ANALYSIS OF THE ELECTRICAL RESPONSE OF KARANGNUNGGAL BENTONITE TO CURRENT VARIATION UNDER WATER CONTENT AND CHEMICAL CONTENT VARIATION FOR GROUNDING APPLICATIONS

• Main Author: Izzatur Rahman Noor, Zakka
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/55425
• Institution: Institut Teknologi Bandung

In this thesis, research is conducted on the interaction of bentonite with DC, AC, and impulse currents with different moisture levels and chemical contents. The results obtained are that on the DC test, the higher the water content and chemical content, the resistivity is decreased. Based on all DC test, the addition of HCl can produce the lowest resistivity. Then successively the addition of NaCl, addition of NaOH, and changing the water content value increases the resistivity value which is increasing. This occurs because increased water content and chemical content can increase the conductivity of bentonite. In AC, the higher the water content and chemical content for each variation, the lower the average resistivity of the AC tester. In general, NaOH provides the lowest resistivity. NaCl provides the highest resistivity, followed by HCl and then moisture. The trend in resistivity to log f for each of such tests was low frequency, 200 kHz (log f below ? 6.3) the average resistivity value obtained did not change much. Furthermore, for frequencies up to 10 MHz (log f = 7), the resistivity value increased and decreased again until the frequency was 13 MHz (log f ? 7.13). The peak of resistivity is obtained at a frequency of 10 MHz, the peak order from the lowest is the variation in the content of NaCl, HCl, NaOH, then water content. Meanwhile, in the impulse test, the average resistivity of bentonite was the lowest when HCl was applied. Meanwhile, water content does not significantly affect the decrease in resistivity of bentonite when compared to other variations. NaOH gives the second lowest resistivity after HCl and NaCl gives lower resistivity than water content variation. The more conductive the bentonite is, the smaller the resulting breakdown voltage. This can be seen from the comparison of the breakdown stress for each variation in bentonite, namely HCl providing the smallest breakdown stress and water content providing the highest breakdown stress.