Noise Pollution from Vehicular Traffic from Selected Junctions in Bengaluru

By
Paul Pop, Rashmi Kulranjan, Nived Uthaiah. P, Radhika V G
St Joseph’s College, Bengaluru
Mahesh Kashyap, Consultant, Bengaluru

ABSTRACT
Noise pollution can be defined as the unwanted sound that is released to the environment and disturbing the human beings. Sources of noise pollution include industrial sources, non-industrial sources, vehicles, uncontrolled use of loud speakers, construction activities such as drilling, etc. Noise levels from vehicles through engines and horns are the main cause of concern in cities and may potentially contribute about 60% of total noise pollution. An attempt was made to measure noise levels emanating from vehicles on selected roads within a radius of approximately two kilometers from St Joseph’s College. These are major roads that witness heavy traffic during peak and non-peak hours. Traffic volume and noise levels were measured at various junctions on these roads during peak and non-peak hours. The study also includes remedial measures that can be implemented to reduce the noise levels.

Keywords: Noise, Vehicles, Pollution, Decibels
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Aquifer Characteristics in UYO Metropolis

BY
UKPONG, E. C and ABARAOGU, Civil Engineering Department, Faculty of Engineering University of Uyo, Akwa Ibom State, Nigeria.
and
UDECHUKWU JOHN Civil Engineering Department, Faculty of Engineering University of Uyo, Akwa Ibom State, Nigeria.

ABSTRACT
The description and location of geologic formations and water-bearing zones within the study area are discussed. The geologic aquifer in the area are the upper, medium and lower sands. Pumping test and soil sample data were obtained from Ifa Atai, State Secretariat and Ewet Housing Estate all in Uyo metropolis were analysed. The analysis reveals the following Aquifer and well characteristics, permeability (3.74-20.952) m/d, transmissivity (146.13-914.63) m2/d, storativity (0.141-0.181), specific capacity (4.26-28.69) m3/h/m, well efficiency (77.31-95.03%), expected drawdown (4.36-29.34)m. The result shows that the geologic formation have good water-bearing formations with medium sand being predominant. Draw down values after prolonged pumping test are indicative of high well productivity. Generally the aquifers in the study area are permeable and of high storage capacity.

Keywords: Pumping test, soil sample data, geologic formations, aquifer, permeability, and specific capacity.

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CONCRETE QUALITY CONTROL DURING CONSTRUCTION

By
1) KAUSHAL KISHORE
Materials Engineer
Roorkee
Kaushal Kishore is retired from IIT, Roorkee and now a Consulting Materials Engineer. He has over 50 years of experience in all types of Concrete Mix Design.

2) RAKESH SHARMA
Vice President Project
Supertech Limited
Rakesh Sharma is Vice President Project of M/s Supertech Limited. He has 28 years of experience in Construction.

I.T. Park, Doon Square Mall at Dehradun, Uttarakhand is being constructed by M/s Supertech Ltd. For this site M-30 grade of concrete suitable for pumped concrete is required. Aggregates for construction was stored at site. Its analysis report is given in Table 2.

For laboratory trial 5 brands of PPC cement bags were taken from local market. They were identified as cement brand, 1, 2, 3, 4 and 5. Two reputed brands of normal superplasticizers based on sulphonated naphthalene formaldehyde (SNF) were taken for trials. They were identified as SP (A) and SP (B) to find their compatibility with the given 5 brands of PPC cement identified as cement brand 1, 2, 3, 4 and 5.

COMPATIBILITY
The behavior of concrete in the presence of superplasticizers is related to the amount and type of sulfate added to the clinker. The rheological and setting Behavior are changed depending on whether the sulfate is added as anhydrite, hemihydrates, or gypsum. The difference are explained by the different rates of dissolution of these sulfates.
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Concrete Strength Acceptance Criteria IRC:15-2011

By
KAUSHAL KISHORE
Materials Engineer, Roorkee

For concrete roads, flexural strength of concrete is the design criteria. For all major projects, flexural strength of the mix shall be determine by third point loading of flexural beams size 150 mm x 150 mm x 700 mm as per IS: 516. Determination of flexural strength by correlating with cube strength (compressive strength) shall not be allowed for major projects, as the correlation is not well established.

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Concrete Strength Acceptance Criteria IS:456-2000

By
KAUSHAL KISHORE
Materials Engineer, Roorkee

Strength of concrete is commonly considered its most valuable property, although in many practical cases, other characteristics, such as durability and permeability, may in fact be more important. However, the strength of concrete is almost invariably a vital element of structural design and is specified for compliance purposes.

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