J. Today’s Ideas - Tomorrow’s Technol.

Optimum Percentage of Sawdust and Brick Ballast in Light Weight Concrete

Neeru Singla and Mandeep Kumar

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  • DOI Number
    https://doi.org/10.15415/jotitt.2017.52002
KEYWORDS
PUBLISHED DATE December 2017
PUBLISHER The Author(s) 2017. This article is published with open access at www.chitkara.edu.in/publications
ABSTRACT

Construction industry relies heavily on conventional material such as cement, sand and gravel for the production of concrete The river sand and gravels which are most commonly used as fine aggregates and coarse aggregates respectively in the production of concrete, poses the problem of acute shortage in many areas, whose continued use has started posing serious problem with respect to its availability, cost and environmental impact. Attempt is being made in this project to use the locally available waste materials to replace the river sand and gravels to produce light weight and low cost concrete. Sawdust and Brick ballast are easily affordable at low costs, which are partially replaces with river sand and gravels respectively for making concrete. Natural sand and Gravels have been partially replaced (4% SD 8% BB, 4% SD 16% BB, 4% SD 24% BB, 8% SD 8% BB, 8% SD 16% BB, 8% SD 24% BB, 12% SD 8% BB, 12% SD 16% BB and 12% SD 24% BB. by using M30 grade of concrete) with sawdust and broken brick ballast respectively. For this, thirty concrete cubes of size 150mm X 150mm X 150mm have been casted and water cement ratio of 0.42 has been used. Water reducing admixture is used to increase the workability. Slump test, Compacting factor test and compressive strength at (28 days) of specimens having above combinations have been compared with control specimens. The workability and compressive strength gradually decreases for the increasing the replacement percentages. The optimum mix found to produce M30 grade of concrete is 8% of sawdust and 16% of Brick ballast

INTRODUCTION

As the time is passing, due to the development of infrastructure the construction industry is growing at a vast rate. Concrete is a mixture of cement, fine aggregates, coarse aggregates and water. Normally river sand is used as fine aggregates and stones or gravels are used as coarse aggregates in the concrete. These materials are limited on the earth. To overcome this type of problem researcher found substitute materials for aggregates. There are many types of waste materials available in our environment, which can be replaced with aggregates in concrete for making concrete. These waste light weight materials are sawdust, fly ash, Rice husk ash, cow dung and over burnt bricks etc. If these materials are directly disposed in our environment then it causes many problems. So these materials can be used as construction material for making concrete. The choice of these substitute materials depends upon availability; cost factor, physical and chemical composition of ingredients. Saw dust and brick ballast are the waste materials which can be replaced with fine aggregate and coarse aggregate respectively in concrete. Sawdust can be defined as loose particles or wood chippings attained as by products from sawing of timber into standard useable sizes. Sawdust is often dumped as waste products and about 105 million tonnes of sawdust are generated annually in India alone. The sawdust is light in weight as compare to river sand. During manufacturing of bricks in a kiln, high amount of over burnt bricks are produced which acts as a waste. These bricks can be recycled by using with replacement of coarse aggregates in concrete. The major volume of ingredients in concrete is the aggregates, it attains 60- 80% of the total volume of concrete. So that the cost of the whole concrete is largely depends upon the aggregates used Both these materials are light in weight, so that it is helpful to construct light weight structures These studies try to match social need for safe and economic disposal of waste materials with the help of environmental friendly industries, which need better and cost-effective construction materials.

Page(s) 112-122
URL http://dspace.chitkara.edu.in/jspui/bitstream/123456789/701/1/2%20-%20Optimum%20Percentage%20of%20Sawdust%20and%20Brick%20Ballast%20in%20Light%20Weight%20Concrete-%20Neeru%20Singla.pdf
ISSN Print : 2321-3906, Online : 2321-7146
DOI https://doi.org/10.15415/jotitt.2017.52002
CONCLUSION

The following conclusions have been found from the present work:

  • 28 days compressive strength of the concrete decreases gradually with increasing the replacement percentages. For the optimum mix S5 (8 SD 16 BB), the compressive strength of M 30 grade of concrete decreases from 43.85 N/sq. mm (For Controlled Mix) to 31.94 N/sq. mm.
  • For the optimum mix S5, the weight reduction up to 10.68% and 1.55% reduction in production cost per cubic meter of concrete.
  • As the replacement proportion of sawdust and brick ballast increases in concrete then slump value of the mixes gradually decreases and workability also decreases. At the optimum replacement proportion i.e. S5 (8 SD 16 BB), the slump value decreases from 58mm (For Controlled Mix) to 40 mm.
  • As the replacement proportion of sawdust and brick ballast increases in concrete then compacting factor value of the mixes gradually decreases and workability is also decreases. At the optimum replacement proportion i.e. S5 (8 SD 16 BB), the compacting factor value decreases from 0.915 (For Conventional concrete) to 0.75.
  • This sawdust and brick ballast concrete can be used in the production of non load bearing precast concrete units, flooring and pavement concrete, hollow blocks and flooring tiles.
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