International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 11 | Nov 2024
p-ISSN: 2395-0072
www.irjet.net
EFFECT OF MICRO SILICA ON THE PROPERTIES OF HARDENED CONCRETE Samir Sarkar1, 1M-Tech Student, Department of Civil Engineering, Maharishi University of Information Technology (MUIT),
Lucknow, Uttar Pradesh, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - In the dynamic field of construction materials,
Furthermore, 94.15% of compressive strength was attained within 7 days. Tao Lou [7] investigated the workability of concrete and found that inclusion of SF by 0%-10%, slump of concrete decreased by 27% and air content reduced by 13.7%. The research also concluded that infusing of 10% SF, resulted in anincrement of compressive and splitting tensile strength by 26.7% & 40.7% respectively. Reni Suryanita [8] recommended to use SF dose at 0.15%-0.5% in the production of cellular light weight concrete (CLWC) to get better result. Vikash Kumar [9], demonstrated that replacement of SF as a substitute of cement is enhanced the concrete properties and found optimum dose of SF as 8% to get maximum result for compressive strength 7% for Split tensile strength and 8% for Flexural strength respectively. Akshay Suryabanshi [10], Conducted trials on concrete with silica fumes of variable doses and reported that the workability of concrete decreases as the proportion of silica fumes increases, besides, increments of compressive strength, tensile strength, and flexural strength are observed when silica fume replacement is about 10%.
the integration of supplementary cementitious materials (SCMs) aimed at improving the mechanical and durability properties of concrete has attracted increasing interest. Among these SCMs, micro silica, also known as silica fume (SF), stands out as a promising candidate. This work presents the function of micro-silica in enhancing concrete performance through a thorough review of the literature and experimental analysis.In-depth research is done on important characteristics like water permeability, chloride permeability, tensile strength, and compressive strength to determine how microsilica affects the mechanical and durability qualities of concrete. Key Words: Supplementary Cementitious Materials, Silica Fume, Compressive strength, Tensile strength, Water permeability, Chloride permeability.
1. INTRODUCTION: As the demand for high-performance concrete escalates in tandem with the burgeoning infrastructural needs of contemporary society, understanding the nuanced effects of microsilica (MS) becomes imperative for advancing the frontiers of construction technology. Chemical composition of MS while infuse with concrete noticed significant changes, more porous of SF has a better ability to broaden the pozzolanic reaction’s range [1]. Cheng Ding [2] demonstrated that adding of SF, improved the microstructure of concrete by bridging gaps and promoting a subsequent hydration reaction. Osma [3] established that adding 45% coconut shell, 1.5% glass fiber and 15% SF increases the compressive strength by 20%, tensile strength by 22%. Inclusion of 20% SF into SCC as a cement substitute did not impact on concrete properties, rather, combine this with steel fiber led to produce a more economical and durable SCC [4]. Adding 5% SF to the OPC-NP (Ordinary Portland cement - Normal Pozzolona) mix did not improve its compressive strength compared to normal OPC concrete for 28 days. OPC-NP-SF concrete has greater compressive strength than OPC concrete after 28 days. Moreover, both OPC-NP and OPC-NP-SF blends decreased drying shrinkage contrasted with OPC concrete, showing the gainful impacts of NP and SF in the progress of shrinkage [5]. Promise D [6] demonstrated that inclusion of SF into Lytag Silica Fume Concrete (LSFC) led to achieve ultimate compressive strain of 2.18% while normal concrete exhibited 3.5%.
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It was evident that, even though the strength properties are improved, further study on higher grade concrete has been conductedand oversaw not only the strength propertiesbut also various durability characteristics, likechloride permeabilityas well aswater permeability for further advancements in their reliability. In this paper, SF is replaced with cementitious materials by a range from 2.5%10% and compare the mechanical and durable properties of concrete with control mix.
2. MATERIALS 2.1
CEMENT
In the present study, Ordinary Portland Cement (OPC) of Ultratech brand of 53 grade confirming to IS: 269-2015 was used. The properties of cement found are shown in Table I: Table 1: Properties of Cement:
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Properties
Unit
Value observed
Fineness Index
(M2 / Kg)
263
Normal Consistency
(%)
26.5
Specific Gravity
-
3.15
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