Strength comparison of selfcuring concrete and normal. Selfcured concrete is a type of concrete with a special ability to reduce autogenous shrinkage responsible for earlystage cracking. Mohanraj, rajendran m studied on self curing concrete incorporated with polyethylene glycol. The incorporation of self curing agents into concrete mixtures provides internal curing for the concrete and thus allowing a continuous hydration, which results in an improvement in the tensile strength of the concrete as shown in fig. Mohanraj rajendran m studied on selfcuring concrete incorporated with polyethylene glycol. An experimental investigation of self curing concrete norporat wt poly tyln lyol as s l urn a nt shikha tyagi m.
So it is required to cure for a minimum period of 28 days for good hydration and to achieve target strength. Such concrete should have a relatively low yield value to ensure high flow. Higher cement content andor lower watercement ratio leads to more effective results of self curing agents in concrete. Internal curing refers to the process by which the hydration of cement occurs because. In addition, using the chemical as selfcuring agent is superior to saturated leca table 3. Higher cement content andor lower watercement ratio leads to more effective results of selfcuring agents in concrete. Selfcompacting concrete applications and advantages.
For the concrete series cured in elevated temperature 50 c, reference concrete gives higher strength at early age compared with selfcuring concretes, which may be attributed to the acceleration of cement hydration, beyond that, gradual reduction of strength gain was observed up to 28 days as shown in fig. Self curing is a technique which is used to provide proper moisture contents in. There are two major methods available for internal curing of concrete. Cip 1 00 concrete in practice cip 1 dusting concrete surfaces. The characteristic of a self curing agent is to reduce the water evaporation from concrete, and therefore they grow the water retention capacity of concrete as compared to the conventionally cured concrete. An average increase in the compressive strength of 12% was found when self curing concrete of peg 400 was used in curing than the conventional curing of concrete.
Self curing concrete is the best solution to the problem faced in the desert region and faced due to lack of proper curing. This curing is performed either under atmospheric pressure or highpressure steam. Self leveler plus is a highstrength, regularsetting, cementbased, self leveling underlayment and repair mix for use over interior concrete, plywood and other approved floor surfaces. Self curing concrete is one of the special concretes in mitigating insufficient curing due to human negligence paucity of water in arid areas, inaccessibility of structures in difficult terrains and in areas where the presence of fluorides in water will badly affect the characteristics of concrete. The steam curing method is preferred where there is a need for accelerated strength gain and the concrete requires additional heat. Curing can be described as keeping the concrete moist and warm enough so that the hydration of cement can continue. Abstract the mechanical properties of concrete containing self curing agents are investigated in this paper. Guide to external curing of concrete reported by aci committee 308 aci committee reports, guides, and commentaries are intended for guidance in planning, designing, executing, and inspecting construction. Basil gnanappa3 1sun college of engineering and technology, sathyabama university, chennai, india 2sun polytechnic college, sathyabama university, chennai, india. Curing may be applied in a number of ways and the most appropriate means of curing may be dictated by the site or the construction method. In this study, two materials were selected as self curing agents with different amounts, and the addition of silica fume was studied. Self cured concrete satisfies serviceability conditions also. Curing of concrete purpose of curing curing methods.
Curing will increase the strength and decrease the permeability of hardened concrete. Chemicals to achieve selfcuring some specific watersoluble chemicals added during the mixing can reduce water evaporation from and within the set concrete, making it selfcuring. Selfcuring concrete should become available in the nottoodistant future. Compressive strength of cube and cylinder by ndt for self cured concrete is higher than that of. In 2002 li debuted a precursor concrete material that was bendable but not selfhealing. Internal curing is often also referred as self curing.
Selfcompacting concrete procedure for mix design paratibha aggarwal, rafat siddique, yogesh aggarwal, surinder m gupta concrete that can flow under its own weight through restricted sections without segregation and bleeding. The present study focuses on the impact of self curing agents such as poly ethylene glycol peg, poly vinyl alcohol pva and super. Steam curing of concrete is the method of curing the concrete elements in water vapor. A self curing concrete is provided to absorb water from atmosphere from air to achieve better hydration of cement in concrete. Selfcuring concrete with different selfcuring agents iopscience.
The self curing agents were, presoaked lightweight. Concrete cannot be subjected to dry heat to accelerate the hydration process as the presence of moisture is also an essential requisite. Self curing concrete is the one which can meet the present and future requirements of curing concrete. Pdf experimental study on the properties of selfcuring. The strength and durability of concrete depends on the curing of concrete. Selfcuring concrete is achieved by means of replacing a part of aggregate by lightweight aggregate or adding chemical admixtures. Currently, there are two major methods available for internal curing of concrete. Introducing the selfcuring concrete in construction industry ijert.
