Herman Parung

Corrosion of Concrete Using Portland Composite Cement and Rice Husk Ash under Simulated Acid Rain Environment

Cement production, which results in higher CO2 levels, has a negative impact on environment. This phenomenon has caused the emergence of a new type of environmentally friendly cement, such as Portland Composite Cement (PCC). On the other hand, rainfall becomes high acidity level. This will be an issue in the construction of concrete, which causes concrete deterioration if value of pH is below 6. The purpose of this study is to investigate corrosion caused by acid rainfall when used PCC cement mixed with RHA. RHA replacement level of 5%, by weight of cement was used in this study. The compressive strength design was 30 MPa. The simulated acid rain solution was prepared by mixing solution of H2SO4 and HNO3 to reach value pH of 4. The deterioration was measured by the number of corrosion product using SEM test. The results indicate a decrease in the number of component corrosion that occurs by using ASP.

Ultimate Experiment of Ruptured Concrete Beams Strengthened Using GFRP-Sheet after Fatigue Loads

An experimental study has been carried out to investigate the structural behavior of beam which was strengthened by glass fiber reinforced polymer (GFRP-S). The Experimental was carried out to determine the effect of fatigue loads on flexural capacity of reinforced concrete beams. Each specimen was 6 m long with 300x500 mm rectangular cross section. Each specimen was treated with different loads. In this study using two different loads applied to the beam was static loads and fatigue loads. Static load was applied to the beam (B1) without GFRP reinforcement, a beam control. (A2) applied static load beam with GFRP reinforcement. Fatigue load applied to the beam reinforced with GFRP (B2) as well. For (A1) beam load was applied to the ultimate strength after reached 51.84 kN load, and then the concrete beams was strengthened with GFRP and fatigue loading until crushed. The result of this research showed that deflection under fatigue loads was higher than deflection of static loads. GFRP reinforcement showed an increase in the capacity of the test beam. The Increase of the power of static loading with GFRP reinforcement of 4.4%. The increase in the fatigue strength of 75 kN was 4.7%, the imposition 167.5 kN was 4.2%, and the imposition 260 kN was 2.9%.