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Divya Krishnan, K.
- Study on Mechanical Properties of Concrete with Manufactured Sand and Bagasse Ash
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Authors
Affiliations
1 Department of Civil Engineering, SRM University, Kattankulathur - 603203, Tamil Nadu, IN
2 Department of Civil Engineering, SAINTGITS College of Engineering, Kottayam - 686532, Kerala, IN
1 Department of Civil Engineering, SRM University, Kattankulathur - 603203, Tamil Nadu, IN
2 Department of Civil Engineering, SAINTGITS College of Engineering, Kottayam - 686532, Kerala, IN
Source
Indian Journal of Science and Technology, Vol 9, No 34 (2016), Pagination:Abstract
Background/Objectives: In the construction of structures river sand used as fine aggregate in concrete for centuries. River sand is not a renewable natural resource. In most of the area, river sand has been excessively exploited, which has endangered the stability of river banks and the safety of bridges, and creates an environmental problem. Hence, minimization of the use of river sand inevitable. Methods: In this study, the Manufactured sand (M-sand), produced by crushing rock depositions as a fine aggregate used in concrete. The M-sand is more angular and has rougher surface texture than river sand. In the M60 grade concrete, M-sand is used as fine aggregate and Bagasse Ash (BA) used as a pozzolanic material for the partial replacement of cement. Bagasse ash has partially replaced by the ratio of 0%, 10%, 20%, 30% and 40% by volume of cementation material in concrete. M-sand has been replaced by fully by volume of fine aggregate. In this investigation, to study the properties of concrete test likes Compressive Strength, Tensile Strength, Flexural Strength, Young’s modulus and Workability of concrete were carried out. The effects of M-sand on mechanical properties, studies with and without partial replacement of Bagasse ash were studies at the age of 7, 28 days. Findings: The test results show that the incorporation of Bagasse Ash up to 20% replacement level increases the mechanical properties of concrete. The variation in use of M-sand in concrete as compared to the river sand with the Bagasse Ash shows the minimum variation in the strength properties. Applications/Improvement: From this study, it is observed that the use of M-sand in high strength concrete can be use for the replacement of fine aggregate in M60 concrete. Use of Bagasse ash up to 20-30 % can be effectively used in concrete with or without the addition of M-sand, where the Bagasse ash available in plenty.Keywords
Bagasse Ash, Compressive strength, Manufactured Sand.- Strength Characteristics of High Strength Concrete using M-sand
Abstract Views :136 |
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Authors
Affiliations
1 Department of Civil Engineering, SRM University, Kattankulathur, Chennai - 603203, Tamil Nadu, IN
1 Department of Civil Engineering, SRM University, Kattankulathur, Chennai - 603203, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 9, No 41 (2016), Pagination:Abstract
Background/Objectives: The construction industry mainly aims at sustainable construction with the available natural resources by reducing the negative environmental impacts on environment. Over a period of time, the scarcity of fine aggregate has become one of the most complex and challenging problem in the construction field. In India, the escalation in the price of natural river sand leads to the demand in the alternate construction material by considering Manufactured Sand (M sand) as a fine aggregate which solve the problem of scarcity. The focus of the present investigation is to assess the potential of using Manufactured sand as a replacement to fine aggregate in M60 grade concrete. Fly ash and silica fume also used to reduce the cement content and as a voids filler material. Methods Statistical Analysis: In the present investigation, it is aimed at to study 0, 25, 50, 75 and 100% of traditional fine aggregate replaced with M- sand. The test results are obtained by conducting compressive strength test, split tensile strength test and flexural strength test after 3, 14, 28 and 60 days of curing. Findings: The strength characteristics of concrete shows higher its strength with the partial and 100% replacement of M-sand in fine aggregate for all the curing period studied. An increase of 6.27% and 14.65 % in compressive and split tensile strength is observed by the full replacement of river sand with M- sand at the curing period of 28th day. Application/Improvements: Use of Manufactured sand in high strength concrete serves better alternative for the river sand. The utilization of manufactured sand in concrete as fine aggregate reduces the problem in scarcity of natural sand and reduces the time delay and cost of the construction.Keywords
Compressive Strength, High Strength, Manufacatured Sand, River Sand.- Utilisation of Phosphogypusm and Flyash in Soil Stabilisation
