Browsing by Author "Akinyemi B.A."

Now showing 1 - 10 of 10

A management approach to construction and demolition wastes in ibadan metropolis
(2014) Omoniyi T.E.; Akinyemi B.A.; Nwosu S.C.
The construction and demolition waste impacts negatively on the natural economy and the environment. This paper examines some engineering and management approaches such as waste segregation, reduction concept, reuse concept, waste exchange concept and waste rethink concept to construction and demolition wastes in Ibadan Metropolis. Two sites each were visited for construction and demolition activities to observe and quantity their waste characteristics. Construction site A is of a 40.375m length by 39.225m width storey building at decking slap stage with a total waste components of 2500Kg having 32% of it as wood(planks) and 36% of it as bamboo. Construction site B has 42.1m length by 24.385m width storey building at lintel stage has total waste components of 625.5Kg with 48% of it being wood(planks) and 0.90% of it being cement bags(sacks). Demolition site C has a total of 10850Kg with 92.2% of it as concrete/brick wastes and 0.50% of it constitutes electrical and paper materials and demolition site D of total waste components of 8630Kg has 93% of it as concrete/brick materials and 2.3% as metal wastes. These figures show that an enormous amount of wastes are generated from construction and demolition activities and if not properly managed, it could negatively impact our environment. Therefore, it is ideal that appropriate measures are taken to ensure effective management of these waste hence the various waste components identified in all the sites under consideration can be harnessed and transformed into other uses.
Design and production specifications of machine for wood cement composite boards production
(2013) Omoniyi T.E.; Akinyemi B.A.; Olayiwola H.O.
Manual method of producing wood cement composites (WCCs) is time consuming, labour intensive and leads to inconsistent products. This paper reports the design and production specifications for a machine capable of automating the critical processes of mixing, blending, vibrating and compacting involved in WCC production for rural usage at a cottage level. It is a semi-continuous manually operated machine, made up of two broad units: the mixer and the former (conveyor cum press). The mixer is hand powered by a lever 500mm long at an average speed of 35rpm and has a capacity of 0.1514m3. The former is made up of rollers interconnected with chain drives and a freely rotating press roll. It is powered by a manually operated pulley system at an average speed of 4rpm. The mixer can save up to 52% of the total time required to achieve homogenous mix while the former can also reduce time required for board formation by 50%. The machine has an overall capacity of producing 30 Nos. of 12.5mm × 570mm × 570mm boards.
Development of bamboo – rice husk ash and cement mixture for livestock house roofing sheets
(2013) Omoniyi T. E.; Akinyemi B.A.; Olusoji A.O.
The purpose of this research is to design, fabricate and install locally developed roofing sheets on a king post truss model of a livestock house using rice husk and bamboo fibers which are readily available in most Nigerian farms with some additions of cement to the mixture. The effects of ratios of Rice Husk Ash (RHA) and bamboo fibers on the impact strength, density, thickness swelling and water absorption were also investigated. The average density of the composite roofing sheet produced ranged from 1779 to 2197Kg/m3. The control test specimen density was 2376Kg/m3. The addition of pozollan decreased the density of the composite. Thickness Swelling (TS) values ranged from 0.07 to 5.97% at two hours and from 0.08 to 6.5% at 24 hours for different composition. The percentage water absorption (WA) by the composite was from 0.17 to 1.13% at 2 hrs while it was 0.21 to 1.43% at 24hrs. However further research would be carried out on the structure to determine the thermal comfort of the livestock to be kept in the building.
Durability based suitability of bagasse-cement composite for roofing sheets
(2012) Omoniyi T.E.; Akinyemi B.A.
Accelerated and natural weathering of bagasse reinforced cement composite filled with rice ash pozollan used as roofing sheets were studied. In this paper, the durability of natural fibers such as sugarcane bagasse used as roofing sheets has been reported by conducting an experimental investigation. This investigation includes determination of mechanical strength properties such as compressive, tensile, modulus of rupture and flexural properties of the roof once every 3 months for a period of 8 years under alternate wetting and drying conditions and was exposed to ultraviolet light for the same period. The 8 years study showed no significant difference in the strength and sorption properties for the treated bagasse at 2% CaCl2 and the 20% replacement of cement with rice husk ash. This confirms that treated bagasse cement composite is suitable for both external and internal construction purposes.
