Experimental Investigation of Self Curing Concrete using Polyethylene Glycol

The aim of this investigation is to study the strength and durability properties of concrete using water soluble polyethylene glycol as self curing agent. The function of self curing agent is to reduce the water evaporation from concrete. The use of self curing admixtures is very important from the point of view that water resources are getting valuable every day. Polyethylene glycol in 1%, 1.5% and 2% place using concrete (i.e; each 1m of concrete required about 3m of water for construction. Most of which is for curing Concrete are made up of M20 grade mix and tested for its compressive strength test, split tensile test and flexure test up to 7, 14 & 28 days of age and compared with conventional concrete. Key Word: Self-curing concrete, Self-curing agent, Polyethylene Glycol (PEG-400), Water retention, Compressive strength, Workability, Saving of water. 1.INTRODUCTION Concrete has been the most versatile material used in the construction industry. It is the second most consumed material in the world due to its high compressive strength and durability, which is the mixture of cement, fine aggregate, coarse aggregate and water needs curing to achieve required strength. When cement is added to water, hydration reaction takes place and this hydration process is necessary for hardening of concrete. Curing is the process to avoid moisture content deficiency from concrete during the hydration process. Effect from curing has a strong influence on the properties of hardened concrete such as it will increase the durability, strength, volume stability, abrasion resistance, impermeability and resistance to freezing and thawing. If water is not provided then shrinkage of concrete takes place which results in cracking. Furthermore, unexpected shrinkage and temperature cracks can reduce the strength, durability, and serviceability of the concrete. Practically good curing of concrete is not achievable in many cases due to unavailability of suitable quality of water and many other practical difficulties. During the last two decades, concrete technology has been undergoing rapid Improvements. With conventional ingredients it is possible to design reasonably good fast track concrete mixture using admixtures. Internally cured concrete can be achieved by adding Self Curing Agents. 2. OBJECTIVE AND SCOPE ➢ The main objective of our project is to reduce the usage of H2 o in concrete at that same time. ➢ It will easy to workability to use then it is also increase the strength. 3.METHODOLOGY • Selection of materials • Testing of materials • Concrete mix design • Testing of properties of fresh concrete(slum cone test) • Preparation of test specimen • Testing of properties of hardened concrete test(compressive strength, tensile stress) • Conclusion International Journal of Engineering Research & Technology (IJERT) ISSN: 2278-0181 http://www.ijert.org IJERTV9IS060418 (This work is licensed under a Creative Commons Attribution 4.0 International License.) Published by : www.ijert.org Vol. 9 Issue 06, June-2020


1.INTRODUCTION
Concrete has been the most versatile material used in the construction industry. It is the second most consumed material in the world due to its high compressive strength and durability, which is the mixture of cement, fine aggregate, coarse aggregate and water needs curing to achieve required strength. When cement is added to water, hydration reaction takes place and this hydration process is necessary for hardening of concrete.
Curing is the process to avoid moisture content deficiency from concrete during the hydration process. Effect from curing has a strong influence on the properties of hardened concrete such as it will increase the durability, strength, volume stability, abrasion resistance, impermeability and resistance to freezing and thawing. If water is not provided then shrinkage of concrete takes place which results in cracking. Furthermore, unexpected shrinkage and temperature cracks can reduce the strength, durability, and serviceability of the concrete.
Practically good curing of concrete is not achievable in many cases due to unavailability of suitable quality of water and many other practical difficulties. During the last two decades, concrete technology has been undergoing rapid Improvements. With conventional ingredients it is possible to design reasonably good fast track concrete mixture using admixtures. Internally cured concrete can be achieved by adding Self Curing Agents.

OBJECTIVE AND SCOPE ➢
The main objective of our project is to reduce the usage of H2 o in concrete at that same time.
➢ It will easy to workability to use then it is also increase the strength.
3.METHODOLOGY The size of the aggregate, particle shape, color, surface texture, density, impurity all of which have an influence on the durability of concrete should conform to IS:2386 (part-III). Table 3 Physical properties of coarse aggregate

POLYETHYLENE GLYCOL
Polyethylene glycol is a condensation polymer of ethylene oxide and water with the general formula H(OCH 2CH 2)nOH, where n is the average number of repeating oxyethylene groups typically from 4 to about 180. The abbreviation (PEG) is termed in combination with a numeric suffix which indicates the average molecular weights. One common feature of PEG appears to be the water-soluble nature. Polyethylene glycol is non-toxic, odorless, neutral, lubricating, non-volatile and non-irritating and is used in a variety of pharmaceuticals Table 4. physical properties of polyethylene glycol.

The mix design of concrete is done based on
properties of cement, Fine aggregate, coarse aggregate, Water. The mix proportion for concrete is obtained as 1:1.5:3 and water cement ratio as 0.45.

COMPRESSIVE STRENGTH
The cube specimens were tested on compression testing machine of capacity 3000KN.The bearing surface of machine was wiped off clean and sand or other material removed from the surface of the specimen. The specimen was placed in machine in such a manner that the load was applied to opposite sides of the cubes as casted that is, not top and bottom. The axis of the specimen was carefully aligned at the center of loading frame. The load applied was increased continuously at a constant rate until the resistance of the specimen to the increasing load breaks down and no longer can be sustained. The maximum load applied on specimen was recorded.

Fc = P/A
where, P is load & A is area. Following graph shows the variation in compressive strength with addition of PEG.

SPLIT TENSILE STRENGTH
The cylinder specimens were tested on compression testing machine of capacity 3000KN.The bearing surface of machine was wiped off clean and looses other sand or other material removed from the surface of the specimen. The load applied was increased continuously at a constant rate until the resistance of the specimen to the increasing load breaks down and no longer can be sustained. The maximum load applied on specimen was recorded . fsplit =2 P/πD, where P=load, D= diameter of cylinder, L=length of the cylinder. Following graph shows the variation of split tensile strength with addition of PEG.

FLEXURAL STREGTH
The beam specimens were tested on universal testing machine for two-point loading to create a pure bending. The bearing surface of machine was wiped off clean and sand or other material is removed from the surface of the specimen. The two point bending load applied was increased continuously at a constant rate until the specimen breaks down and no longer can be sustained. The maximum load applied on specimen was recorded.

CONCLUSION
The optimum dosage of PEG400 for maximum strengths (compressive, tensile and modulus of rupture) was found to be 1.5% As percentage of PEG400 gets increased slump as well as compaction factor also gets increased.
Strength of self-curing concrete is relatively high when compared with conventional concrete.
Self-curing concrete is the viable answer to many problems faced due to lack of proper curing.