International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 12 Issue: 01 | Jan 2024
p-ISSN: 2395-0072
www.irjet.net
The Impact Of Fly Ash And Silica Fume On The Characteristics Of High-Performance, Self-Compacting Concrete. Suryapratap Biswajit Puhan Assistant Professor, Dept. of Civil Engineering, MITM Bhubaneswar, Odisha, India ---------------------------------------------------------------------***--------------------------------------------------------------------sufficient self-compactability (filling, passage, and Abstract - To increase compressive strength, tensile
segregation resistance) of the SCC. SCHPC compacts without vibration, which speeds up construction and saves a lot of money. However, its production costs are unaffordable because of its high cementitious content and chemical admixtures.
strength and promote the environmentally friendly use of fly ash (FA) produced in Malaysia, the study explores the feasibility of replacing fly ash (FA) and silica fume (SF) for ordinary Portland cement (OPC) in selfcompacting high-performance concrete (SCHPC). OPC was partially replaced by 0%, 25%, 40%, 50%, 65%, and 75% FA in six SCHPC mixes studied; SF replacement remained constant at 10%. The w/b ratio was fixed at 0.31. According to EFNARC for self-compacting concrete, fresh qualities were tested using slump flow, L-Box, and V-funnel tests. The compressive strength tests were carried out on 100 mm² cubes after 7 and 28 days of curing. The ideal mixture of 40% OPC, 50% FA, and 10% SF had a compressive strength at 28 days of 87.06 MPa, which was 5% higher than the control mix's 82.39 MPa. This exemplifies a practical and long-term approach to enhancing the performance of SCHP.
However, a review of the literature indicates that labour cost savings and the use of mineral admixtures like FA and SF in the SCHPC production process may significantly lower the production cost. Furthermore, it is well known that the combination of FA and SF in a ternary blend enhances the qualities of concrete and makes SCHPC more ecologically friendly. Whereas SF is a byproduct of the smelting process in the silicon and ferrosilicon industries, FA is a byproduct of burning pulverized coal in power plants that generate energy. Coal-fired power plants are used in Malaysia to produce electricity. Burning coal ash, the Tanjung Bin power plant, one of Malaysia's four coal-powered power plants, generates 42,000 metric tons of FA monthly [5]. As Malaysia's anticipated need for coal to generate energy rises in 2020, it is anticipated that FA output would rise as well. One affordable and easily accessible fossil fuel is coal. According to reports, a 25% FA substitution for cement results in a 20% reduction in construction expenses. There isn’t many research in the literature on the mechanical properties of SCHPC that incorporate class F FA and 10% SF. The goal of this work is to close this gap.
Key Words: Self-compacting high-performance concrete, Fly ash Compressive strength, Silica fume, Portland cement, STS.
1.INTRODUCTION With growing environmental consciousness and the need to lessen the harmful consequences of industrial wastes, the use of industrial by-products has accelerated recently [1]. The viscous mixture known as self-compaction concrete (SCC) is ideal for casting complex structures and constructions with crowded reinforcement, either with or without a small amount of vibration, while preserving a steady flow devoid of bleeding and segregation [2]. Okomora started the concept of SSC in 1986, and Tokyo University expanded on it in 1988 to create long-lasting concrete structures and raise standards in the building sector [3]. Abrasionresistant and long-lasting, high-performance concrete (HPC) is created with a low water-to-binder ratio (w/b) and properly cured [4].
In their investigation of the mechanical characteristics of SCC, Askari et al. [6] find that a large volume FA concentration increases compressive strength between 28 and 120 days of curing, confirming the persistence of FA's pozzolanic activity over time. Additionally, SCC with high volume FA retains and increases its tensile strength when 10% SF is substituted for cement. Askari et al. [6] conclude that because FA particles are spherical, high-volume FA reduces the amount of superplasticizer (SP) needed to achieve self-compactability. Similarly, Wongkeo et al. [7] investigate the effects on SCC's compressive strength and chloride resistance of substituting Portland cement with 50, 60, and 70 weight percent high calcium class C FA and SF. They discovered that when Portland cement is substituted in large quantities,
High strength, durability, and fluidity are characteristics of HPC. Similar components make up both SCC and HPC, and when properly proportioned, they provide the necessary classes of concrete. Therefore, SCHPC is a new tangible generation that is founded on the ideas of HPC and SCC. It has the high strength and good durability of the HPC and the
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