FACULTY OF TECHNOLOGY

Permanent URI for this communityhttps://repository.ui.edu.ng/handle/123456789/269

Browse

Filters

2013 - 20142

Settings

Author: search.filters.author.Akinyemi B.A.Subject: search.filters.subject.cement

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Effects of waste glass powder as pozzolanic material in saw dust cement brick
    (2014) Omoniyi T.E.; Akinyemi B.A.; Fowowe A.O
    This work examines the possibility of using Waste Glass Powder (WGP) as a partial replacement of cement in saw dust composite brick to assess its pozzolanic activity and its effect on the properties of the composite. WGP was used to partially replace cement at 0%, 5%, 10%, 15%, 20%, 25%, and 30% in the production of test samples of 100x100x100mm at binder sand mixing ratio of 1:6. After casting the cubes, they were tested for compressive strength, water absorption, capillary water absorption and volume porosity. The results indicated that WGP can be used as cement replacement material up to 30% at particle size less than 100μm to prevent alkali silica reaction and this can be utilized in the manufacture of non-load bearing sandcrete block without any unfavourable effect. The study further revealed that waste glass, if ground finer than 100μm shows a pozzolanic behaviour because it reacts with lime at early stage of hydration forming extra CSH gel thereby forming denser cement matrix. The early consumption of alkalis by glass particles mitigate alkali-silica reaction by increasing durability of composite brick which is manifested in the result of volume porosity, water absorption, capillary absorption as well as in the results of sample densities.
  • Thumbnail Image
    Item
    Permeability coefficient and porosity characteristics of bagasse fiber reinforced concrete
    (2013) Omoniyi T. E.; Akinyemi B.A.
    The durability of concrete structures is a major challenge facing concrete community today. Porosity and permeability played paramount roles in determining the durability of concrete. The inclusion of fibre reinforcement in concrete can enhance some of its engineering properties. This paper investigated the influence of bagasse fibre inclusion on the porosity and permeability of concrete. A series of laboratory porosity and permeability tests were carried out. The fibre length varied from 10mm to 25mm while the volume ranged from 0 to 5% of cement mass. The results proved that bagasse fibre inclusion increased the porosity and reduced the permeability slightly initially and increased it afterwards. At fibre volume of less than 3%, the influence of different lengths of fibre on water permeability shows that high porosity does not mean high permeability. The main factor which governs permeability is the void spaces interconnections.