Abstract Views :147 |
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Authors
Affiliations
1 Department of Civil Engineering, SRM University, Kattankulathur - 603203, Tamil Nadu, IN
1 Department of Civil Engineering, SRM University, Kattankulathur - 603203, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 9, No 33 (2016), Pagination:Abstract
Background/Objectives: Buildable land with good natural bearing capacity is reducing and it leads to the construction of buildings on poor soils which are finally leads to structural foundation failures. This necessitated the use of available admixtures for the improvement of soil characteristics economically. Among the available resources, industrial by- products can be effectively used as admixtures since it can solve the hazardous problems due to its disposal. Methods: Grain size analysis and Atterberg’s limits tests are conducted to classify the soils used in this study. To evaluate the effect of admixtures, strengths characteristics of soils were observed by Unconfined Compressive Strength and California Bearing Ratio tests. Weak soils having high expansive characteristics are used to study the activation of 5% fly ash blended with Phospho Gypsum (PG) at varying percentages of 2%, 4% and 6% with two weak soils at different curing conditions. Findings: Results shows higher strength development upto a percentage of 4% PG with 5% flyash with both the soils. Effect of curing periods on strength characteristics of treated soils at 7, 28 and 60 days were also considered in this study. Microstructural studies are also showing an improvement in microstructure which is examined in SEM micrographs and XRD results. The influence of flyash with different percentages of phosphogypsum on swelling characteristics shows a decrease in swell potential of treated soil with increase in curing periods. Improvement: This study gives an effective application of Phospho Gypsum and Fly Ash in geotechnical field by using it as a relevant soil stabilizer. Increase in CBR values were obtained with Fly Ash and Phospho Gypsum combinations with soils, which reduces the thickness of pavement and making more productive use of industrial wastes with considerable environmental benefits.Keywords
Compressive Strength, Fly Ash, Phosphogypusm, Stabiisation- Effectiveness Study of RBI81 in Stabilisation of Soil
Abstract Views :153 |
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Authors
Affiliations
1 Department of Civil Engineering, SRM University, Kattankulathur - 603203, Tamil Nadu, IN
1 Department of Civil Engineering, SRM University, Kattankulathur - 603203, Tamil Nadu, IN
Source
Indian Journal of Science and Technology, Vol 9, No 33 (2016), Pagination:Abstract
Background/Objectives: Problematic soils cause more damage to structures which are resting over it due to less strength to support the loads acting on them during the construction as well as in service periods. A proper treatment of the subgrade soil is required for providing a stable working area for the construction of structures. In geotechnical point of view, soil stabilization with suitable admixtures fulfils the improvement in the soil characteristics for construction of foundation for light structures and pavements. Methods/Statistical Analysis: In this study an attempt is made to analyse the effect of soil stabiliser RBI grade 81 on two different soils treated with varying percentages of admixture for different curing periods. The strength properties are studied by conducting the UCC and CBR test for treated soils with 2%, 4% and 6% of RBI for specific curing of 7, 28 and 60 days. Microstuctural studies by Scanning electron microscopy had done on untreated and treated soils shows the relevant structural changes which promotes the strength attainment with the addition of admixtures while curing period increases. Findings: This study shows a substantial improvement in problematic soils by treated with RBI grade 81 shows the increasing value of UCC ranging from 1.5 to 11 times and California Bearing Ratio values shows an increase of 65% and 41% from 2% and 2.19% for the both the soils with the addition of 6% RBI additives at the curing period of 60 days. Improvement/Applications: Use of RBI 81 in soil stabilisation renders a better stabilizing agent making the soils capable of meeting the constructional requirements with improved engineering properties.Keywords
CBR, RBI 81, Soil Stabilisation, UCS- Study on Behaviour of Soil with Phosphogypsum as Stabiliser
Abstract Views :189 |
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Authors
Affiliations
1 Department of Civil Engineering, SRM University, Kattankulathur- 603203, Tamil Nadu, IN
2 Department of Civil Engineering, SAINTGITS College of Engineering, Kottayam - 686532, Kerala, IN
1 Department of Civil Engineering, SRM University, Kattankulathur- 603203, Tamil Nadu, IN
2 Department of Civil Engineering, SAINTGITS College of Engineering, Kottayam - 686532, Kerala, IN