To study the strength properties of concrete made with curing compound i. Concrete research and development laboratory boral maintains a dedicated construction materials research and development facility. Self compacting concrete procedure for mix design paratibha aggarwal, rafat siddique, yogesh aggarwal, surinder m gupta concrete that can flow under its own weight through restricted sections without segregation and bleeding. The importance of selfcompacting concrete is that maintains all concretes durability and characteristics.
This study was carried out to compare among concretes without or with silica fume sf. She was concluded that the optimum dosage of peg400 for maximum compressive strength was to be 1% for. Concept of internal curing self curing it is widely acknowledged that, amongst researchers and practitioners, internal curing concepts emerged from the united states by paul klieger in 1957 2,17,21,22. A measure of the ease by which fresh concrete can be placed and compacted.
The self curing process of concrete takes place from inside to outside, thus reducing the autogenous shrinkage and self desiccation, especially for the highperformance concrete with relatively low waterbinder ratio. M25 and m40 grade of concrete are adopted for investigation. Self curing for high strength concrete ijert journal. Conventional curing involves the continuous saturation of the concrete surface with water for a specified length of time, starting as soon as the concrete is no longer susceptible to damage at ambient temperatures. This work explains the performance of self curing concrete by the application of wax based curing compound.
More elaborately, it can be described as the process of maintaining a satisfactory moisture content and a favorable temperature in concrete during the period immediately following placement, so that hydration of cement may continue until. As a result of successful and recent tests and research, have recently put external self curing in the forefront of breakthroughs of ideas of how to make better concrete what is self curing concrete. Mechanical properties of selfcuring concrete scuc sciencedirect. Methods of curing concrete curing types and techniques. Selfcuring concrete is one of the special concretes in mitigating insufficient curing due. The main components which needs to be taken care are moisture, heat and time during curing process. It solves the problem that the degree of cement hydration is lowered due to no curing or improper curing, and thus unsatisfactory properties of concrete. Curing of cement concrete is defined as the process of maintaining the moisture and temperature conditions of concrete for hydration reaction to normally so that concrete develops hardened properties over time. Proper curing is necessary to achieve desired strength and performance of concrete. May 14, 2018 the characteristic of a self curing agent is to reduce the water evaporation from concrete, and therefore they grow the water retention capacity of concrete as compared to the conventionally cured concrete. Polyethylene glycol peg is one of the chemical agents which minimizes the loss of water and also attracts moisture. If you are unable to download any of the topics mentioned below, you can mail to the admin to get the soft copy of the topic of your interest. Chemicals to achieve self curing some specific watersoluble chemicals added during the mixing can reduce water evaporation from and within the set concrete, making it self curing.
Depending upon the nature of work the cement, fine aggregate, coarse aggregate and water are mixed in specific proportions to produce plain. External self curing concrete is the one which can cure itself by retaining its moisture content within the concrete by the application of curing compounds on the surface of the concrete. Therefore, subjecting the concrete to higher temperature and maintaining the required wetness can be achieved by subjecting the concrete to steam curing. The minimum period for curing concrete to attain maximum strength is 28 days. Selfcompacting concrete with a similar water cement or cement binder ratio will usually have a slightly higher strength compared with traditional vibrated concrete, due to the lack of vibration giving an improved interface between the aggregate and hardened paste. Introducing the selfcuring concrete in construction industry. The need for adequate curing of concrete cannot be overemphasized. A concrete can made to self cure by adding curing admixtures or by the application of curing compounds. Curing of concrete is a method by which the concrete is protected against loss of moisture required for hydration and kept within the recommended temperature range. Potential materials cement of 53 grade fine aggregate.
Incorporation of silica fume into concrete mixtures enhances all physical properties. Cip 36 structural lightweight concrete cip 37 self consolidating concrete scc. Investigations on selfcompacted selfcuring concrete. Curing is also helps in mitigating thermal and plastic cracks, which can severely impact. Internal curing refers to the process by which the hydration of. The terms curing and drying are frequently used interchangeably with regard to the moisture condition of new concrete slabs. It was at this facility that special concrete mixes were developed for. In 2002 li debuted a precursor concrete material that was bendable but not self healing. Experimental investigation on selfcuring selfcompacting. Self curing concrete is achieved by means of replacing a part of aggregate by lightweight aggregate or adding chemical admixtures. The first section will delineate a brief research history of. Pdf internal curing of concrete by the use of presaturated lightweight aggregates or polyethyleneglycol is well established method of counteracting. Once cured, it provides a smooth, level surface on which to install a variety of floor coverings. Compressive, splittensile and flexural strength properties of self curing concrete mixes are evaluated and exhaustive cost analysis is made on internally and externally cured concrete for.
