Studi Pengaruh Penggunaan Nano Kalsium Karbonat Sebagai Aditif Terhadap Sifat Fisik Semen Pemboran Kelas G

Sahiddin, M (2021) Studi Pengaruh Penggunaan Nano Kalsium Karbonat Sebagai Aditif Terhadap Sifat Fisik Semen Pemboran Kelas G. Other thesis, Universitas Islam Riau.

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Abstract

The use of macro and micro additives in cement still causes many problems, such as the presence of homogeneous micropores. These events can reduce the quality of cement, causing fluid loss, the formation of free water and cement becomes more brittle. To fill in the micropore gaps while increasing the strength of the cement, nanoscale additives are needed. Nano CaCO3 is used because it has the ability to accelerate reactions to form hydration products that can reduce pore diameter and will also make cement have a denser structure. This study conducted a test to determine the effect of adding nano CaCO3 with various concentrations of 0.1%, 0.3% and 0.5% bwoc on filtration loss, free water, compressive strength and shear strength. Tests are carried out in accordance with procedures that reference to API 10A standards. Nano CaCO3 was characterized using SEM-EDS to see its morphology and elemental content. The results of SEM nano characterization of CaCO3 show that CaCO3 nanoparticles have almost the same shape, namely spherical. EDS results show that nano CaCO3 has a dominant element, like Carbon (C) 41.05% Mass, Oxygen (O) 45.56% Mass, and Calcium (Ca) 12.42% Mass. Nano CaCO3 additives with various concentration of addition have an effect on the value of filtration loss, free water CS and SBS for G class drilling cement along with the increase in the concentration of nano CaCO3 additives. The optimum value of cement compressive strength obtained from various concentration of adding nano CaCO3 is 5168.38 psi for compressive strength and 917.129 psi for shear bond strength with the same concentration, namely 0.5% nano CaCO3 bwoc + 5% KCl bwow. The optimum value of filtration loss obtained from the various concentration of the addition of nano CaCO3 is 188.08 ml/30 minutes with 0.5% of nano CaCO3 bwoc. The optimum value of free water obtained from the variation in the concentration of the addition of nano CaCO3 is 0.1 ml with 0.5% of nano CaCO3 bwoc.

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