International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395 -0056
Volume: 04 Issue: 01 | Jan -2017
p-ISSN: 2395-0072
www.irjet.net
EXPERIMENTAL INVESTIGATION OF SELF CURING CONCRETE M. POOVIZHISELVI1, D.KARTHIK2 1.
Assistant Professor, Department of Civil Engineering, Tamilnadu College of Engineering, Coimbatore, Tamil Nadu, poovizhicivil@gmail.com
2.
Assistant Professor, Department of Civil Engineering, KPR Institute of Engineering and Technology, Coimbatore, Tamil Nadu, karthikkdevaraj@gmail.com
----------------------------------------------------------******---------------------------------------------------------
ABSTRACT - Concrete is most widely used
hydration of cement and reduced self-desiccation. The ACI-308 Code states that “internal curing refers to the process by which the hydration of cement occurs because of the availability of additional internal water that is not part of the mixing water”. The additional internal water is typically supplied by using relatively small amounts of saturated, light weight, Polyethylene Glycol, super absorbent polymer particles in the concrete.
construction material due to its good compressive strength and durability. Concrete can be cured by water curing and by self curing agent. Plain concrete needs congenial atmosphere by providing moisture for a minimum period of 28 days for good hydration and to attain desired strength. Self curing concrete is the one which can cure itself by retaining its moisture content. In the present study, the affect of admixture (PEG 400) on compressive strength, split tensile strength, flexural strength and durability test by varying the percentage of Polyethylene Glycol (PEG) by weight of cement from 0% to 2% were studied for M20 and M30 mixes. Super plasticizers are water reducers which are capable of reducing water content by about 30 percent. It was also found that 1% of PEG 400 by weight of cement was optimum for M20, while 0.5 % was optimum for M30 grade concretes for achieving maximum strength without compromising workability.
1.2 Polyethylene Glycol
Polyethylene glycol is also known as polyethylene oxide (PEO) or polyoxyethylene (POE), depending on its molecular weight. The structure of PEG is commonly expressed as H(OCH2CH2)n OH, where n is the average number of repeating oxyethylene groups typically from 4 to about 180. One common feature of PEG appears to be the water-soluble nature. Polyethylene glycol is non-toxic, odourless, neutral, lubricating, non-volatile and nonirritating and is used in a variety of pharmaceuticals.
2. EXPERIMENTAL INVESTIGATIONS 2.1 Materials used: Cement: Portland Pozzolana Cement (PPC-53 grade) conforming to IS: 8112-198986. The specific gravity of cement is 3.15 Fine aggregate: Locally available river sand conforming to Zone II of IS: 383- 19707 was used as fine aggregate with specific gravity 2.89 Coarse aggregate: 20mm size crushed granite stone obtained from the local quarry with specific gravity 2.69 Water: Potable tap water available in laboratory with pH value of 7.0± 1 Super plasticizer: Sulphonated naphthalene formaldehyde condensate type, CONPLAST SP430. Polyethylene Glycol-400: Polyethylene glycol is a condensation polymer of ethylene oxide and water with the general formula H(OCH2CH2)n OH, where n is the average number of repeating oxyethylene groups typically from 4 to about 180.
Key words: Self curing, Polyethylene Glycol, Super plasticizers, compressive strength, split tensile strength, flexural strength
1. INTRODUCTION 1.1 Self Curing Proper curing of concrete structures is important to meet performance and durability requirements. In conventional curing this is achieved by external curing applied after mixing, placing and finishing. Self-curing or internal curing is a technique that can be used to provide additional moisture in concrete for more effective
© 2017, IRJET
|
Impact Factor value: 4.45
|
ISO 9001:2008 Certified Journal
|
Page 298