Research Paper
Year: 2019 | Month: August | Volume: 6 | Issue: 8 | Pages: 164-167
Study on Effect of Mineral Admixtures in High Performance Concrete
S Poojitha1, M K M V Ratnam2, P J D Anjaneyulu3
1Department of Civil Engineering, 2Department of Civil Engineering,
DNR College of Engineering & Technology, Bhimavaram, Andhra Pradesh.
Corresponding Author: S Poojitha
ABSTRACT
High - performance concrete (HPC) is fast getting acceptability for a wide range of applications in the construction of concrete structures. It is a tailor made material for specific applications and having advantageous properties like high strength, high durability and high constructability as compared to the conventional type of normal strength concrete. To produce such a high performance concrete, mineral admixtures like silica fume, metakolin and fly ash on the one hand and super plasticizer on the other hand used along with normal ingredients. The use of mineral admixtures in concrete enhances its properties regarding strength, durability, workability and economy.They act as pozzolanic materials as well as micro fillers; thereby the microstructure of hardened concrete becomes denser and stronger. Superplasticizers being surfactant in nature, help to disperse the cement particles in the mix and thus enhance the fluidity of the mixes at low water binder ratio.
The scope of the present study is to investigate the effect of mineral admixtures such as silica fume, metakolin and fly ash towards the performance of HPC. An effort has been made to focus on the mineral admixtures towards their pozzolanic reaction, contribution towards strength properties, mix proportioning, and self-compactability.
The strength characteristics such as compressive strength and tensile strength are investigated with different water binder ratios (w/b) at different ages to find the optimum replacement of mineral admixtures. The compressive strength of HPC with mineral admixtures at the replacement levels of 0%, 5%, 10% and 15% were studied at 7 days, 28 days, 56 days and 90 days of curing. The strengths were compared and the optimum replacement level of each mineral admixture was arrived at. The tensile strength and flexural strength of HPC were obtained at the same replacement levels of mineral admixtures at 28 days curing.
Key words: HPC, silica fume, Metakaolin, fly ash.
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