A Study On Self-Compacting Concrete by Partial Replacement of Cement With Silica Fume and Ground-Granulated Blast-Furnace Slag (Ggbs or GGBFS)
A Study On Self-Compacting Concrete by Partial Replacement of Cement With Silica Fume and Ground-Granulated Blast-Furnace Slag (Ggbs or GGBFS)
A Study On Self-Compacting Concrete by Partial Replacement of Cement With Silica Fume and Ground-Granulated Blast-Furnace Slag (Ggbs or GGBFS)
ABSTRACT: Self-compacting concrete (SCC) can flow and (VMA). While the use of superplasticizer maintains the
compact under its own weight into a uniform void free mass fluidity, the fine content provides stability of the mix as a
even in areas of congested reinforcement. This paper result resistance against bleeding and segregation increases.
focuses on the effects of Silica Fume and Ground- The highly fluid nature of Self-Compacting concrete makes
granulated blast-furnace slag (GGBS or GGBFS) on all the it suitable for placing in difficult conditions and in sections
main properties of concrete in the fresh and hardened state. with congested reinforcement.
The mix design for SCC was arrived as per the Guidelines
of European Federation of National Associations II. OBJECTIVES OF THE PRESENT STUDY
Representing for Concrete (EFNARC-2005). In this The objectives of the study are:
investigation, SCC was made by usual ingredients such as To find the properties of the materials such as
cement, fine aggregate, coarse aggregate, water and cement, sand, coarse aggregate, water etc.
mineral admixture silica fume and GGBS at various To obtain Mix proportions by considering
replacement levels. The super plasticizer used was Glenium properties of fresh concrete (according to EFNARC
B233. Workability of the fresh concrete is determined by guidelines).
using tests such as: slump flow, L-Box and U-box tests. The To caste and cure the concrete specimens such as
mixes were then tested for other mechanical properties like, cubes, cylinders, and beams.
cube compressive strength at 7th day, 28th day, split tensile To evaluate the mechanical characteristics of
strength, and flexural strength at 28th day. For all levels of concrete such as compressive strength, split tensile
cement replacement with admixtures concrete achieved test, flexural strength.
superior performance in the fresh and mechanical tests. To evaluate the results.
Keywords: Self-Compacting Concrete, Silica Fume, GGBS,
Glenium B233, Workability, compressive strength, split III. MATERIAL PROPERTIES
tensile strength, Flexural strength. The materials used in this research are:
I. INTRODUCTION 3.1 Cement
Concrete is a strong and versatile mouldable construction Ordinary Portland cement of 53 grade was used in this
material. It consists of cement, sand and aggregate mixed investigation.
with water. The cement and water form a paste which coats
the sand and aggregate. The durability of concrete structures Table-1: Approximate Oxide Composition Limits of
was the main criteria, the creation of durable concrete Ordinary Portland cement
structures requires adequate compaction by skilled workers Oxide Percent content
.when percentage of reinforcement is high the compaction
becomes complex as the reinforcement does not allow Cao 60-67
insertion of vibrator at some places. Also the vibration leads Sio2 17-25
to noise pollution. Beside thisproblem there is also a gradual Al2o3 3.0-8.0
reduction in the number of skilled workers around the world Fe2o3 0.5-6.0
.Self-compacting concrete was therefore developed to
Mgo 0.1-4.0
overcome all these problems. Self-compacting concrete also
called as Self-consolidating concrete or self-levelling Alkalies 0.4-1.3
concrete Self-compacting concrete, it is a flowing concrete So3 1.3-3.0
mixture that is able to consolidate under its own weight with
little or no vibration effort, and which is at the same time The Details of Tests Conducted on Cement are Described
cohesive enough to handle without segregation or bleeding of Below.
fresh concrete. Self-Compacting concrete mixes usually
contain superplasticizer (high water reducing admixture), Table-2: Properties of fine aggregate
high content of fines and or viscosity modifying additive
Table-13: Flexural Strength of Concrete vs Different Mix Graph- 5.3: U-Box Test Results vs Different Mixes
7.3Graphs
Graph- 1: Slump Cone Test Result svs Different Mixes
Graph-6: Flexural Strength vs Different Mixes Compacting Concrete Using Mineral And Chemical
Admixture
[6]. BiswadeepBharali “EXPERIMENTAL STUDY ON
SELF COMPACTING CONCRETE (SSC) USING
GGBS AND FLY ASH”
[7]. J. M.Srishaila1, Adarsh Uttarkar2, Prakash
Parasivamurthy3,“VeenaJawali Influence of Fly
Ash and Silica Fumes on the Behavior of Self
Compacting Concrete”
[8]. N. K. Amudhavalli, JeenaMathew “EFFECT OF
SILICA FUME ON STRENGTH AND
DURABILITY PARAMETERS OF CONCRETE”
[9]. B.H.V. Pai, M. Nandy, A. Krishnamoorthy
,P.K.Sarkar C.
PramukhGanapathyEXPERIMENTAL STUDY ON
SELFCOMPACTING CONCRETE CONTAINING
INDUSTRIAL BY-PRODUCTS
VII. CONCLUSION [10]. A.A. Maghsoudi, Sh. Mohamadpour, M.
The application of silica fume and GGBS in concrete mixture MaghsoudiMIX DESIGN AND MECHANICAL
has significantly increasing and enhancing the properties of PROPERTIES OF SELF COMPACTING
the concrete whether it is in wet stage or in harden condition. LIGHTweight concrete
Form results it is clear that silica fume of 6% gives best [11]. N. K. Amudhavalli, JeenaMathew:“EFFECT OF
results. And it is suggested that silica fume while using with SILICA FUME ON STRENGTH AND
GGBS not more than 6% is preferred to replace the cement. DURABILITY PARAMETERS OF CONCRETE”
Rheological tests conducted were sufficient to ascertain [12]. https://www.hindawi.com/journals/tswj/2014/98656
whether the mix will have all the attributes of SCC or not. 7/
Silica fume provide mechanical strength to high performance
self-compacting concrete by increasing the density. Addition
of silica fumes developed filling and passing ability of
concrete. From the results of mechanical properties, we know
that the compressive strength has shown considerable
increase from 7 days curing till 28 days of curing. Similarly
flexural strength has increased at that same duration but not
as much as the compressive strength of the concrete.In
general, SSC with GGBS and silica fumes exhibits better
performance in compression as compared to flexure. But
setting time increase due to GGBS. Due to this temperature
increases gradually, this leads to high strength. As the density
and strength increases SSC have good resistance to
temperature changes, chemical attacks as a result life span of
the structure increases. It is best suitable for marine
constructions where there are great chances of chlorine and
sulphate attacks. The cost of SCC is higher than the
conventional concrete, but it can be ignored by considering
its performance.
REFERENCES
[1]. EFNARC (2005), “Specification and Guidelines for
Self Compact Concrete”
[2]. Darshan H R, M.RameGowda ”DEVELOPMENT
AND STUDY OF BEHAVIOR OF SELF-
COMPACTING CONCRETE USING GGBS”
[3]. Salem Alsanusi “Influence of Silica Fume on the
Properties of Self Compacting Concrete”
[4]. J. M. Srishaila, Karthik Poovaiah D, K. N.
Vishwanath, P. Prakash Development of High
Strength Self Compacting Concrete Using Mineral
And Chemical Admixture
[5]. Aravinth S. N.Development of High Strength Self