed to promote environment sustainability. However, considerable quantities of waste are generated during this recycling process, which is disposed-off to landfills. The present study was conducted to investigate potential use of glass waste cullets in concrete. Concrete of water/cement ratio = 0.75 was used to prepare 100 mm (4 in.) cubes, 100 x 100 x 200 mm (4 x 4 x 8 in.) double cubes and 50 x 50 x 285 mm (2 x 2 x 11.4 in.) prisms. Control mixtures were made using crushed granite coarse and fine aggregates, then glasswaste cullets were incorporated as sand replacements in proportions of 0, 30, 50 and 70% glass...
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Studies of Ugandan Volcanic Ash and Tuff
- Authors: Ekolu; S.O, Thomas; M.D.A and Hooton R.D
- Date: 2006
- Subjects: Pozzolans , Volcanic ash , Compressive strength , Alkali-silica reaction , Fineness , Mineralogy
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/61743 , uj:16841 , Ekolu, S.O, Thomas M.D.A and Hooton R.D (2006), Studies on Ugandan volcanic ash and tuff, Proc. 1st Intl. Conf. on Advances in Engineering and Technology, Entebbe, Uganda, July 2006, 75-83.
- Description: Abstract: This study was conducted to investigate certain characteristics of tuff and volcanic ash quarried from Mt. Elgon and Mt. Rwenzori in Uganda that may render the materials beneficial for use in industrial applications as pozzolans. Both tuff and volcanic ash materials were ground and blended with Portland cement at varied replacement levels and tested for several properties. It was found that incorporation of 20 to 25% volcanic ash gave the highest compressive strength and substantially reduced alkali-silica reac-tivity. The ash met ASTM requirements for ‘Class N’ pozzolans. This study suggests that the volcanic ash, when ground to 506 m2/kg Blaine fineness develops high quali-ties for potential use as a mineral admixture in cement and concrete. Conversely, the use of tuff was found to significantly increase alkali-silica reaction. This reiterates the possible harmful effects of some pozzolans to concrete if used without precaution, dis-cretion or thorough understanding of their characteristics.
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