A Study on Partial Replacement of Coarse Aggregate by Plastic Waste and Cement by Saw Dust Ash in Standard Grade Concrete

Port land cement and coarse aggregate as an ingredient in concrete is one of the main construction material widely used especially in developing countries. In the present study the recycled plastics were used to prepare the coarse aggregates there by providing a sustainable option to deal with the plastic waste. There are many recycling plants across the world but as plastics are recycled they lose their strength with the number of recycling. So these plastic will end up as earth fill. If it is utilized to prepare aggregates for concrete, it will be a boon to the construction industries. Most of the failures in concrete structures occur due to the failure of concrete by crushing of aggregates. Plastic waste which has low crushing value will not be crushed as easily as stone aggregate. These aggregates are also lighter in waste compared to stone aggregates. Since a complete substitution for NCA was not found feasible, a partial substitution with various percentage of PCA was done. We are consequently using plastic waste instead of land fill. By the reutilization of plastic waste we can protect the environment from the land fill of plastic garbage. Materials such as sawdust ash can replaced and reduce the utilization of port land cement. It is a natural waste & it is a wood waste and cheap product. In wood industries such as timber and furniture and saw mills the large amount of sawdust is always found as waste some amount of sawdust is re-utilized in industries which generates sawdust ash. And delivered to landfills for disposal. Using the sawdust ash in concrete is an interesting possibility for economy on waste disposal sites and conservation of natural resources. The study examines the possibility of using sawdust ash as replacement in cement for a new concrete.

Cement is the one of the binding materials in this project. 53 grade Ordinary Portland Cement conforming to IS: 8112-1989.

► Setting Time. ► Soundness. ► Fineness.

The sawdust were procured from sawmills and sun dried for 3 days. Dried sawdust was burned in open air, kept for cooling down, & grinded for fineness.

Natural river sand was used as fine aggregate. The properties of sand were determined by conducting tests as per IS: 383-1970(Part-3).

Plastic waste is collected from the disposal area were sorted to get the superior one. These were crushed into small fraction and washed to remove the foreign particles. Then they are sieved to get 20mm size plastic aggregate.

This chapter describes the experimental work. First, the material, mix proportions, manufacturing and curing of the specimen are explained. This is then followed by description of type of specimen used, test parameters, and test procedures. Development of the making plastic waste as coarse aggregate, sawdust ash as cement in concrete.

In this mix design we are used only crushed plastic. To achieve the objectives of the investigation the experimental program was planned to cast around 30 cubes with different percentages of plastic waste & sawdust ash. 3.1.1 Mix design The concrete mix design was proposed by using standard for control concrete. The grade was M25. The mix proportion of materials is 1:1:2. The mix proportions with different materials are listed below

The plastic waste and sawdust ash concrete is manufactured by as similar to the classic concrete. Initially the dry materials cement, aggregate, & sand are mixed. The liquid component of the mixture was then added to the dry materials and mixing continued for further about 3-6 minutes to manufacture the fresh concrete. The fresh concrete was cast into the moulds immediately after mixing, in three layers for cube specimens. For compaction of the specimens each layer was given 60-70 manual strokes using a tapping rod, and then vibrated for 12-15 seconds on a vibrating table. Before the fresh concrete was cast into the moulds, the slump and compaction factor was observed. The observed values are listed below.

After completing of casting process wait for 24 hours and open the moulds, take the blocks and dry it for 1-2 hours. Then after take Portable water free from impurities and salt used for curing the concrete blocks for 28 days.

An intensive experimental program is performed to study the effect of internal curing on different types of concrete properties 1. Fresh properties (slump, compaction factor) 2. Mechanical properties like compressive strength and tensile strength The cubes were tested under 200 tons compression testing machine to study the compressive strength of the cubes.

At the time of testing, each specimen must keep in compressive testing machine. The maximum load at breakage of concrete block has been observed. From the observed values the compressive strength has been calculated by using formula

Size of the test specimen is 150mm*150mm*150mm

Tensile strength is an important property of concrete because concrete structures are highly vulnerable to tensile cracking due to the various kinds of effect and applied loading itself, however tensile strength

Ratio for special concrete compressive strength and tensile strength of concrete listed below.

• This study intended to find the effective waste to re-utilize the hard plastic as coarse aggregate and saw dust ash as cement in concrete. • Concrete become less workable as the SDA percentage increases i.e., more water is required to make the mix more workable. It means that SDA concrete has higher water demand. • By adding of plastic to the concrete the density of concrete will decreases. • From the above investigation we have concluded that 10% of SDA and 5% of PCA we can replace in concrete and utilize the benefits. The compressive strength at 7,14,28 days are 16.75 N/mm2, 21.24 N/mm2, 23.377 N/mm2 and tensile strength 2.865 N/mm2, 3.226 N/mm2, 3.384 N/mm2.

A. A. Raheem, B. S. Olasunkanmi, C.S. Folorunso (2015). ―Saw Dust Ash as Partial Replacement for Cement in Concrete‖ C. Marthong (2012). ―Saw Dust Ash (SDA) as Partial Replacement of Cement‖, IJERA, ISSN: 2248-9622, Vol. 2, Issue4, pp.1980-1985. I. Sudheer, K. Priyanka, MD. Younus Mohiuddin, M.A Haleem (2016). ―Experimental Study on Partial Replacement of Coarse Aggregate by Recycled Plastic and Cement by Glass Powder in Concrete‖, Journal of Advances in Science and Technology, Vol. 10, Issue No.21, ISSN 2230-9659. Obilade, I. O. (2014). ―Use of Saw Dust Ash as Partial Replacement for Cement in Concrete‖ ISSN (Online): 2319-6734, ISSN (Print): 2319-6726, Vol.3 Issue 8, pp. 36-40. Praveen Mathew, Shibi Varghese, Thomas Paul, Eldo Varghese (2013). ―Recycled Plastics as Coarse Aggregate for Structural Concrete‖, IJIRSET, Vol.2, issue 3, ISSN: 2319-8753. Shetty M.S. (2010). Chand S. & Company Ltd. Publication, 6th Edition, New Delhi, ISBN 81-219-0003-4, ―Text Book of Concrete Technology‖. T Subramani, V. K. Pugal (2015). ―Experimental study on Plastic Waste as a Coarse

PG Student Structural Engineering, Sindhura College of Engineering & Tech, Ramagundam, Kaimnagar