International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 07 | July -2017
p-ISSN: 2395-0072
www.irjet.net
EFFECT OF SUPER ABSORBANT POLYMER IN CONCRETE Mr. Autade pankaj1, Mr. Anbhule Sachin2 Assistant professor, Department of Civil Engineering, Dr.V.V.P, College of Engineering, Ahmednagar, India 2 PG Scholar, Department of Civil Engineering,, Dr.V.V.P, College of Engineering, Ahmednagar, India. ---------------------------------------------------------------------***--------------------------------------------------------------------1
Abstract - Concrete is the most widely consumed material
in the world after water. The main ingredients of concrete are cement, sand, aggregate & water in specific proportion. Water is an essential ingredient in the mixing curing & hardening of concrete due to insufficient curing concrete may shrink, swell & possibly crack. But now the days we need to save the water and find some methods to reduce the use of water. As we know the water requirement for concrete mail for curing is very high. So reduce the use of water SAP are the efficiently use in concrete. SAP (Super Absorbent Polymer) is a polymeric material that has the ability to absorb a large amount of liquid from the surrounding & retain within their structure. Light weight aggregate was previously the only material used as an internal curing agent but there are some major problems regarding the strength & elastic modulus of concrete. The SAP is replacing the light weight aggregate & ensures very efficient internal water curing agent in concrete. By using SAP admixture in concrete it will prove to have many positive effect on the property of concrete in both stages fresh concrete & harden concrete by making M30 grade of concrete. The dosage of SAP varies from 0.15 to 0.60 % at an interval of 0.15 % is applying & casting cube of concrete containing SAP for compression test, cylinder of for conducting split tension test and Beam for conducting Flexural Strength on concrete and comparing its results with conventional concrete. Also NDT test of Ultrasonic Pulse Velocity is use to determine quality and impermeability of concrete for 28 days. An experimental result shows that the addition of SAP upto 0.30% together with the concrete improves the compressive, Flexural and Tensile Strength corresponding to the Normal Plain cement Concrete. But after for 0.45 and 0.60% of SAP reduces the Strength. Key Words: 1) Super Absorbent polymer 2) Compressive strength, 3) flexural strength, 4) split tensile strength
1. INTRODUCTION In the last few decades great advance in concrete technology have arisen to a large extent out of the development and use of new chemical additive which although added to concrete in very small quantities can dramatically improve crucial properties of concrete in its fresh and harden state. One prominent example is the use super plasticizers. When super plasticizers are used with other appropriate ingredients they enable the © 2017, IRJET
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development of new type of concrete like self-compacting concrete or ultra-high performance concrete. Water is an essential ingredient in the mixing, curing, and hardening of concrete. Its exchange with the surroundings causes hardened concrete to shrink, swell, and possibly crack. The moisture evaporates from the concrete surface due to this crack are form are known as shrinkage crack. The autogenously deformation of concrete is defined as the unrestrained, bulk deformation that occurs when concrete is kept sealed and at a constant temperature. When the autogenous deformation is a contraction, it may be referred to as autogenous shrinkage. Obviously, control of water is important to concrete. By using SAP(Super Absorbent Polymer) as new component for the production of concrete materials makes available a number of new possibilities with respect to water control and ,as a result to the control over the rheological properties of fresh concrete, in addition water absorption and water release in either fresh or harder concrete. Well control and take release of water can be fostered by the specific design of SAP material to particular practical need. SAP absorbs water upto 5000 times to their own weight. SAPs belong to the group of socalled “smart materials” means the materials that, in a controlled way, significantly change their properties in response to an external stimulus. When SAPs are exposed to water, they swell, and when subsequently subjected to drying, they reversibly shrink. These key properties can actively be used in relation to concrete. SAP can ensure very efficient internal water curing, Internal water curing has been used for decades to promote hydration of cement and to control the shrinkage of concrete during hardening. When SAP is added in the dry concrete then they absorb and store much more water than their own weight, within a short time. During the hydration process, the saturated SAPs supply the surrounding cement matrix with additional water. When dried out, the air filled pores of SAP (about 100 to 600 µm diameter) remain, acting similarly as pores generated by air-entraining agents. Besides a strong reduction of autogenous shrinkage and delayed drying shrinkage, the SAP addition can enhance the durability of concrete.
1.1 OBJECTIVES OF INVESTIGATION Conventional concrete by using Super Absorbent Polymer in concrete by ranging from 0.15 to 0.60% with an increment of 0.15%. The main objective of this ISO 9001:2008 Certified Journal
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