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Partial Replacement of Fine Aggregate with Sawdust in Concrete By Riyaz Pasha

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Partial replacement of fine aggregate with sawdust in concrete In the saw dust replaced concrete compressive strength at 28 days falls within the characteristic strength of plain concrete. Concrete is most widely used as a construction material in day- to-day life and it also has abundantly all over today. Concrete is the best material of choice of where strength, durability, ductility, tensile and absorption resistance are required. In order to minimize the cost of the construction material in day-to-day life and to utilize the natural source materials such as saw dust, rice husk, egg shell, coir are used. Saw dust is the waste product which is available huge in quantity and which can be used as substitute of fine aggregate. In the last decade, construction industry has been conducting research on the utilization of waste product in concrete. Each waste product has its own specific effect on properties of fresh and hardened concrete. Conservation of natural resources and presentation of environment is the essence of any development. The problem arising from continuous technological and industrial development is the disposal of waste material. If some of the waste material are found suitable in concrete making not only cost of construction can be cut down and also safe disposal of waste material can be achieved .The use of waste product in concrete not only makes it economical but also solves some of the disposal problems 1.1 Specific Introduction Concrete is an artificial material in which the aggregates both fine and coarse are bonded together by the cement when mixed with water. The concrete has become so popular and indispensable because of its inherent, concrete brought a revolution in applications of concrete. Concrete has unlimited opportunities for innovative applications, design and construction techniques. Its great versatility and relative economy in filling wide range of needs has made it is very competitive building material Saw dust (or wood dust in industrial terms) is a by-product or waste produced in work working operations. These may include sawing, milling, routing, drilling and sanding. It consists of fine wood particles and shows properties of moisture holding which properties can be helped to use this sawdust concrete as a self-curing concrete. It has been proven that in a concrete mixture it doesn’t compromise the performance of the mixture and acts just like the traditional alternative. Concrete is the most widely used construction material all over the world .with innovations in science and technology in construction industry, the scope of concrete as a structural material has widened. Concrete is strong compression but it is weak in tension and flexure, The utilization of concrete is increasing at a higher rate due to development in infrastructure and construction activities all around the world. River sand has been the most popular choice for the fine aggregate component of concrete in the past, but over use of the material has led to environmental concerns, Attempts have also been made to reduce the cost of the total Attempts Civil Department BITS college 2019 Page 2

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Partial replacement of fine aggregate with sawdust in concrete have also been made to reduce the cost of the total construction cost by investigating and ascertaining the usefulness of sawdust. Generation of wood wastes. Thus, this research investigates the potential use of wood sawdust wastes to produce a low-cost and lightweight composite for construction and engineering purpose 1.3 Objectives of the study  To prepare light weight saw dust concrete of nearly equal advantages like conventional concrete.  To prepare economical concrete.  Good disposal of waste (Saw dust).  To find the strength of saw dust replaced concrete.  To identify the optimum usage of saw dust in concrete.  M25 Grade of concrete is chosen for the following investigation  Use of sawdust by sand replacement in normal concrete for real time projects thereby reducing the overall cost of construction. Civil Department BITS college 2019 Page 3

