International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 08 | Aug 2023
p-ISSN: 2395-0072
www.irjet.net
MECHANICAL, DURABILITY AND THERMAL STUDIES USING DIFFERENT BINDERS IN HEMPCRETE G G Subanesh1, V Nivetha 2, Dr. K. NITHYAPRIYA 3 1 PG Scholar, Department of Civil Engineering, Coimbatore Institute of Technology, Tamil Nadu, India
2 PhD Scholar, Department of Civil Engineering, Coimbatore Institute of Technology, Tamil Nadu, India 3 Assistant Professor, Department of Civil Engineering, Coimbatore Institute of Technology, Tamil Nadu, India ---------------------------------------------------------------------***--------------------------------------------------------------------in the reduction of concrete manufacturing costs.[11] This Abstract - The construction industry has shown significant
research aims to explore the potential of pozzolans, finely divided siliceous and aluminous materials that react with lime in the presence of water to form cementitious properties, as a suitable addition to lime-hemp concrete. By formulating a binder using only hydrated lime and pozzolans, the study seeks to create a more environmentally friendly alternative to imported commercial binders or on-site cement-based binders. Parameters influencing the mechanical behavior of the hemp-based material:
interest in Hempcrete, an eco-friendly composite material, due to its minimal environmental impact and promising thermal insulation characteristics. However, the effectiveness of Hempcrete relies heavily on the choice of binders employed to bind the hemp fibers together. This research paper seeks to examine the mechanical strength, longevity, and thermal properties of different Hempcrete samples formulated with a variety of binders. The study involves the creation of distinct Hempcrete specimens, each utilizing a different type of binder. By conducting mechanical assessments, such as compressive and flexural strength tests, a comparative analysis is performed. Additionally, measurements of thermal conductivity and thermal resistance are conducted to evaluate the insulation efficiency of each binder variation. The primary objective of this study is to pinpoint the most suitable binder that offers optimal mechanical performance, improved durability, and superior thermal insulation in Hempcrete applications. The insights gained from this investigation are anticipated to provide valuable information to the construction sector, promoting the responsible and eco-conscious utilization of Hempcrete as a viable and sustainable construction material.
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The objectives of the research include examining the chemical and physical properties of nine selected pozzolans to identify the most appropriate ones for incorporation into lime-hemp concrete.[2] Additionally, the study will investigate methods to minimize any delays in setting and early strength development caused by hemp in the lime-pozzolan binder. Comparative analysis of the microstructure and crucial physical properties of the resulting concrete, utilizing the lime-pozzolan binder, will be conducted against binders containing cement and commercial binders.
Key Words: Hempcrete, binders, lime, mechanical strength, durability, thermal properties, sustainable construction, thermal insulation
The hydration and carbonation reactions of the binder cause an increase in the density of the specimens and therefore in the thermal conductivity of the hemp concretes. The material is then a less effective insulator.[3] Ultimately, this research endeavours to enhance the properties of lime-hemp concrete, making it a more viable and sustainable option for eco-friendly construction, while reducing the environmental impact associated with traditional binders. Hemp shivs used in lime-hemp concrete must be properly processed and pre-treated. The shivs are usually cut or crushed to the desired size and cleaned of dust and impurities. The pre-treatment ensures that the shivs are compatible with the lime binder and that the final material exhibits the desired properties.[6]
1.INTRODUCTION Lime-hemp concrete, composed of a lime-based binder, hemp, and water, is an environmentally sustainable and carbon-negative building material commonly used alongside load-bearing frames due to its lightweight and non-structural nature. However, its low strength, typically ranging from 0.05-1.2 MPa in compressive failure and 0.06-1.2 MPa in flexural strength, has been a subject of investigation by various researchers.[9] The properties of the composite depend on binder type, aggregate to binder ratio, size and porosity of the aggregates, and level of compaction.[7] The use of waste materials not only helps to get them used in cement, concrete, and other building materials, but it also offers a number of indirect advantages, such as lower inland fill costs, energy savings, and environmental protection from pollution. It also aids
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