International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 08 | Aug 2024
p-ISSN: 2395-0072
www.irjet.net
Enhancing concrete performance and sustainability with lignin VISHAL SAGAR, MANJUNATH K, AVINASH ------------------------------------------------------------------------***------------------------------------------------------------------------ABSTRACT This study investigates the incorporation of lignin, an industrial byproduct, as a partial replacement for cement in M20 concrete. Lignin content was varied (10%, 20%, 30%, 40%) to evaluate its impact on workability, compressive strength, tensile strength, self-healing properties, and water permeability. The results indicate that lignin content up to 20% enhances workability, maintains or improves strength, significantly boosts self-healing capabilities, and reduces water permeability, thus enhancing the overall durability of concrete. However, higher lignin contents (30-40%) lead to reduced mechanical properties and increased permeability. The environmental benefits of using lignin, including reduced carbon footprint and sustainable waste utilization, are also highlighted. The study concludes that optimal lignin incorporation (10-20%) can improve the performance and sustainability of concrete, making it a viable alternative in construction practices. Future research should focus on long-term performance, economic feasibility, and the effects of different lignin types to further optimize its use in concrete production. Key Words: Lignin, Concrete performance, Self-healing properties CHAPTER 1
INTRODUCTION 1.1 Introduction to Concrete and its Advanced Properties Concrete, a ubiquitous and indispensable material in modern construction, is a composite substance made primarily from a mixture of cement, aggregates (such as sand, gravel, or crushed stone), and water. Its widespread use is attributable to its versatility, durability, and cost-effectiveness. As the backbone of infrastructure and construction projects, concrete's properties and performance are of paramount importance. The development and enhancement of these properties can considerably influence the structural integrity, longevity, and environmental sustainability of concrete structures. In this introduction, we will delve into several critical aspects of concrete, namely the binding agent, hydration control, self-healing mechanism, reduction of permeability, and environmental benefits. Understanding and optimizing these properties are vital for advancing concrete technology and meeting the difficulties of current construction. 1.2 Binding Agent In Concrete the binding agent is primarily cement, most commonly Portland cement. Cement acts as the glue that holds the aggregate particles together, providing the matrix that binds the mixture into a solid, cohesive mass. After water is added to cement, a chemical reaction termed hydration occurs, leading to the creation of a solid, stone-like material. Importance in Concrete 1) Structural Integrity: The binding agent is fundamental to the structural integrity of concrete. Strong bond among the cement and aggregate particles ensures that the concrete can resist compressive forces and loads. 2) Workability and Plasticity: The binding agent properties are significantly impact on the fresh state workability of the concrete mix. A proper balance allows for easier mixing, placement, and concrete finishing. 3) Durability: The quality and arrangement of the binding agent impact the long-term concrete in terms of durability. A well-formulated binding agent helps in resisting environmental degradation, chemical attacks, and physical wear. 1.3 Hydration Control Hydration control involves managing the chemical reaction between cement and water. This response is vital for the setting and hardening of concrete. The hydration process is exothermic, releasing heat as the cement elements respond with water to form calcium hydroxide and (C-S-H) calcium silicate hydrate.
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