The research paper published by IJSER journal is about STRENGTH OF CONCRETE CONTAINING DIFFERENT TYPES OF FINE AGGREGATE 1
ISSN 2229-5518
“STRENGTH OF CONCRETE CONTAINING
DIFFERENT TYPES OF FINE AGGREGATE”
Sachin Balkrishna Kandekar, Amol Jagannath Mehetre, Vijayshree A. Auti
Abstract— Common river sand is expensive due to excessive cost of transportation from natural sources. Also large -scale depletion of these sources creates environmental problems. As environmental transport ation and other constraints make the availability and use of river sand less attractive, a substitute or replacement product for concrete industry needs to be found. River sand is most commonly used fine aggregate in the production of concrete poses the problem of acute shortage in many areas. W hose continued use has started po sing se- rious problems with respect to its availability, cost and environmental impact? An attempt has also been made for strength studies on con- crete made up of grit when compared with the concrete made up of Artificial Sand and Natural Sand. Use of grit as a fine aggregate in con- crete draws serious attention of researchers and investigators.
Index Terms— Artificial Sand, depletion of sources, environmental transportation, fine aggregate, Grit, Natural Sand, replacement product.
—————————— ——————————
Currently India has taken a major initiative on develop- ing the infrastructures such as express highways, power projects and industrial structures etc. To meet the require- ments of globalization, in the construction of buildings and other structures concrete plays the rightful role and a large quantum of concrete is being utilized. River sand, which is one of the constituents used in the production of conven- tional concrete, has become highly expensive and also scarce. In the backdrop of such a bleak atmosphere, there is large demand for alternative materials from industrial waste.
The utilization of Grit which can be called as dust of quarry rock has been accepted as a building material. As a result of sustained research and developmental works un- der-taken with respect to increasing application of this in- dustrial waste. The level of utilization of Grit in the indu- strialized nations like Australia, France, Germany and UK has been reached more than 60% of its total production. The use of manufactured sand in India has not been much, when compared to some advanced countries.
This paper presents the feasibility of the usage of Grit as hundred percent substitutes for Conventional Concrete. Tests were conducted on cubes and beams to study the strengths of concrete made of Grit as a waste material, ar- tificial sand and natural sand. Studies were done for con- crete with Grit, artificial sand and compared with the Con- ventional Concrete.
————————————————
Sachin B. Kandekar, AVCOE, Sangamner, University of Pune, Maharash- tra, India, PH-+919890004028, E-mail: sbkandekar@gmail.com.
Amol J. Mehetre, AVCOE, Sangamner, University of Pune, Maharashtra, India, PH-+919860179804, E-mail: mehetreaj@rediffmail.com.
Vijayshree A. Auti, AVCOE, Sangamner, University of Pune, Maharash- tra, India, PH-+919226971973, E-mail: autiva_06@rediffmail.com.
Assessment is made on the existing mix design methods and test results of concrete produced using manufactured sand. Tests were conducted using river sand, manufactured sand and a combination of both with equal amounts of ce- ment, coarse aggregate and water and with variable amounts of admixtures. A cost comparison of concrete pro- duced using partial or full replacement of the Natural Sand with Manufactured Sand was made. The results were pre- sented in graphical form and interpretation and discussion were made on the research findings. Based on the findings conclusions are drawn and recommendations are for- warded.
TABLE 1
SEIVE ANALYSIS OF FINE AGGREGATES
After carrying this sieve analysis for Grit, Concrete Mix Design is prepared for M20 grade of concrete by initial test- ing on ingredient. The proportions are 1:1.425: 3.10. Table 2 shows the comparative compressive strength of the con- crete block tested after 28 days. Table 3 showing split ten- sile strength where as Table 4 is showing results for flexural strength of concrete.
IJSER © 2012
The research paper published by IJSER journal is about STRENGTH OF CONCRETE CONTAINING DIFFERENT TYPES OF FINE AGGREGATE 2
ISSN 2229-5518
TABLE 2
COMPARITIVE COMPRESSIVE STRENGTH
Fig. 1. Comapritive Compressive Strength
TABLE 2
COMPARITIVE COMPRESSIVE STRENGTH
TABLE3
TEST RESULT FOR BEAM STRENGTH AND DEFLECTION
Fig.2. ComapritiveGraph of Deflection, Compressive Strength and
Load
Concrete does not give adequate workability because particle shape is not spherical but cubical or flaky. This can be controlled by proper shape and gradation, use of plasti- cizers etc.
