Kajian Kerusakkan pada Konstruksi Bangunan Basement Cooling Water Pump (CWP) PLTU Pembangkit Pembangkitan Sumatera Utara Bagian Utara Sektor Pembangkitan Belawan

Abstract

Corrosion is a natural process which occurs in metal materials that causes their strength to decrease. This natural process is very difficult to be avoided; the only effort is by curbing the corrosion rate by guarding against it. Damage is often found in building constructions which are caused by corrosion on the sides of the rea, one of them is in the PLTU construction which functions as cooling water pump Today, the basement construction of PLTU is damaged because of the factor of sea water and the humidity in which its structure is corroded.

The research was conducted through some processes when corrosion occurred in the basement of the PLTU. Therefore, the checking of the structure by using Hammer Test and core sampling cutting device was done in order to find out the quality of the concrete in the basement construction. The result was brought to the laboratory to be tested in its pressure strength, carbonization test on the concrete. and the test on the penetration of ion chloride. These tests were done in order to find out how big the damage in the basement construction of PLTU

The result of the research showed that the thickness of the concrete cover of 30 mm would have the corrosive acceleration of 0.39 mm with the ratio of cement water was from 0.4 to 0.52 mm, while the thickness of the concrete cover was 60 mm with the corrosive acceleration of 0.196 mm with the ration of cement water was from 0.4 to 0.264 mm. The CWP PLTU basement construction was influenced by the existence of carbonization factor which caused damage in the reinforcement with the depth of around 10 mm. In the CWP PLTU construction, the influence of corrosion on the construction began to be unsafe when it was 25 and 30 years old