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EXPERIMENTAL STUDY ON STRENGTH PROPERTIES OF SELF COMPACTING CONCRETE

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International Journal of Civil Engineering and Technology (IJCIET)
Volume 10, Issue 3, March 2019, pp. 524-529. Article ID: IJCIET_10_03_053
Available online at http://www.iaeme.com/ijciet/issues.asp?JType=IJCIET&VType=10&IType=3
ISSN Print: 0976-6308 and ISSN Online: 0976-6316
© IAEME Publication
Scopus Indexed
EXPERIMENTAL STUDY ON STRENGTH
PROPERTIES OF SELF COMPACTING
CONCRETE
*Arunya. A, Thendral.S, Chitra.R
Assistant Professor, Department of Civil Engineering, BIST, BIHER, Bharath University
Dr.S.J. Mohan
Professor, Department of Civil Engineering, BIST, BIHER, Bharath University, India.
*Corresponding Author
ABSTRACT
An extra ordinary cement which streams and solidifies under its own weight in
this manner disposes of the issues of putting cement in troublesome conditions is
known as Self Compacting Concrete. It even diminishes the time in putting vast
segments and in the meantime giving high quality and better toughness attributes
when contrasted with the Normal Concrete. The different parts of SCC including the
materials and blend plan, diverse test techniques, for example, V-channel test, L-Box
test and so on., are talked about in this paper.
Keywords: SCC, Special Concrete, Properties, Super plasticizer.
Cite this Article: Arunya. A, Thendral. S, Chitra. R and Dr. S. J. Mohan,
Experimental Study on Strength Properties of Self Compacting Concrete,
International Journal of Civil Engineering and Technology, 10(3), 2019, pp. 524-529.
http://www.iaeme.com/IJCIET/issues.asp?JType=IJCIET&VType=10&IType=3
1. INTRODUCTION
The cementing works prompted the advancement of another assortment of cement called selfcompacting concrete for which was source of primarily growth due the work of Okamura, it
turned out to be temperate, strong and named as elite cement in light of its quality properties.
The upsides of SCC are forming into more attractive everywhere throughout the world which
incorporates quicker development, lessens labor, better completes, less demanding position,
better strength, more slender solid areas, lesser commotion levels, no vibration, more secure
workplace. Development of self-compacting concrete started at Japan. The utilization of
admixtures like SP were the fundamental made it rising relentlessly throughout the years as a
result of their favorable circumstances. This gave an inclination to numerous researchers and
associations to complete examination on proportions of SCC.
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Experimental Study on Strength Properties of Self Compacting Concrete
The duration of concrete building depends on the durable properties of concrete
structures. Durability is ultimately achieved by proper compaction which requires skilled
labors. The main advantage of using self-compacting concrete is it compacts in every corner
of formwork thoroughly throughout by itself.
2. MATERIALS
The materials incorporate more powder substance and less coarse total notwithstanding high
range water reducers (HRWR, super plasticizers) in a bigger amount for delivering selfcompacting concrete contrasted with that of the common typical concrete as SCC. Also, a
thickness adjusting operators (VMA) in little measurements is utilized.
2.1. Aggregates
Aggregates play an important role in SCC as per its shape and gradation. Many research
works has been carried out to prepare SCC by using locally available aggregates materials.
Workability is achieved with lower cement content and rounded aggregates than that of
angular aggregates. But still flowable concrete are produced using angular aggregates as
suggested by O‟Flannery.
Poor degree of totals is likewise other reasons for the flowability of SCC and utilizing
fillers.
2.2. Super Plasticizers
To accomplish the alluring stream at low water substance High range water lessening
admixture assumes an essential part. As an aftereffect of numerous exploration works
utilizing diverse sorts of Superplasticizers it is reasoned that the superplasticizers taking into
account "steric impediment" acquire a minimum measurement than which in view of
"electrostatic aversion".
2.3. Viscosity modifying agents (VMA)
The utilization of VMA aides in diminishing draining and at last enhances the dependability
of the solid blend. A powerful VMA keeps up the required dependability by decreasing the
powder necessity. Furthermore, SCC quite often fuses admixture, to enhance the
deformations and soundness of cement. The VMA's are being used subsequent to quite a
while it contains polysaccharides as dynamic fixing which controls the thickness.
Super plasticizers dose might encourage out bringing about loss of droop along these
lines the similarity between the concrete and super plasticizers is a critical issue to be
considered.
3. MIXTURE PROPORTIONING METHODS
Blending configuration of this type of concrete have imperviousness to isolation, without
blockage. Utilizing VMA it is presently conceivable to lessen the water content giving a high
droop. The different approaches to create SCC can be extensively characterized into 4
classifications, in particular (i) Empirical strategies (ii) Discrete models (iii) Particle pressing
models, and (iv) Statistical techniques.
