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M. Vijaya Sekhar Reddy ¹, I.V. Ramana Reddy ², K. Madan Mohan Reddy ¹, N. Krishna Murthy ³, P. Ramesh ⁴

Affiliations
1 Department of Civil Engineering, Srikalahasteeswara Institute of Technology, Srikalahasti, AP, IN
2 Department of Civil Engineering, Sri Venkateswara University College of Engineering, Tirupati, AP, IN
3 Engineering Department, Yogi Vemana University, Kadapa, IN
4 Department of Civil Engineering, Sri Vidyanikethan Engineering College, Rangampeta, Tirupati, AP, IN

Abstract

Portland cement has been a very satisfactory hydraulic binder for structural applications for a long time now. However there are many new issues stemming from its ever increasing use. Sustainable development today demands development of new concrete technologies, which use less natural resources and energy, and generate less CO2, without compromising on strength and durability properties. Supplementary Cementing Materials (SCMs) such as Flyash, Blast Furnace Slag, Silica Fume and Metakaoline etc., either in singly or in combination, in development of alternate binder systems is thus of economic and ecological significance. In the recent years, use of High Performance Concrete (HPC) in the construction industry as got momentum. For designing HPC, both SCMs and Superplasticizers are essential for the improvement of Workability and Mechanical Properties. The paper presents experimental studies conducted on two grades of HPC mixes of M50 and M60 using mineral and chemical admixtures in various proportions. Overall, the paper highlights the usage of admixtures to achieve high strength concrete mixes and from the experimental investigation it is clear that mineral admixtures contribute effectively a lot not only for achieving durability, also high strength.

Keywords

Supplementary Cementing Materials (SCMs), High Performance Concrete (HPC), Flyash, Blast Furnace Slag, Silica Fume, Metakaoline.

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M. Vijaya Sekhar Reddy ¹, I. V. Ramana Reddy ², K. Madan Mohan Reddy ¹, N. Krishna Murthy ³, T. Venumadhav ⁴

Affiliations
1 Department of Civil Engineering, Sri kalahasteeswara Institute of Technology, Srikalahasti, AP, IN
2 Department of Civil Engineering, Sri Venkateswara University College of Engineering, Tirupati, AP, IN
3 Engineering Department, Yogi Vemana University, Kadapa, AP, IN
4 Department of Civil Engineering, Audi Sankara College of Engineering, Gudur, AP, IN

Abstract

This paper presents the evaluation of mechanical properties of binary blended concrete. Binary blended concrete have been developed by the individual replacement of Supplementary Cementing Materials (SCM's) like Fly-ash, Silica fume and Metakaoline. The results of binary blended concrete are compared with those of control concrete. The main purpose of this investigation is to develop confidence among user agencies in India to use mineral and chemical admixtures in a desirable proportion in most of the construction works. The paper presents experimental studies conducted on M₃₀ grade of concrete using SCMs and chemical admixtures in various proportions. The cubes and cylindrical specimens after de-moulding were stored in curing tanks and on removal of cubes and cylinders from water the compressive strength and split tensile strength were conducted at 7days, 28days, 90 days and 180 days. The test results were compared with individual percentage replacements of SCMs for M₃₀ grade concrete with and without chemical admixture.

Keywords

Supplementary Cementing Materials (SCMs), Binary Blended Concrete, Compressive Strength, Split Tensile Strength, Flyash (FA), Silica Fume (SF), Metakaoline.

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M. Vijaya Sekhar Reddy ¹, I. V. Ramana Reddy ², K. Madan Mohan Reddy ¹, C. M. Ravi Kumar ³, K. Chandra Sekhar Reddy ⁴

Affiliations
1 Department of Civil Engineering, Srikalahasteeswara Institute of Technology, Srikalahasti, AP, IN
2 Department of Civil Engineering, Sri Venkateswara University College of Engineering, Tirupati, AP, IN
3 Department of Civil Engineering, VTUBTDC, Davanagere, Karnataka, IN
4 Department of Civil Engineering, Siddharth Institute of Engineering & Technology, Puttur, Chittoor, A.P, IN

Abstract

In today's competitive environment it is becoming important to reduce the construction cost in one or other way. Now a day's OPC is widely used and it is the costly ingredients in the production of concrete. However many countries have severe shortage of cement although there requirements are vast. The manufacture of OPC is expensive and skill intensive process, besides polluting the environment heavily production is associated with the emission of carbon dioxide which is a significant source of global warming. Pozzolanic materials are widely used in concrete and mortars for various reasons particularly for reducing the amount of cement required for making concrete and mortar which lead to a reduction in construction cost. This paper presents the results of study under taken to investigate the feasibility of using Supplementary Cementing Materials (SCMs) as partial replacements of cement. The effects of replacing cement by these SCMs on compressive strength, split tensile strength are evaluated in this work. Both compressive and spilt tensile strength is evaluated at 7days, 28 days, 90 days and 180 days.

Keywords

Supplementary Cementing Materials (SCMs), Compressive Strength, Split Tensile Strength, Flyash (FA), Silica Fume (SF), Metakaoline.

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