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.
Engineering properties of acrylic emulsion polymer modified bamboo reinforced cement bonded composites
(2017) Akinyemi B.A.; Omoniyi T.E.
In this study, bamboo fibres from Bambusa Vulgaris species were used as reinforcement materials for acrylic emulsion polymer modified concrete to determine their engineering properties and elemental compositions. Moisture absorption, density and percentage voids were investigated as well as the compressive strength, flexural strength and split tensile strength at 28, 45 and 60 days of air curing. Acrylic polymers reduced moisture intake, increased the densities and led to another increase in percentage of voids but composite samples with bamboo fibre inclusions at 1.5% and 10% polymers with 1.5% fibre an 15% polymers showed better physical properties than those with polymers only. Compressive and split tensile strength tests had similar results of optimum strength at 45 days while flexural strength test had optimum value at 60 days of air curing. This showed that the properties of unreinforced concrete could be improved through addition of fibres and polymers for use in structural applications.
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.
Properties of latex polymer modified mortars reinforced with waste bamboo fibers from construction waste
(2018) Akinyemi B.A.; Omoniyi T.E
This study evaluated the properties of latex modified cement mortars from ordinary paints which were reinforced with treated bamboo fibers from construction waste. Fiber variations of 0, 0.5, 1 and 1.5% at 10% of the weight of cement were utilized. Mechanical properties were determined according to standards; similarly, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) were used to analyze the micro structural and elemental properties of the samples. The experimental results revealed that the addition of 1.5% bamboo fibers and 10% latex solution produced excellent mechanical properties. This was as a result of improved fiber adhesion to the matrix through pre-treatment, coupled with the contributed high strength from the latex paint modified mortars. The micro graph showed that latex precipitated in the voids and on the surface of the bamboo fibers as well as gels of calcium silicate hydrates which contributed to the observed improvement in strength of the tested samples.
Prospects of coir fibre as reinforcement in termite mound clay bricks
(2016) Akinyemi B.A.; Omoniyi T.E.; Adeyemo M.O.
The study is to develop an appropriate environmental friendly building material that would be sourced, obtained locally and used for construction of structures at a low cost by using termite mound soil, reinforced with 0%, 1%, 2%, 3%. and 4% coir fibres. Physical and mechanical tests were conducted on the different composition samples after curing. The particle size distribution showed that clay had the largest percentage with a moisture content of 3.53%, specific gravity of 2.0, liquid limit of 30.5% and plastic limit value of 25.4. The compressive strength test showed a decrease with increase in fibre content from 1% upward, modulus of rupture test showed that increase in fibre content leads to a corresponding increase in rupture while the modulus of elasticity test showed that from 3% to 4% fibre content, a decrease in the elasticity occurred. It can be concluded that low fibre inclusion into compressed termite mound brick is feasible if fibre content do not exceed 2% and thus can be used for both load and non-loading bearing structures.
Sorption characteristics of cement composite reinforced with some locally available lignocellulosic materials in Nigeria
(2013) Omoniyi T. E.; Olorunnisola A.O.; Akinyemi B.A.
The aim of this study was to investigate the sorption property of wood cement composite produced from bagasse (Saccharum officinarum), bamboo (Bambusa vulgaris) and coir (Cocos nucifera L). The mass of the fibre varies from 1 to 6% of the mass of cement. The result indicated that the mass fraction has significant effect on the sorption properties of the composites. Water absorption (W.A.) rate increases with increase in the fibre content of the composites. Thickness swelling (T.S.) in all the composites was less than 1.7% at 24 h water immersion at room temperature. There was linear correlation between mass fraction, water absorption and thickness swelling of the composites. The relatively low W.A. capacity and T.S. at content less than 3% of mass of cement suggests that they can be employed in outdoor situations and at this level they are dimensionally stable but beyond this level it is not advisable.