A Study on Mechanical Properties of Self-Compacting Concrete by Partial Replacing Cement with Pozzolanic Materials Fly Ash, Silica Fume and Lime Sludge | Concrete | Cement

Please download to get full document.

View again

of 6
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Information Report
Category:

Documents

Published:

Views: 14 | Pages: 6

Extension: PDF | Download: 0

Share
Related documents
Description
Now a days the production of cement is highly coastly and significantly affects the environment. the CO2 has increased manifold over the last decade or so leading to global warming .thus it is the need of the how to contro the usage of cement so that its production can be reduced optimal usage the present study has been done to find the optimal usage industrial by products fly ash, silicafume, limesludge to be as substitutes of cement Fly ash, a byproduct from the thermal power plant and it is a pozzolanic material. Silica fume as very fine non crystalline silica produced in blast furnace as by product of the production of elemental silicon or alloys containing silicon .Lime sludge is generated from paper, acetylene, sugar, fertilizer, sodium chromate and soda ash industries Attempts have been made to study the properties of self-compacted concrete and to investigate properties of fly ash, silica fume, lime sludg and its suitability of those properties to enable them to be used as partial replacement materials for cement in concrete Experimental investigation on strength aspects like compressive, flexural, and split tensile strengths of self-compacting concrete (SCC) containing different levels of flyash, silica fumes, lime sludge, and workability tests for different mineral admixtures (slump, L –box, V-funnel and T50 ) are carried out .the methodology adopted is that mineral fly ash is replaced by ((5%,10%,15%,20%,25%,30%), silica fume (5%,10%,15%,20%,25%,30%), lime sludge (5%,10%,15%,20%, 25%,30%) in cement and performance is measured and compared. Hardned tests carried out by two different combinations of these three pozzolanic materials 1.(flyash+silica fume+limesludge) is replaced by(25%+5%+0%, 20%+5%+5%, 15%+5%+10%, 10%+5%+15%) in cement and performance is measured. 2. (silica fume+fly ash) is replaced by (2.5 %S+5%F, 5%S+10%F , 7.5%S+15%F, 10%S+20%F, 12%S+15%F ) in cement and performance is measured.
Transcript
  IJIRST  –  International Journal for Innovative Research in Science & Technology| Volume 3 | Issue 05 | October 2016   ISSN (online): 2349-6010 All rights reserved by www.ijirst.org   151 A Study on Mechanical Properties of Self-Compacting Concrete by Partial Replacing Cement with Pozzolanic Materials Fly Ash, Silica Fume and Lime Sludge  M. Venkateswari Mrs J. Keerthana PG Student Assistant Professor  Department of Civil Engineering Department of Civil Engineering  DNR College of Engineering & Technology Bhimavaram,  Andhra Pradesh, India  DNR College of Engineering & Technology Bhimavaram,  Andhra Pradesh, India Mr. M. K. M. V. Ratnam Dr. U. Ranga Raju  Assistant Professor Professor  Department of Civil Engineering Department of Civil Engineering  DNR College of Engineering & Technology Bhimavaram,  Andhra Pradesh, India  DNR College of Engineering & Technology Bhimavaram,  Andhra Pradesh, India Abstract    Now a days the production of cement is highly coastly and significantly affects the environment. the CO2 has increased manifold over the last decade or so leading to global warming .thus it is the need of the how to contro the usage of cement so that its  production can be reduced optimal usage the present study has been done to find the optimal usage industrial by products fly ash, silicafume, limesludge to be as substitutes of cement Fly ash, a byproduct from the thermal power plant and it is a pozzolanic material. Silica fume as very fine non crystalline silica produced in blast furnace as by product of the production of elemental silicon or alloys containing silicon .Lime sludge is generated from paper, acetylene, sugar, fertilizer, sodium chromate and soda ash industries Attempts have been made to study the properties of self-compacted concrete and to investigate properties of fly ash, silica fume, lime sludg and its suitability of those properties to enable them to be used as partial replacement materials for cement in concrete Experimental investigation on strength aspects like compressive, flexural, and split tensile strengths of self-compacting concrete (SCC) containing different levels of flyash, silica fumes, lime sludge, and workability tests for different mineral admixtures (slump, L  –   box, V-funnel and T50 ) are carried out .the methodology adopted is that mineral fly ash is replaced by ((5%,10%,15%,20%,25%,30%), silica fume (5%,10%,15%,20%,25%,30%), lime sludge (5%,10%,15%,20%, 25%,30%) in cement and performance is measured and compared. Hardned tests carried out by two different combinations of these three pozzolanic materials 1.(flyash+silica fume+limesludge) is replaced by(25%+5%+0%, 20%+5%+5%, 15%+5%+10%, 10%+5%+15%) in cement and performance is measured. 2. (silica fume+fly ash) is replaced by (2.5 %S+5%F, 5%S+10%F , 7.5%S+15%F, 10%S+20%F, 12%S+15%F ) in cement and performance is measured. Keywords: Self-Compacting Concrete, Fly Ash, Silica Fume and Lime Sludge  _______________________________________________________________________________________________________ I.   