3.1. Empirical methods
Okamura and Ozawa proposed a technique in which 50 % of the strong volume is taken up
by coarse total (CA), while 40 % of the mortar volume is a fine total (FA). Stream tests on
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Arunya. A, Thendral. S, Chitra. R and Dr. S. J. Mohan
mortar is then used to know the water to powder proportion and after that modification are
finished with coarse and fine totals substance. Numerous specialists now utilize this
technique as a start up in their examinations.
Edamatsu et al have adjusted this technique in which the proportion of CA is kept at 0.5
yet the substance of FA is settled utilizing V-channel test and the measurements of water to
powder proportion and superplasticizers is then controlled by stream and pipe tests. EFNARC
prescribes the same system as utilized by Okamura however as opposed to settling the CA
substance to 0.5, a higher measure of CA for adjusted totals is permitted (0.6) and the sand is
shifted between 0.4 to 0.5.
3.2. Discrete models
In this model, the greater size totals go about as the base edge and the littler size particles fills
the voids. The left-over voids are loaded with the better molecule and the chain goes ahead in
diminishing request.
Sedran and de Larrard utilized this model to deliver SCC by totally killing VMA and
utilized the outcomes from rheology estimations on crisp SCC, filling capacity (L-box test),
and imperviousness to isolation. By utilizing the virtual products, the blend extent of SCC
was then discovered upgrading the blends with respect to the properties.
3.3. Statistical Methods
Measurable strategies have numerous points of interest which incorporate doing least number
of trials. Khayat proposed an extent technique to create SCC utilizing diverse parameters, for
example, bond content, w/c proportion, Superplasticizers and VMA fixations, and measure of
coarse total at five divergent levels and measured droop, thickness, V-pipe time, and filling
capacity. This technique gives the interrelationships among the elements for execution
improvement
4. METHODS OF TESTING SCC
In crisp state SCC is described by its capacities to fill, pass and its solidness and not so in the
event of routine cement and subsequently there are couple of unique tests to gauge the
execution of fixings.
4.1. Droop Flow Test
This is by and large embraced test to gauge the flowability of SCC. The test methodology is
performed similarly as that for traditional cement however as opposed to measuring vertical
droop remove, the mean spread of cement on a level plane is noted.
4.2. J-Ring Test
In this test a ring of strengthening bar is fitted around the base of a standard droop cone. The
droop stream is then measured with and without J, and the distinction is computed. Amid the
test, the Visual Blocking Index is utilized to rate the isolation of the blend.
4.3. L-Box Test
This test is utilized to assess the passing capacity of SCC in which the solid is put inside the
testing mechanical assembly and a flame broil went with the testing device. This recreates
fortification and the stature of cement vertically toward the end of the flat parcel of the
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Experimental Study on Strength Properties of Self Compacting Concrete
mechanical assembly are measured. The proportion of these two is then used to decide the
passing capacity.
4.4. V-Funnel Test
Using the V-pipe test, the thickness and the capacity to go through opening at base can be
gotten. It is measured when taken to purge the channel by the blend. Various components
alongside thickness, droop stream, size conveyance, sum and state of coarse total influences
the V-pipe stream time.
5. HARDENED PROPERTIES OF SCC
The higher flowability and a higher proportion of fine materials brings out the greater
difference in the SCC from Conventional concrete.
5.1. Uniformity
Most of the examination works has reported that the execution of SCC is not all that unique
in relation to a completely compacted traditional cement. It was likewise watched that the insitu qualities from the centers of dividers and segments were comparable for the SCC and
ordinary blends. Zhu et al. concentrated further on this study by taking segments and pillars
on the consistency.
5.2. Creep and shrinkage of SCC
The hydrated bond glue for the most part represents the killjoy and shrinkage of cement and
due to more glue substance (flyash), SCC tend to crawl. However in a study B. Persson, the
quality, versatile modulus, jerk and shrinkage of SCC and typical cement does not vary much
aside from that the killjoy was more at the introductory times of Self compacting concrete.
6. CONCLUSION
High flowability and isolation control is accomplished chiefly by the utilization of
consistency adjusting operators alongside high-range water decreasing specialists. A superior
of SCC has cleared approach to know the elements of fines, superplasticizers, and VMA in
SCC. The similarity in these parts results in the originators a reasonable comprehension of
the strength properties of SCC incorporating stress strain qualities in its solidified condition.
Aside from couple of systems created by the scientists no particular standard IS codes are
accessible to blend outline of self-compacting concrete. Numerous establishments, RMC,
organizations are utilizing their own routines with one or different restrictions. Subsequently
steps are taken to add to this sort of solid taking into the thought every one of the viewpoints.
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