International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 04 Issue: 07 | July -2017
p-ISSN: 2395-0072
www.irjet.net
STRENGTH CHARACTERSTICS OF SELF COMPACTING CONCRETE WITH PARTIAL REPLACEMENT OF CEMENT BY MINERAL ADMIXTURES USING POLYPROPYLENE FIBERS Suhas K S1, Raghavendra D2 1Post
Graduate Student, Department of Civil Engineering, East Point College of Engineering and Technology, Bangalore, India 2Assistant Professor, Department of Civil Engineering, East Point College of Engineering and Technology, Bangalore, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - This paper focuses on the experimental investigation of strength parameters such as Compressive strength, Split tensile strength and Flexural strength of M40 grade concrete for 7 and 28 days curing period using mineral admixtures and Polypropylene Fibres. Moreover, Utilization of mineral admixtures in SCC not only reduces cost but also reduces the heat of hydration. Optimum dosage of super plasticizer is added to ensure workability of SCC. Various workability tests (Slump Flow, V-Funnel, U-box and L-box) were performed as specified in EFNARC Guidelines. The mix design was carried out according to Nan Su method. In this study Cement was partially replaced by Ground Granulated Blast furnace slag (GGBS) 10% and 15%, Fly ash 10%, 15% and 20% and Alccofine 10% in one mix at a time in different proportions along with Polypropylene. Key Words: Self Compacting Concrete, Strength Properties, Mineral Admixtures, Polypropylene, Microstructure of concrete.
1. INTRODUCTION Self-compacting concrete is the one which can flow on its own weight without any vibration. Self-compacting concrete was initially introduced by japan in 1990’s due to lack of skilled workmen. It doesn’t need any vibration at the time of placing of concrete. Due to its workability properties, SCC can be used even in the dense reinforcements. In modern scenario, the use of high strength concrete is rapidly increasing because of its higher strength and better workability properties than conventional concrete for the same grade of concrete. Many research and development programs are undertaken to improve its strength and durability properties by replacing constituents of concrete by many other alternative materials like Industrial waste, Agro industrial waste and various types of mineral admixtures.One of main difference between conventional concrete and SCC is use of superplasticizers and in SCC cement and fine aggregate quantity will be more when compared to normal concrete. Polypropylene fibres were added to concrete in order to increase the strength characteristics like compressive strength, split tensile strength and flexural strength slightly. Mineral admixtures © 2017, IRJET
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like Ground granulated blast furnace slag (GGBS), Fly Ash and Alccofine are added so that concrete can be economical.
2. OBJECTIVE The main objective of this research work is to find the strength characteristics such as Compressive strength, split tensile strength and flexural strength of self compacting concrete with and without polypropylene fibers separately for different mixes where cement is partially replaced by various mineral admixtures and to study microstructure using Scanning Electron Microscope of those mixes.
3. MATERIALS All the materials used for the project like cement, fine aggregate, coarse aggregate, water, GGBS, fly ash, alccofine, superplasticizer are tested for basic material test. Cement: OPC 53 Grade Fine Aggregates: River sand Coarse Aggregates: 12.5 mm size Mineral Admixtures: Ground Granulated Blast Furnace Slag (GGBS), Class F Fly Ash and Alccofine 1203 Superplasticizer: MasterGlenium SKY 8630 Polypropylene Fibres of effective diameter 25 – 40 microns
3.1 Workability Properties of concrete Self Compacting Concrete should satisfy certain fresh concrete properties like Filling ability, Passing ability and segregation resistance. there are various test to test those properties namely slump flow test, V funnel test, U box test, J ring test, Orimet, L box and fill box test. Superplasticizer dosage is kept as 1% in concrete without polypropylene where as in concrete with polypropylene superplasticizers dosage is increased to 1.5% to meet the requirements of EFNARC guidelines.
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