- Open Access
- Authors : Mahadeva C K
- Paper ID : IJERTV8IS120294
- Volume & Issue : Volume 08, Issue 12 (December 2019)
- Published (First Online): 30-12-2019
- ISSN (Online) : 2278-0181
- Publisher Name : IJERT
- License: This work is licensed under a Creative Commons Attribution 4.0 International License
Strength Properties of Concrete by Replacing Coarse Aggregate by Gabbro Rocks
Mahadeva C K
Assistant professor, Department of civil engineering GMIT, Bharatinagara
Abstract Solid structure is comprised of cement, aggregate and water. In building development the aggregates normally utilized are limestone, in this way the determination of aggregate should to be in the major circumstance. To convey a good quality and excellent cement the materials utilized should be in promise to standard precise. A great deal of materials could be utilized as an admixture or even as a basic part of cement; the point of this examination is to utilize the Gabbro rock as a coarse aggregate in concrete. The pre-owned Gabbro in study is gotten from squander dark rock (as it's privately named). Results demonstrated as an increment in compressive strength. The extent of study remembers the examination for the quality, holding. The fundamental goal of the undertaking is to think about the properties of lime stone and a gabbro identified
with quality and its properties. The test conducted for gabbro rocks are flakiness index, elongation index, specific gravity, water absorption test and compressive strength of concrete. Using gabbro rocks concrete higher compressive strength and its properties of concrete.
Keywords: Coarse Aggregate, Compressive strength, fine aggregate, gabbro concrete.
Nowadays, as the field of civil engineering have become so innovative hence providing economic constructions and good strength. Use of Igneous rock aggregates in concrete mixes is to develop their physical properties by the properties of Gabbro rock. To get high strength and good workability gabbro rocks are completely added to the concrete mix in. By the usage of such igneous rock the experiment is carried out till the desired properties are obtained. Since concrete is the most significant part in auxiliary components, the total substance should be in a type of good quality for basic purposes. Concrete is comprised of aggregate, concrete and water. Through this mix of materials, three quarter of the blend is administered by aggregate. The aggregate itself is arranged as fine and coarse aggregate.
In this study, the scope of research will be focused on the use of coarse aggregate using Gabbro rock material. Before further discussion, it shall be better to have knowledge and clear understanding about the gabbro rock material and its properties and performances. Before further discussion, it shall be better to have knowledge and clear understanding about the gabbro rock material and its properties and performances.
Table 1: Classification of natural aggregates according to rock type (BS 812: Part 1: 1975)
Classification of natural aggregate
Basic porphyrites Diabase
Dolerites of all kinds
including theralite and
Teschenite. Epidiorite Lamprophyre Quartz-dolerite Spilite
Basic diorite Basic Gneiss Gabbro Hornblende-rock Norite
Peridotite Picrite Serpentinite
Gritstone Group (including fragmental volcanic rocks)
Gneiss Granite Granodiorite Granulite Pegmatite Quartz-diorite Syenite
Arkose Greywacke Grit Sandstone Tuff
Contact-altered rocks of all
kinds except marble.
Dolomite Limestone Marble Schist Group Phyllite Schist Slate
All severely sheared rocks.
Aplite Dacite Felsite Granophyre Keratophyre Microgranite
Ganister Quarzitic sandstones
2. MATERIALS AND METHODOLOGY
Sampling of cubes for test
Clean the mounds and apply oil.
Fill the concrete in the moulds in layers approximately 5 cm thick.
Compact each layer with not less than 35 strokes per layer using a tamping rod (steel bar 16mm diameter and 60cm long, bullet pointed at lower end).
REGION OF GABBRO ROCK AVAILABILITY IN INDIA:
Gabbro rock an area of about 5,00,000 sq.km. covers large part of Maharashtra.
Karnataka about 31,500 sq.km. covering Bidar, Belgaum, Bijapur, and Gulbarga Districts.
