Abstract
The intention of the present study is to assess the possibility of using Metakaolin as a partial replacement of Portland Pozzolana Cement (PPC) in the concrete to improve its workability and compressive strength. It also explores the study on the connection between ultrasonic pulse velocity (UPV) on different replacement percentage of mineral metakaolin and compressive strength by using a compression testing machine for M40 grade of concrete. Concrete specimens were cast of size 150 mmx150 mm x150mm by partial replacing PPC with metakaolin in the range of 4% to 28 % by the weight of cement. For better consistency and workability the Visco-Flux superplasticizer was used. Usual procedure of water curing of specimens was done for 7, 28, and 90 days to determine the effect of curing time on strength. All 8 different mix specimens were tested for compressive strength and ultrasonic pulse velocity. It was observed that up to 24% metakaolin replacement the strength was increased but after that, the strength gets reduced as compared to the normal concrete and the optimum value of compressive strength was obtained at 16% metakaolin replacement. The increase in the UPV of test samples indicated the formation of the homogeneous structure due to the addition of metakaolin. So the use of metakaolin as a partial replacement of PPC in concrete is a good choice to reduce the cost of production and increase the strength of concrete. A mathematical model is generated by regression analysis in the form of an equation to correlate the compressive strength and ultrasonic pulse velocity.
Highlights
Utilisation of Metakaolin as a pozzolanic binder in concrete blend is widely increased
Metakaolin is very different from other pozzolanic material because it is not the by-product as manufactured underneath carefully controlled environments [1]
Metakaolin has been successfully used for formation of high strength self-compacting concrete (HSSCC) and proved with the help of mathematical modeling [7]
Summary
Utilisation of Metakaolin as a pozzolanic binder in concrete blend is widely increased. Previous studies discovered an enormous interest in metakaolin because it has both micro filler in addition to pozzolanic properties [2,3,4] It improves strength of concrete in early stages of hydration [5, 6]. Due to fineness of metakaolin dose of super plasticizer required is more in MK containing concretes [8] Such concretes help in protecting the environment by reducing carbon dioxide (CO2) and other greenhouse gas emissions related with cement production. These days the non destructive tests (NDT) like Ultrasonic pulse velocity test methods are used for examination of concrete quality. Harden properties of compressive strength test and ultrasonic pulse velocity test were conducted on all the mixes; regression analysis is carried on the values obtained from the result of compressive strength test and ultrasonic pulse velocity test to check their interrelationship among them
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