Characteristics of Concrete Produced with Lagoon and Atlantic Ocean Water

Dwellers along the coastline area of Lagos state, Nigeria are exposed to abrmdant supply of the natural resources of Atlantic ocean and Lagoon water and may not have the privilege of having potable drinking water at their disposal for producing concrete. This study evaluates the characteristics of concrete produced with Atlantic ocean and Lagoon water. Concrete produced with tap water (regarded as potable drinking water) serves as the control experiment. Compressive strength, workability and density were used to evaluate the characteristics of concrete specimens. All the concrete samples have true shnnp with Lagoon water concrete having low workability and both tap and Atlantic ocean water concrete having medilllll workability. The concrete specimens produced with the three types of water fall into the category of normal weight concrete as their densities lie within the range of 2200-2600 kg m-3 specified. The 28th day compressive strength of concrete specimens produced with Atlantic ocean, tap and Lagoon water are 25.0 and 33.5 N mm-2 , 17.9 and 28.6 N mm-2 as well as 15.1 and 19.4 N mm-2 for mix ratios 1:3:6 and 1:2:4, respectively. It was concluded that tap water should be used in mixing concrete where strength is of major concern, Atlantic ocean water could be used where early strength is required and Lagoon water should only be used for general concrete works where strength is of less importance such as in mass concrete, floor screed and mortar

Physico-chemical properties and heavy metal content of water sources in Ife North Local Government Area of Osun State, Nigeria

The water quality examination in Ife–North Local Government of Osun State Nigeria was conducted by determining the physico–chemical parameters of 40 samples. Surface water, bore holes, wells and pipe borne water samples were collected from major towns in the Local Government Area and analyzed. Results showed temperature range of 26.5 to 33.0°C, pH (6.53 to 8.90), conductivity (63.0 to 1039.0 μS/cm), resistivity (0.00 to 0.02mΩ.cm), salinity (300.00 to 700.00 mg/L), total solids (90.00 to 1175.00 mg/L), total dissolved solids (37.80–622.50mg/l), suspended solids (34.50 to 794.00 mg/L),dissolved oxygen (4.48 to 9.48 mg/L), Biological Oxygen Demand (BOD5) (0.69 to 6.74 mg/L), chloride (3.64 to 184.04mg/L), Nitrate (1.08 to 53.03 mg/L), phosphate (4.99 to 23.07 mg/L) and sulphate (6.02 to 28.95 mg/L). Results of Atomic Absorption spectrophotometric analysis (AAS) of samples for dissolved trace metals; (Cd, Pb, Mn, Zn, Cu, Cr and Fe), showed mean metal concentration to vary widely depending on the source of the water sample as follows: Pb (0.29 ± 0.05 to 6.69 ± 0.53 mg/L), Cd (0.77 ± 0.06 to 2.24 ± 0.08 mg/L), Zn (0.03 ± 2.15 to 0.22 ± 4.64 mg/L), Cu ( 0.18 ± 16.34 to 0.41 ± 5.00 mg/L), Fe (6.00 ± 0.21 to 31.75 ± 0.80mg/L) and Mn (0.14 ± 6.12 to 0.23 ± 99.11 mg/L). The results obtained for the physical parameters agreed with the limits set by both national and international bodies for drinking and domestic water with few exceptions.Key words: Quality, physico-chemical, atomic-absorption-spectrophotometer, domestic, recreational, Ife-North-Local-Government

Determination of the levels of some heavy metals in African pear (dacryodes edulis) marketed in Lagos metropolis, Nigeria

This paper presents the assessment of Pb, Cd and Zn concentrations in the African pear (Dacryodes edulis) sold in eight popular markets in Lagos metropolis, Nigeria. The concentrations of these metalsranged from 0.01±0.002ìg/g to 3.00±1.00ìg/g with Pb having the highest concentration of 3.00±1.00ìg/g.There was significant difference in the level of Pb in the fruits sold at Ikeja and other markets in March (

Strain and age of Dam effect on the reproductive and internal egg quality traits of crossbred chicken

No Abstract.Nigerian Journal of Genetics Vol. 19 2005: pp. 23-3