International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 05 | May 2023
p-ISSN: 2395-0072
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MECHANICAL CHARACTERISTICS OF RECYCLED AGGREGATE AND MINERALS ADMIXED HIGH-PERFORMANCE CONCRETE Minakshi Tomar, M.tech student., Dept. of Civil Engineering, Radha Govind engineering college, Dr A.P.J. Abdul kalam technical university, Uttar Pradesh, India. ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - In this research paper, we have studied the effect
development principles and maximizing the recycling of construction waste through research and development is necessary. One potential outlet is the use of recycled aggregates in concrete construction.
of recycled aggregates and minerals in physical characteristics on high-performance concrete (HPC) when mixed in it. The present study consists of and considered the effect of many properties of concrete components which are not taken into account by the traditional mix design method. The suggested mix design process follows the rule and regulations of the (BIS) Bureau of Indian Standards as well as the American Concrete Institute (ACI).
Concrete is typically made by using alluvial river sand and chorused crushed gravel, which are abundant and relatively inexpensive to process. These materials produce high-quality concrete due to their physical properties such as size and shape. However, these deposits were formed over millions of years and are not easily replenished. There is currently a shortage of sand and over-mining can cause environmental problems and damage to groundwater reserves. As a result, some state governments have banned sand mining due to concerns such as the danger of excessive digging from the riverbed, the impact on groundwater levels caused by deep pits, and erosion of surrounding land due to excessive sand lifting. It is generally believed that excessive lifting of sand around sub-constructions endangers the safety of bridges, especially the well foundation.
The analysis of recycled aggregate (mostly demolished concrete) as a substitute for natural aggregates admixed with minerals, “silica fume” has been done based on an experiment conducted on HPC. M60 mix design is used in this study. At first, different materials used for making HPC are identified and later then with the help of mix design code, proportional quantities of materials are to be found. The proportions of silica fume in HPC are taken as 0, 10, 12, 15, 17.5, and 20 percent with cement content as 0, 0.5, 0.75, 1, 1, 1.25, and 1.5 percent fume silica. Two different minerals silica fume and fumed silica were used in experiment.
1.1 NEED OF HPC:
Cube compressive strength test at different (w/b) ratios 0.28, 0.3, 0.32 at different ages, such as 3, 7, 14, 28, 56, and 90 days.
Since ancient times, cement materials have been used in construction works. During past fifty - forty years, materials have aged significantly and In present times, because of recurring natural disasters and structure failures, a modern solution is needed to be found. To fulfill the purpose of improving the strength and durability of structures, Highperformance concrete was invented by use of water-reducing admixture, which leads to high strength. High-performance concrete (HPC) is designed to have superior chemical and physical characteristics compared to traditional design mix concrete.
Key Words: High-Performance concrete, recycled aggregate, plasticizers, silica fume, fumed silica
1.INTRODUCTION: Concrete is the main component used for infrastructure development, most of the structures are made by reinforced concrete in India. In modern times when high rise structures are in trend as well as in need, to provide more living room for the increasing world population, especially in India. High rise and heavy-duty structures can’t be constructed with standard concrete mix, for which design of HPC is required, high performance concrete have a compressive strength of 55MPa or more. More construction work requires more construction materials, and construction land for that purpose. In the nowadays skyscraper buildings and heavy transportation bridges, and high-rise water retaining structures like dams are been constructed, because of that there is considerable focus on research and development of high-performance concrete. Furthermore, there is a need to find new sources of aggregates due to the increased demand and reduction in natural resources. Sustainable building
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High-performance concrete not only has high compressive strength but also has excellent flexural and tensile strength, it has a high modulus of elasticity which means less deformation under stress application. HPC structures are less susceptible to liquid-like “chemical and water” penetration due to their low permeability. 1.2 ROLE OF MINERALS AND ADMIXTURES: 1.
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Mineral mix like calcium hydroxide (CH) of silica fume and fumed silica are used to alleviate the unwanted negative effects during the cement
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