Abstract
Need of construction is increasing due to increase in population growth rate. The geopolymer concrete is eco‐friendly than ordinary concrete. Current experimental investigation was conducted on ordinary and geopolymer concrete using nondestructive testing (NDT) tests like ultrasonic pulse velocity (UPV) test and rebound hammer (RH) test. Cube specimens of dimensions 150 mm × 150 mm × 150 mm are used to conduct these tests at 7, 14, and 28 days. Proportions considered for concrete are cement‐fly ash‐river sand (100‐0‐100% and 60‐40‐100%), cement‐fly ash‐robo sand (100‐0‐100% and 60‐40‐100%) whereas geopolymer concrete fly ash‐metakaolin is taken in proportions of 100‐0%, 60‐40%, and 50‐50%. Alkaline activators (sodium hydroxide and sodium silicate with molarity 12M) were used in preparing geopolymer concrete. The major objective of the current study is to obtain relation between compressive strength of concrete and UPV values.
Highlights
Nondestructive testing (NDT) is an approach for reviewing, testing, or analyzing the elements or components on concrete and concrete members. e major purpose of NDT is to evaluate integrity and quality of concrete members without causing any damage to its functionality and integrity [1]
ultrasonic pulse velocity (UPV) testing machine and rebound hammer are the equipment used for compressive strength evaluation [15, 20, 22]
Where y is the concrete compressive strength and xis the velocity value of concrete. For this present experimental investigation, an equation is determined for comparison of compressive strength and UPV values obtainedare as follows: (i) e UPV and rebound values increase with increase in the curing period
Summary
Nondestructive testing (NDT) is an approach for reviewing, testing, or analyzing the elements or components on concrete and concrete members. e major purpose of NDT is to evaluate integrity and quality of concrete members without causing any damage to its functionality and integrity [1]. Nondestructive testing (NDT) is an approach for reviewing, testing, or analyzing the elements or components on concrete and concrete members. Acoustic Tap Testing was one of the methods of NDT used earlier to nineteenth century, to detect cracks in railroad wheel [2]. NDT is majorly used to test the structural components of a structure for ensuring safety and serviceability. NDT surface hardness methods are used to identify the material’s strength characteristics. Indentation method and rebound hammer method are the two groupings used to identify concrete surface hardness [4]. Rebound or Schmidt hammer is another nondestructive testing equipment. It is used for finding the concrete or rock strength and elastic property. Impacting the hammer on smooth concrete block or rock surface at right angles, the rebound number is obtained
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