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2012 - 20182
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Subject: Civil Engineering × Author: Kamaldeep Kaur × End date: 2020 ×
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    Experimental investigation on rice husk ash-based geopolymer mortar containing nano-metakaolin
    (Punjab Agricultural University, Ludhiana, 2018) Kamaldeep Kaur; Jaspal Singh
    Geopolymer is new class of cementitous materials, synthesized by mixing the almino-silicate sources with alkaline activating solution. It is an eco-friendly innovative alternative to cement which utilized various waste materials that are not reused in industries and urgent to dispose of. The rice husk ash is an agricultural waste which is suitable for geopolymerisation. In this study, influence of nano-metakaolin on rice husk ash based geopolymer has been investigated. Eighteen mixes of geopolymer were prepared with three different molar concentrations of alkaline activator (12M, 14M and 16M) and different proportion of nanometakaolin (0% to10% @2% increment). Thee compressive strength was tested after 3, 7, 14 and 28 days of curing. The X-ray diffraction test was performed on the rice husk ash, powdered sample of mixes K1, K7, K13 & K16. The powdered samples were collected from remnants of geopolymer after 28 days compressive strength test. The Results reveal that compressive strength of geopolymer increases for all curing ages when the concentration of alkaline activator is raised from 12M to 16M but the proportion of nano-metakaolin increases the strength up to certain limit. Beyond that there was reduction in compressive strength. The compressive strength results were accomplished by X-ray diffraction analysis. The geopolymer mortar prepared using 16M concentration of alkaline activator and 6% proportion of nano-metakaolin is recommended for the maximum compressive strength.
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    TO STUDY THE PERFORMANCE OF CONCRETE CONTAINING METAKAOLIN AND POLYPROPYLENE FIBRE
    (Punjab Agricultural University, Ludhiana, 2012) Kamaldeep Kaur
    Concrete is a versatile construction material. For more durable and strong structures, the concrete of high strength is required. To make concrete more strong, pozzolans are added to concrete. Metakaolin ( MK ) is a pozzolana used to achieve the required strength. The present study investigates the characteristics strength of concrete due to partial replacement of cement by MK and addition of polypropylene fibres (PPF). M30 concrete was designed according to BIS guidelines. The investigation was carried out on concrete containing MK and PPF at various proportions of 0%, 7%, 8% and 9% of MK and 0%, 0.2%, 0.5% and 0.8% of PPF. Fly ash (10%) and superplasticizer (0.7%) has been added to improve the workability of concrete. In present study, the results of X-ray diffraction (XRD) analysis of concrete containing metakaolin and fly ash were analysed. Analysis of cement, metakaolin and fly ash was done with XRD. Samples K0, K4, K8 and K12 containing 0%, 7%, 8% and 9% MK (by weight of cement) respectively at the sample age of 1 day were also analysed with XRD. It has been observed that addition of MK and PPF showed considerable improvement in the strength of concrete especially at the early age of concrete. Further it has been observed that optimum gain in compressive strength is at 8% of MK and 0.8% of PPF. Results of XRD supplement with the results obtained from compressive strength test.