I NTRODUCTION   Concrete technology has under gone from macro to micro level study in the enhancement of strength and durability properties from 1980’s onwards. Till 1980 the research study was focused only to flow ability of concrete, so as to enhance the strength  however durability did not draw lot of attention of the concrete technologists. This type of study has resulted in the development of self compacting concrete (SCC), a much needed revolution in concrete industry. Self compacting concrete is highly engineered concrete with much higher fluidity without segregation and is capable of filling every corner of form work under its self weight only (Okamura 1999) . Thus SCC eliminates the needs of vibration either external or internal for the compaction of the concrete without compromising its engineering properties. Compaction for conventional concrete is done by vibrating. Over vibration can easily cause segregation. In conventional concrete, it is difficult to ensure uniform material quality and good density in heavily reinforced locations. If steel is not properly surrounded by concrete it leads to durability problems. The SCC concept can be stated as the concrete that meets special performance and uniformity requirements that cannot always  be obtained by using conventional ingredients, normal mixing procedure and curing practices. The SCC is an engineered material consisting of cement, aggregates, water and admixtures with several new constituents like colloidal silica, pozzolanic materials, and chemical admixtures to take care of specific requirements, such as, high-flow ability, compressive strength, high workability, enhanced resistances to chemical or mechanical stresses, lower permeability, durability, resistance against   A Study on Mechanical Properties of Self-Compacting Concrete by Partial Replacing Cement with Pozzolanic Materials Fly Ash, Silica Fume and Lime Sludge   (IJIRST/ Volume 3 / Issue 05/ 028) All rights reserved by www.ijirst.org   152 segregation, and possibility under dense reinforcement conditions. The properties, such as, fluidity and high resistance to segregation enables the placement of concrete without vibrations and with reduced labour, noise and much less wear and tear of equipment. Use of SCC overcomes the problem of concrete placement in heavily reinforced sections and it helps to shorten construction period. Self-compacting concrete is growing rapidly, especially in the precast market where its advantages are rapidly understood and utilized. in view of global warming ,efforts are on to reduce the emission of carbon di oxide to the environment .cement industry is amajor contributor in the emission of carbon di oxide as well as using up high levels of energy resources in the production of cement .by replacing cement with a material of pozzolanic characterstic ,such as industrial wastes fly ash ,silica fumes ,lime sludge (these are industrial wastes and recently, agricultural wastes are also being used as pozzolanic materials in concrete ) ,the cement and concrete industry together can meet the growing demand in the construction industry as well as help in reducing the environmental pollution. When pozzolanic materials are incorporated to concrete, the silica present in these materials react with the calcium hydroxide released during the hydration of cement and forms additional calcium silicate hydrate (C  –   S  –   H ), which improve the mechanical properties of concrete. The purpose of this research was to study the application and utility of these industrial wastes as a cementitious/pozzolanic material in construction Industry. II.   L ITERATURE REVIEW   Cengiz (2005) used fly-ash with SCC in different proportional limit of 0%, 50% and 70% replacement of normal Portland cement (NPC). He investigated the strength properties of self compacted concrete prepared using HVFA (high volume fly ash). Concrete mixtures made with water-cementitious material ratios ranged from 0.28 to 0.43 were cured at moist and dry curing conditions. He investigated the strength properties of the mix and developed a relationship between compressive strength and flexural tensile strength. The study proved that it is possible to convert an RCC (zero slump) concrete to a workable concrete with the use of suitable superplasticizer. E. Sureshkumar et al (2013), this paper examines the possibility of using copper slag as partial replacement of sand and Nano Silica as partial replacement of cement and super plasticizer and Viscosity Modifying Agent are used in self compacting concrete, in order to overcome problems associated with cast-in-place concrete. Self compacting concrete does not require skilled labours. The percentage of copper slag to be added is 10%, 20%, 30% of total weight of sand. The percentage of Nano Silica to be added is 2%, 4%, 6%, and 8% of total weight of cement. According to ACI: 211.4R code of practice, control specimen is casted for M40. Finally the workability and strength characteristics of concrete have been compared with conventional concrete III.   