Pengaruh Variasi Konsentrasi Nano Kalsium Karbonat Terhadap Shear Bond Strength Dan Compressive Strength Semen Komposit

Purba, Ronaldo Jeremy (2021) Pengaruh Variasi Konsentrasi Nano Kalsium Karbonat Terhadap Shear Bond Strength Dan Compressive Strength Semen Komposit. Other thesis, Universitas Islam Riau.

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Abstract

The strength of the basic cement has been successfully increased through the addition of various additives; including calcium chloride, sodium chloride, sodium nitrate and fly ash. Cement with that additives generate problems such as micropores that will degrade the quality of cement. To fill the micropores as well as improve the quality of cement a nanoscale additives was used. Nano CaCO3 is used because it is able to react and form calcium silicate hydrate (C-S-H) also can act as nanofillers, so cement has small pores and denser structures. This study varied the concentration of nano CaCO3 in bamboo leaf ash composite cement using percentage of 25% BWOC and 0.25%, 0.20%, 0.15%, 0.10%, 0.05% BWOC of nano CaCO3. This research includes shear bond strength and compressive strength testing by soaking cement molds in waterbath at 60°C for 24 hours at atmospheric pressure. Free water testing is done by leaving the cement suspension in a measuring glass for 2 hours, then measure the volume of free water. Nano CaCO3 is characterized using SEM-EDS to see the morphology and content of its elements. Based on the results of laboratory tests, when smaller concentration of nano CaCO3 is added, shear bond and compressive strength value would increase. The optimum value of shear bond strength is 609.58 psi, and compressive strength is 3095.4 psi that obtained when adding 0.05% of nano CaCO3. From free water testing, when smaller concentration of nano CaCO3 used, generate a lot of free water value. The smallest free water value is 0.3 ml was obtained in the addition of 0.25% nano CaCO3. The results of characterization SEM nano CaCO3 showed a uniform particle shape that is spherical, nano CaCO3 containing element such as: Carbon (C) 41.05%, Oxygen (O) 45.56%, Calcium (Ca) 12.42%. From measurements using image-J software, it was found that the average diameter of nano CaCO3 was 66 nm

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