Excessive evaporation of water internal or external from fresh concrete should be avoided. May 09, 20 powerpoint presentations and detailed seminar reports. The chemical agent peg is used with different percentage. It solves the problem that the degree of cement hydration is lowered due to no curing or. External self curing of concrete internal self curing of concrete what is external self curing of concrete. Self curing or internal curing is a technique that can be used to provide additional moisture in concrete for more effective hydration of cement and reduced self desiccation. Conventional curing and lowpressure steam curing are two of the more common methods of curing precast concrete products. Self curing concrete scc can cure without using any external curing methods.
In this research chemical curing agent is used to produce sc. The chemicals should have abilities to reduce evaporation from solution and to improve water retention in ordinary portland cement matrix. Effect of selfcuring agents on different physical properties of concrete. Self curing concrete is one of the special concretes in mitigating insufficient curing due to human negligence paucity of water in arid areas, inaccessibility of structures in difficult terrains and in areas where the presence of fluorides in water will badly affect. Whenever there is difficulty in water curing, self curing concrete will. Pdf effect of self curing compound on strength and.
Curing is the maintenance of a satisfactory moisture content and temperature in concrete for a period of time immediately following placing and finishing so that the desired properties may develop. Concrete is said to be self cured, if it is able to retain its water content for the development of its strength. Self curing concrete sc is a concrete type that can be cured without using any external curing regimes. Immersion curing with water consists of total immersion of the hardened concrete element. Curing has a strong influence on the properties of hardened concrete. Experimental study on the properties of selfcuring concrete. Guide to external curing of concrete reported by aci committee 308 aci committee reports, guides, and commentaries are intended for guidance in planning, designing. Jonkers delft university of technology, faculty of civil engineering and geosciences, department of materials and environment microlab, delft, the netherlands a typical durabilityrelated phenomenon in many concrete constructions is crack formation. Apr 2006 data sheet curing of concrete curing is the process of controlling the. Self curing concerete in this we use some admixtures like sra shrinkage reducing admixture propylene glycol type i. Cip 10 strength of inplace concrete cip 11 curing inplace concrete cip 12 hot weather concreting cip concrete blisters cip 14 finishing concrete flatwork cip 15 chemical admixtures for concrete. Any negligence in in curing will interfere in the strength and durability of concrete.
Curing of concrete is defined as providing adequate moisture, temperature, and time to allow the concrete to achieve the desired properties for its intended use. Shikha tyagi studied on self curing concrete and had use peg400 as a self curing agent in concrete. Conventionally, curing concrete means creating conditions such that water is not lost from the surface i. Self curing concrete is one of the special concretes in mitigating insufficient curing due. From the above graph, it is clear that concrete attains 50% of its design strength when it cured for 37 days. Curing is the maintenance of a satisfactory moisture content and temperature in concrete for a period of time immediately following placing and finishing so that the desired properties may develop fig. Self curing of concrete self curing concrete is the one which can cure itself by retaining its moisture content. Any negligence in curing will interfere in the strength and durability of concrete. Self curing concrete can be practiced in pre fabrication units and in place of water scarcity as well as exposed weather condition. The optimum ratio of selfcuring agent examined in this study is 2% of the chemical agent polyethylene glycol or 10% of saturated leca. The present work deals with the performance of self curing concrete, its advantages, applications.
Internal curing of concrete by the use of presaturated lightweight aggregates or polyethyleneglycol is well established method of counteracting self desiccation and autogenous shrinkage. This paper highlights the effect of curing agent polyethylene glycol peg400 in the performance of concrete. Internal curing is often also referred as selfcuring. Lack of proper curing can badly affect the strength and durability. This method of curing satisfies all the requirements of curing, namely, promotion of hydration, elimination of shrinkage and absorption of heat of hydration. Selfcuring or internal curing is a technique that can be used to provide additional moisture in concrete for more effective hydration of cement and reduced self. Today concrete is most widely used construction material due to its good compressive strength and durability.
Any laxity in curing will badly affect the strength and durability of concrete. She added 12% of peg400 by weight of cement for m25 and m40 grade concrete. In conventional concrete curing is done by after various stages like mixing, placing and finishing. Selfcompacting concrete is a nonsegregating concrete that is placed by means of its own weight. Selfhealing of concrete a new technology for a more. Internal curing of concrete by the use of presaturated lightweight aggregates or polyethyleneglycol is well established method of counteracting selfdesiccation and autogenous shrinkage.
Selfcuring concrete is the best solution to the problem faced in the desert region and faced due to lack of proper curing. It can perform by several methods such as using lightweight aggregate or chemical agents. Super plasticizer named glenium was used to improve the workability of concrete. The aci308 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. Self curing concrete using wax based curing has an average efficiency of 84. However, the concept of internal curing is new in concrete design while porous light weight aggregates lwas have been used in. Higher cement content andor lower watercement ratio leads to more efficient performance of selfcuring agents in concrete.
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