E XPERIMENTAL ANALYSIS   Cement: (ANJANI cement of 53grade ordinary Portland cement was used) The cement used for the investigation was Ordinary Portland cement .the cement is fresh and is of uniform colour and consistency.it is free from lumps and foreign matter. The cement The cement procured was tested for physical requirements in accordance with IS : 12269-1987 and for chemical requirements in accordance with IS: 4032-1977.The cement conforms to 53 grade  Fly Ash Fly ash is one of the types of coal combustion by- products .The use of these by-products offers environmental advantages divert the material from the waste stream, reduce the energy used in processing virgin materials, use of virgin materials, and decreases  pollution.in this experimental investigation the fly ash used confirming to IS: 3812-2003 part- II. Silica Fume Silica fume as very fine non crystalline silica produced in blast furnace as by product of the production of elemental silicon or alloys containing silicon. Silica fume is usually categorized as a supplementary cementitious material. It has excellent pozzolanic  properties. in this experimental investigation the silica fume is in white colour powder form.  Lime Sludge Lime sludge is generated from paper, acetylene, sugar, fertilizer, sodium chromate and soda ash industries. Approximately 4.5 million tons of sludge in total are generated annually from these industries. The lime sludge from paper industry has been found suitable as blending material for manufacture of masonry cement in the proportion of up to 30 percent conforming the Indian Standard specification of IS:3466-1988.   A Study on Mechanical Properties of Self-Compacting Concrete by Partial Replacing Cement with Pozzolanic Materials Fly Ash, Silica Fume and Lime Sludge   (IJIRST/ Volume 3 / Issue 05/ 028) All rights reserved by www.ijirst.org   153  Fine Aggregate (Sand) The fine aggregate used in this experimental investigation is river sand confirming to zone-II as per IS:383:1970. The sand is free from clay, silt and organic impurities. sand which is passing through 600micron sieve is taken and The sand is tested for various properties like specific gravity, bulk density etc., and in accordance with IS 2386-1963. Coarse Aggregate The coare aggregate used, was from an established quarry satisfying the requirements of IS:383:1970. In this experimental investigation Machine crushed angular granite metal of 20mm nominal size from the local source is used as coarse aggregate .It is free from impurities such as dust, clay particles and organic matter etc. The coarse aggregate is also tested for its various  properties specific gravity, bulk density and fineness modulus of coarse aggregate were found to be 2.74, 1580kg/m3 and 7.17 respectively. Chemical Admixture Chemical admixture reduces the cost of construction the cost of construction, modify the properties of concrete and improve the quality of concrete during mixing, transportation, placing, and curing. IV.   T ESTS CONDUCTED    Fresh Concrete Tests For determining the self-compatibility properties (slump flow, t50 time, v-funnel flow time, l-box blocking ratio) tests were  performed on all mixtures the order of testing was:   1)   Slump flow test and measurement of T50 time 2)   V-funnel flow test 3)   L- box blocking test ,respectively. The tests were performed according with EFNARC standards. Slump flow test and measurement of T50 time a)   Filling Ability Self-compacting concrete must be able to flow into all the spaces within the formwork under its own weight. This is related to workability, as measured by slump flow test and slump flow T50cm test shown in Fig.3. Fig. 1: Slump flow Fig. 2: Dimensions of base plate Fig. 3: Slump Flow Test The fresh concrete poured into a cone as used for slump test when the cone is withdrawn upwords the time from commencing upword movement of the cone to when concrete has flowed to a diameter of 500mm is measured ,this is the T 50 time the largest diameter of the flow spread of the concrete and the diameter of the spread at right angles to it are then measured and the mean is the slump flow V-Funnel Flow Test a)   Resistance of Segregation Resistance to the segregation is the property that characterizes the ability of the SCC to avoid the segregation of its components, such as the coarse aggregates. The V- Funnel T5min test is the most common method used to assess this property.   A Study on Mechanical Properties of Self-Compacting Concrete by Partial Replacing Cement with Pozzolanic Materials Fly Ash, Silica Fume and Lime Sludge   (IJIRST/ Volume 3 / Issue 05/ 028) All rights reserved by www.ijirst.org   154 Fig. 4: Dimensions of v-funnel test Fig. 5: V- Funnel test Fig. 6: V- Funnel flow A ‘V’shaped funnel is filled with fresh concrete and the time taken for the concrete to flow out of the funnel is measured an d recorded as the V-funnel flow time.  L- box text a)   Passing Ability Self compacting concrete must flow through tight openings such as spaces between steel reinforcing bars under its own weight. The mix must not ‘block’ during placement. L -Box test are the most common methods used to assess this property. Fig. 7: Dimensions of L-Box Fig. 8: Flow through rebar in L-Box A measured volume of fresh concrete is allowed to flow hsrcontally throw the gaps between vertical, smooth reinforcing bars and the height of the concrete beyond the reinforcement is measured.  Hardened Tests    Compressive Strength      Split Tensile Strength    Flexural Strength Compressive, flexural strength tests were performed as per Indian standards 516:1959, split tensile strength test was performed as per Indian standards 5816:1970. Compressive Strength Compressive strength can be defined as the measure maximum resistance of a concrete to axial loading. The specimens used in the compressive test are: 150 mm x 150mm x 150mm Fig. 9: Compression Testing Machine
Recommended
View more...
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks