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Screeners – River Bed Uncrushed Aggregates For Concrete

By
Kaushal Kishore
Materials Engineer
Roorkee

INTRODUCTION:
SCREENERS companies near Dehradun and elsewhere have set up highly sophisticated as well as, eco-friendly screening and washing plants for the production of uncrushed (Shingle) coarse aggregates and coarse sand direct from river bed. These plants are producing and supplying uncrushed (Shingle) aggregates of sizes 40 mm, 20 mm, 12.5 mm and river coarse sand, which complies to the specifications of
IS : 383-19702.

Our construction sites, particularly Govt. Departments hesitates in the use of uncrushed coarse aggregate as so far they are being supplied to them direct from river bed or by manual sieving without washing them with water. Thus neither they are clean nor properly graded. This draw back is not with the uncrushed aggregates produces and supplied from SCREENERS modern plants with regular quality control. In this booklet the readers will find that when quality uncrushed aggregates are available not only economically but locally, our construction sites particularly Govt. Departments should not hesitate in the use of uncrushed aggregates from the river bed and save our environment, as crusher generate pollution. Further in all the Civil Engineering Codes uncrushed aggregates from river bed has been specified to be used in our all Civil Engineering Construction.
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Assessment of Ground Water using GIS and its importance in Trenchless Technology

By
Korukonda Vinay

Abstract
This paper describes the results of a ground water potentiality assessment and its importance in the field of trenchless technology. Water plays a vital role in the development as well as for depletion of any activity in the area . Thus, the availability of surface and ground water governs the process of planning & development of any activity. The surface water resources are inadequate to fulfill the water demand. Productivity through groundwater is quite high as compared to surface water, but groundwater resources have not yet been properly developed through exploration. Keeping this in view, the present study attempts to identify and understand groundwater potential zones of the study area using GIS. The methodology includes the construction of groundwater potentiality map using Geographical Information System (GIS) to protect the groundwater resources in the study area and to formulate recommendations to reduce the water scarcity. The ground water potentiality of the area has been assessed through integration of the relevant layers which include geomorphology, geology, slope and land use/ land cover, in ArcGIS environment. Criteria for GIS analysis have been defined on the basis of ground water conditions and appropriate weightage has been assigned to each information layer according to relative contribution towards the desired output. The ground water potential zones map generated through this model was verified with the yield data to ascertain the validity of the model developed and to find its corresponding influence in the subsurface constructions.
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Case Study on Noise Level in Mysore City

By
Naveen G.M 1, Vinay Kumar B.M2
1. Lecturer, Dept. of civil Engg, V.V.I.E.T, Mysore.
2. Lecturer, Dept. of civil Engg, V.V.I.E.T, Mysore.

Abstract
Sound comes from the vibrations in molecules, and is always traveling through a substance, whether it is a solid, liquid, or gas. Sound cannot travel through a vacuum because there are no molecules for the sound to travel through. Noise pollution (or environmental noise) is displeasing human-, animal- or machine-created sound that disrupts the activity or balance of human or animal life. A common form of noise pollution is from transportation, principally motor vehicles. Noise health effects are both health and behavioral in nature. The unwanted sound is called noise. This unwanted sound can damage physiological and psychological health. Noise pollution can cause annoyance and aggression, hypertension, high stress levels, hearing loss, sleep disturbances. In the present study, attempts are made to study the noise level range at different roads of the Mysore city. Traffic behaviour and characteristics at various roads near schools, hospitals, railway tracks, offices, courts, etc. using “Sound Level Meter”. Then, the maximum value of noise level in decibels is Estimated.

Keywords: Noise and Sound level meter.
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Effect Of Different Curing Methods On The Compressive Strength Of Concrete

By
O. James ,P.N.Ndoke and S.S.Kolo
Department Of Civil Engineering, Federal University Of Technology.
Minna.

ABSTRACT
Normal concrete was prepared with a water-cement ratio of 0.50. cube specimens were cast for testing the compressive strength at 7 and 28 days of curing respectively using three curing methods namely immersion, sprinkling and Plastic sheeting, curing to cure the cube specimens until the day of testing. Test results indicates that water curing (WAC) as well as sprinkling (spraying) curing provided much better results than membrane (Plastic Sheeting) method of curing. The rate of drying was significant when the specimens were subjected to membrane (Plastic sheeting) method of curing. This thus hampered the hydration process and thus affected the compressive strength property of the hardened concrete. The overall finding of this study suggests that concrete should be cured by water curing to achieve a better compressive strength.

Keywords:
Curing method, compressive strength, concrete
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IS 10262-1982 Vs IS 10262-2009: A Discussion

By Narasingha Mohanta
(Research Officer, Zonal Laboratory (R&B) Balangir)

Abstract:
IS:10262 is the code specified by Bureau of Indian Standards for Concrete Mix Design. The code came to existence in the year 1982. Keeping pace with the advancing technology the code has been revised in December 2009. Significant changes have been made in the revised version and a brief discussion is presented in this paper comparing the two versions of IS:10262. The basic points where the guidelines have been modified are discussed. Besides one numerical example has been solved using guidelines of both the versions to understand the differences. Though the 2009 version encourages mixing of mineral admixtures to meet greater challenges of modern concreting, a simple example is considered with use of no additives.

Introduction
Mix Design of Concrete is the process of deciding the proportions of the ingredients of concrete so as to be produced most economically, that would satisfy the desired properties of fresh and hardened concrete as well. In simpler words, the concrete should be well workable when fresh and the designed compressive strength as well as durability should be achieved at hardening.
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