Fig 1: Geological map shows the gabbro rocks
To prove the specification of gabbro aggregate we are conducted flakiness and elongation test. Bonding between aggregate and cement paste depends on the aggregate surface. Since the rough surface requires more bonding than the smooth surface, the texture of aggregate to be tested should comply with the requirement of standard specification.
Energy Dispersive X-ray Spectroscopy (EDS)
EDS can be utilized to locate the synthetic of materials down to a spot size of a couple of microns, and to make component creation maps over an a lot more extensive raster zone. Together, these capacities give principal compositional data to a wide assortment of materials. An EDS finder contains a precious stone that ingests the vitality of approaching x- beams by ionization, yielding free electrons in the gem that become conductive and produce an electrical charge predisposition.
Precautions for test
The water for curing should be tested every 7 days and the temperature of water must be at 27+-20 C.
Sieve analysis 4.79 (F.A)
Specific gravity 2.76 (F.A)
Bulking of Sand 35.86%
Sieve analysis 4.37 fineness modulus
Standard consistency of cement 34%
Setting time of cement initial 35 min.
Setting time of cement Final 10 hrs.
Fineness of cement 6%
Impact text 10.99%
Flakiness and elongation E index – 43.68%
Slump test 125mm
Compaction factor test 0.984
GABBRO ROCK TESTS
specific gravity 2.62
sieve analysis 2.01
Flakiness and elongation index F index 14.56 % Flakiness and elongation index E index 50.65 % A-7 MIX PROPORTIONS
Cement = 383.16 kg/m3 Water = 191.58 Litres
Fine aggregate = 731.4kg/m3. Coarse aggregate = 1084.68kg/m3. Gabbro aggregate = 1265.46kg/m3.
RESULTS OF EDS TEST
A typical EDS spectrum is portrayed as a plot of x-ray counts vs. energy (in keV). Energy peaks correspond to the various elements in the sample. Generally they are narrow and readily resolved, but many elements yield multiple peaks. For example, iron commonly shows strong K and Kpeaks. Elements in low abundance will generate x-ray peaks that may not be resolvable from the background radiation.
PROCEDURE FOR CONCRETE CUBE TEST
After curing specimen is taken out from curing tank and wipe out cube and clean well.
Measure the dimension of the specimen nearest to 0.1mm.
To remove the dust rom compression or universal testing machine.
Test specimens are placed on the testing machine opposite to load direction and test is conducted as per Indian standard code.
Specimen is placed centrally on the specimen.
Apply the load gradually on the test specimen and note down the readings and calculate the strength of the cube.
Record the maximum load and note down the readings and find the usual features.
Fig 2: Compressive Testing Machine
RESULTS AND DISCUSSION
Table2: Chemical Composition of Gabbro Aggregate
Table 3: Compressive strength of concrete at various ages
Table 4: Compressive strength test conducted
Sl N o
proportioni ng of material
Load in KN
Compressive strength in N/mm2
Avg compressive strength in n/mm2
Lime stone aggregate
Table 5: Quantitative Results for: Base (454)
Weight in %
Weight of % Error
Table 6: Compressive strength test conducted
Lime stone Aggregate
Compression strength (N/mm2)
As gabbro rocks is a normally accessible volcanic stone, one of the most solid and scratch obstruction material having dark/dark shading. The compound structure of gabbro contains a few liquefied minerals together framing extremely hard rock, it contains quartz, chromium, nickel, cobalt, gold, silver, platinum and iron.
They can be utilized as high quality solid aggregates in the concrete mix.
The need of this task examination is to utilize gabbro as coarse aggregate in study, since the gabbro is costly, the utilization of waste gabbro from nearby markets structures lessen the general expense of development.
When in contact with different synthetic compounds they give no substance responses that may harm wellbeing on the earth.
So it is natural genial material. Subsequently, the gabbro rocks can be utilized as looking for structures, clearing, and deck and improvement purposes.
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