International Research Journal of Engineering and Technology (IRJET) Volume: 09 Issue: 07 | July 2022
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e-ISSN: 2395-0056 p-ISSN: 2395-0072
SHRINKAGE PROPERTIES OF CEMENT CONCRETE INCORPORATED WITH DIFFERENT SUPPLEMENTARY CEMENTITIOUS MATERIALS-A Review Chris Philip1, Jerison Scariah James2, Dr. Elson John3 1 Chris
Philip, M.Tech Student, Department of Civil Engineering, Mar Athanasius College of Engineering, Kothamangalam 2Jerison Scariah James, Research Scholar, Department of Civil Engineering, Mar Athanasius College of Engineering, Kothamangalam 3Dr. Elson John, Professor, Department of Civil Engineering, Mar Athanasius College of Engineering, Kothamangalam ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract -Through its lifespan, concrete undergoes several
due to the interaction of the elements and parameters determining the emergence and spread of cracks in concrete. The development of thermal stresses, creep, and crack formation could be some of the key nonlinear phenomena that control the shrinking behaviour of young concrete.
physical and chemical changes, which normally led to shrinkage of concrete, especially at an early age, when the initial hydration processes take place. The shrinkage of concrete at an early stage of hardening may lead to the initial formation of cracks that vary in shape and size and depends on the concrete constituents and surrounding conditions, including temperature and/or the moisture state that may lead to volumetric deformation Many studies have shown that the total prevention of concrete from undergoing shrinkage is impractical. However, different practices have been used to control various types of shrinkage in concrete and limit its magnitude. This paper provides the shrinkage behavior of cement concrete incorporated with different mineral admixtures and fibers.
These issues with producing conventional concrete resulted in a greater demand for nonconventional concretes that perform better in terms of strength as well as a more resilient mixture that offers better shrinkage resistance. The behaviour of concrete's shrinkage and the governing factors affecting its various types of shrinkage, including chemical shrinkage, plastic shrinkage, drying shrinkage, carbonation shrinkage, and thermal shrinkage, have been the subject of numerous numerical or experimental studies in recent years. The results of these research shown that environmental factors, aggregate type, cementitious materials, water/cement ratio, and chemical admixtures all have an impact on the shrinkage properties. The resistance of many types of concrete to shrinkage and the emergence of fractures has been shown to be improved by several cementitious substitutes, such as flyash [3-5]. Given all these influences on shrinking behaviour, a thorough review paper that compiles and analyses recent data in the literature is required. Therefore, the purpose of this work is to review and contrast earlier studies on the concrete shrinkage behaviours.
Key Words: Plastic Shrinkage, Autogenous Shrinkage, Drying Shrinkage, Fly ash, silica fume
1. INTRODUCTION Concrete experiences a number of physical and chemical changes during the course of its lifetime, which often cause concrete to shrink, particularly when it is young and the first hydration processes are still taking place. Based on the components of the concrete and the environment, including temperature and/or moisture levels that may cause volumetric deformation, the shrinkage of concrete during the early stages of hardening may result in the initial creation of cracks that vary in shape and size. Due to the imposed force on concrete particles, shrinkage cracking forms while the concrete is still in the plastic condition and persists through the hardened stage. These stresses are brought on by the consumption of the water used to make the cement paste, which occurs after the water present in the pores is lost. It is almost certain that the concrete texture will shrink and develop cracks.
2. TYPES OF SHRINKAGE Major types of shrinkages that can occur over the maturity process and life span are classified as autogenous, plastic, drying, carbonation and thermal.
3.1 Autogenous Shrinkage Autogenous shrinkage, in general, can be defined as the portion of shrinkage that does not involve any volume change caused by material loss or ingress, temperature variation, application of an external force, or restraint. Because of this, it is also known as self-desiccation shrinking.
In brittle materials, cracks often appear when the tensile stress exceeds the rapture strength. It is challenging to isolate the effect of each component separately, however,
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