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Partial replacement of fine aggregate with sawdust in concrete CHAPTER- 2 LITERATURE REVIEW 2.1 Introduction The expenditure on traditional materials used in construction is continued to increase as the major percentage of the population continues to fall below the poverty line. Hence, several research persons are working on to use alternative materials in place of normal traditional materials to bring down the expenditure to be spent on building materials by using material, which is available in surroundings in construction works. Now a day’s ecologists are facing a big problem of disposing waste substance produced due to the cyclic production of wastes from various companies and agriculture. One of the solutions found by research persons is to use the waste substances as a material used to fill in concrete production, by which both ecologist and structural engineer gets a solution in disposal of waste and increase of the performance of concrete to meet the structural needs . By using waste materials possessing pozzolanic characteristics gives as a advantageous step made by the research persons as it develops more strength and reduces the use of cement as we replaces it with substances having pozzolanic activities by which we can reduce the investment on structures and gets economical benefits and ecological advantage by reducing the disposal problem. Joy et al. [1] they checked the 28 days compressive strength, flexural strength and splitting tensile strength at various mix proportions. They cast specified number of cubes, cylinder and beams by replacing fine aggregate with sawdust by 15%, 20%, 25% & 30% and to compare their property with standard mix (M25).Based on the investigation on sawdust, following conclusions were made i.e. in 28 days compressive strength and splitting tensile strength of the concrete is not increased to large extent but it almost matches with the compressive and splitting tensile strength of nominal mix concrete. The compressive strength obtained for the replacement of fine aggregate with 25% sawdust was proved to be the optimum mix to get M25 grade of concrete. But the flexural strength gradually increases as sawdust content increases. The fiber content in sawdust is very high and is responsible for the increase of strength. Weight of the sawdust concrete was reduced as compared with normal concrete and also become more economical. As a result of this experiment it was observed that the concrete containing sawdust get compacted more efficiently than the normal concrete. Dry porous sawdust could absorb sufficient amount of water that could be an effective mean of internal curing and absorb the excess water in the mix and provide the water required for the hydration of the cement. Civil Department BITS college 2019 Page 4

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Partial replacement of fine aggregate with sawdust in concrete Abdullahi et al. [2] they checked the compressive strength of concrete and analyse its effect on theconstruction cost. They casted (150x150x150)mm cube & evaluated the compressive strength of concrete at 7,14,21and 28 days by replacing fine aggregate from 0% to 50% (in percentage gap of 10). Based on the investigation following conclusions were made i.e. Sawdust as an air-entraining agent has no appreciable positive effect on the compressive strength of concrete. Variation in the compressive strength results is traceable to the fact that it is difficult to obtain sawdust which is not a mixture of several species. A possibility exists for could be attributed to the fact that sawdust contains some substances which the partial replacement of sand with sawdust in the production of Lightweight concrete. Optimum replacement of sand with sawdust has been found to be 10%. Beyond this limit, the concrete produced did not meet code requirements. As a result of this experiment it was observed that as the percentage sawdust content increased in the mix the compressive strength decreased. The low values of the compressive strength of the concrete used in this investigation are injurious to the cement. These substances actually inhibit the hydration of cement and hence the development of strength. Suji.D et al. [3] they determined the optimum quantity of river sand to be replaced by Quarry dust and saw dust and to obtain maximum results and compared the characteristic strength of normal concrete and concrete with Quarry dust and Saw dust. In this experimental study, the test was conducted for M30 mix containing Quarry dust ranging from 0, 10%, 20%,30%,40% combined with Saw dust ranging from 0,5%,10%,15% &20% remaining percentage river sand is used. Based on the experimental study following conclusions were made i.e. The compressive strength of quarry dust and saw dust up to 30% and 15% respectively is almost similar to that of control mix. Split tensile strength of quarry dust and saw dust up to 30% and 15% respectively is almost similar to that of control mix. Two-point loading test result shows that the first crack load is almost same for both control mix and quarry dust and saw dust concrete. As a result of this experiment Quarry dust and saw dust content of 30% and 15% by weight has shown the best results. Thus indicates the possibility of using quarry dust and saw dust as a partial replacement of fine aggregate up to this level. The weight can be reduced up to 20%. Kumar et al. [4] they carried out an experimental study to compare the cost of sand used concrete block and saw dust used concrete block and also compared the reduction in weight of two blocks. In this experiment, they prepared 6 test specimens of control concrete & 10%, 15%, & 20% fine aggregate replaced by saw dust by volume each. Based on the study carried out on the strength behavior of saw dust the following conclusions are drawn i.e.at the initial ages, with the increase in the percentage replacement of saw dust, the strength as well as compressive strength increases. Moreover with the use of saw dust, Civil Department BITS college 2019 Page 5

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