Higher water absorption removes free water also great- er surface area results in faster evaporation by which con- crete tends to set quickly. Use of retarding plasticizers, pro- tecting the green concrete from drying can cover these problems. Concrete tends to segregate due to flaky shape, lack of adequate fines, segregation of particles while transportation and Unloading.
IJSER © 2012
The research paper published by IJSER journal is about STRENGTH OF CONCRETE CONTAINING DIFFERENT TYPES OF FINE AGGREGATE 3
ISSN 2229-5518
Segregation during transportation can be prevented by spraying water, blending with natural sand, use of fibers to increase cohesion. Sometimes Concrete gives lower strength because of flaky particles or higher fines increase water demand, higher water demand translates in to higher water cement ratio. Controlling the quality of incoming material by visual inspection and regular sieve analysis solve such problems. Lower workability, lower slump re- tention, and inadequate vibration, segregation of concrete also managed by use of plasticizers, retarders and fly ash, complete compaction and finishing as early as possible.
From above test results, we came to know that Grit has proven to be highest compressible strength fine aggregate as compared to Natural Sand, Artificial Sand & combina- tion of Natural Sand & Artificial Sand.
In case of Beam the ultimate load for Artificial Sand is found to be maximum of 32KN with deflection 2.96mm and that of Grit with minimum ultimate load of 30KN with def- lection 2.60mm.
Grit gives maximum compressive strength 41.43MPa as compared to Natural Sand, Artificial Sand & combination of Natural Sand & Artificial Sand, which found to be 5% more with 100% replacement of Natural Sand in conven- tional concrete mix.
In case of cylinder for Tensile strength, Grit has given maximum Tensile strength 7.12 MPa, which is quite more than other.
From the above results and discussion we conclude that among the above four fine aggregate samples like Natural Sand, Artificial sand, Grit & Combination of both N.S.& Ar.Sand; Grit gives the maximum compressive strength.
Though grit and artificial sand gives nearly same results, grit is more preferable than artificial sand as it’s more eco- nomical.
Grits of various types obtained from various sources af- fects the strength and durability of concrete while compara- tively more uniqueness is achieved in case of artificial sand.
The use of manufactured sand in the construction indus- try helps to prevent unnecessary damages to the environ- ment and provide optimum exploitation of the resources.
Manufactured sands are made by crushing aggregate to
sizes appropriate for use as a fine aggregate. During the crushing process the manufactured sand have irregular shapes and more fine particles contributing to improved compressive strength, compared to natural sand control mix.
Due to the irregular particle shape of the manufactured sand, in addition to the reduced amount of water cement ratio, manufactured sand is more important for high strength concrete mixes.
Manufactured sand offers important economic advan-
tages in regions where the availability of natural sand is scarce or in cities where transportation cost is high.
The use of manufactured sand in the construction indus- try helps to prevent unnecessary damages to the environ- ment and provide optimum exploitation of the resources.
[1] M. Shahul Hameed and A. S. S. Sekar, JUNE 2009,” Properties Of Green Concrete Containing Quarry Rock Dust And Marble Sludge Powder As Fine Aggregate”, ARPN Journal of Engineering and Ap- plied Sciences, VOL. 4, NO. 4- ISSN 1819-6608
[2] R. Ilangovana, N. Mahendrana and K. Nagamanib, OCTOBER
2008, ” Strength And Durability Properties Of Concrete Containing Quarry Rock Dust As Fine Aggregate ", ARPN Journal of Engineer- ing and Applied Sciences, VOL. 3, NO. 5- ISSN 1819-6608
[3] Mahendra R. Chitlange and Prakash S. Pajgade, OCTOBER 2010,” Strength Appraisal Of Artificial Sand As Fine Aggregate In Sfrc”, ARPN Journal of Engineering and Applied Sciences-VOL. 5, NO.
10- ISSN 1819-6608
[4] V.R.K. Narasinha Raju1 and T. Appa Reddy, (2009),” Workability and Strength characteristics of Cement Concrete with Partial Replace- ment of River Sand by Manufactured Fine aggregate”, International Journal of Mechanics and Solids, ISSN 0973-1881 Volume 4, Number 1, pp. 95-104
[5] L. Zeghichi, (2006),” The Effect Of Replacement Of Naturals Aggre- gates By Slag Products On The Strength Of Co ncrete”, Asian Journal of Civil Engineering (Building And Housing) Vol. 7, Pages 27-35
[6] Radhikesh P. Nanda , Amiya K. Das , Moharana.N.C, 2010,” Stone crusher dust as a fine aggregate in Concrete for paving blocks”, Volume 1, No 3, ISSN 0976 – 4399
IJSER © 2012