Presentation Title

Investigation of Mechanical Properties in HPC Using Natural Zeolite

Start Date

November 2016

End Date

November 2016

Location

Watkins 1111

Type of Presentation

Oral Talk

Abstract

Due to severe weathering problems in nation’s concrete infrastructures namely bridges and pavements, it has become very important to develop high performance concrete (HPC). HPC generally increases the durability against the chloride induced corrosion as well as long term strength. Currently, a natural pozzolanic cementitious material known as natural zeolite is being used for enhancing the performance of HPC. Natural zeolite, a crystalline hydrated alumino-silicate processed (volcanic ash) mineral that has a unique three-dimensional honeycomb framework, is widely used as partial replacement for cement in concrete all around the world. The purpose of this study is to investigate modulus of elasticity, which is related to durability and strength, of zeolite based HPC mixtures to enhance the performance and serviceability of reinforced concrete bridges and pavements. Modulus of elasticity is defined as slope of strain and stress curve within an elastic deformation region. In this study, several HPC mixtures are prepared by replacing cement with different percentage level of zeolite replacement (10%, 15%, 20%, 25%, and 30%). Several binary (Cement + Zeolite) and ternary (Cement + Zeolite + other cementitious material) based concrete mixtures including the control mixture (100% Portland Cement) with water to total cementitious material ratio of 0.4 and 0.44 are investigated. Three different types of testing namely modulus of elasticity, compressive strength and tensile strength are conducted at 7, 28, 56 and 91 days on 4in x 8in concrete cylinder samples. The compressometer is utilized for measurement of modulus of elasticity indirectly through evaluating deformation and strain of concrete samples. Universal Testing Machine (UTM) is used to measure the compressive and tensile strength of concrete at 7, 28, 56 and 91 days. Most Department of Transportations (DOTs) in the USA recommend a minimum compressive strength of 4000 psi at 28 days since it plays a major role in designing the concrete infrastructures. Overall, zeolite based concrete mixtures with water to total cementitious material ratio (W/C) at 0.40 provides promising results in terms of modulus of elasticity, compressive strength and tensile strength. Further, substitution of zeolite with cement in concrete mixtures, will reduce carbon dioxide (CO2) emission and promotes sustainability.

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Nov 12th, 11:30 AM Nov 12th, 11:45 AM

Investigation of Mechanical Properties in HPC Using Natural Zeolite

Watkins 1111

Due to severe weathering problems in nation’s concrete infrastructures namely bridges and pavements, it has become very important to develop high performance concrete (HPC). HPC generally increases the durability against the chloride induced corrosion as well as long term strength. Currently, a natural pozzolanic cementitious material known as natural zeolite is being used for enhancing the performance of HPC. Natural zeolite, a crystalline hydrated alumino-silicate processed (volcanic ash) mineral that has a unique three-dimensional honeycomb framework, is widely used as partial replacement for cement in concrete all around the world. The purpose of this study is to investigate modulus of elasticity, which is related to durability and strength, of zeolite based HPC mixtures to enhance the performance and serviceability of reinforced concrete bridges and pavements. Modulus of elasticity is defined as slope of strain and stress curve within an elastic deformation region. In this study, several HPC mixtures are prepared by replacing cement with different percentage level of zeolite replacement (10%, 15%, 20%, 25%, and 30%). Several binary (Cement + Zeolite) and ternary (Cement + Zeolite + other cementitious material) based concrete mixtures including the control mixture (100% Portland Cement) with water to total cementitious material ratio of 0.4 and 0.44 are investigated. Three different types of testing namely modulus of elasticity, compressive strength and tensile strength are conducted at 7, 28, 56 and 91 days on 4in x 8in concrete cylinder samples. The compressometer is utilized for measurement of modulus of elasticity indirectly through evaluating deformation and strain of concrete samples. Universal Testing Machine (UTM) is used to measure the compressive and tensile strength of concrete at 7, 28, 56 and 91 days. Most Department of Transportations (DOTs) in the USA recommend a minimum compressive strength of 4000 psi at 28 days since it plays a major role in designing the concrete infrastructures. Overall, zeolite based concrete mixtures with water to total cementitious material ratio (W/C) at 0.40 provides promising results in terms of modulus of elasticity, compressive strength and tensile strength. Further, substitution of zeolite with cement in concrete mixtures, will reduce carbon dioxide (CO2) emission and promotes sustainability.