Pengaruh Abu Kulit Nipah Terhadap Kuat Tekan Beton Mutu F'c 30 MPa Dengan Tambahan Zat Grolen HP 19R

Concrete is a construction material that plays a crucial role in infrastructure development due to its strength and durability. One approach to improving concrete performance is by utilizing organic waste-based additives such as nipah shell ash, which has pozzolanic properties, and the chemical admixture Grolen HP 19R, which functions as a superplasticizer. This study aims to analyze the effect of combining nipah shell ash and Grolen HP 19R on the slump value and compressive strength of concrete with a target strength of f’c 30 MPa, determine the optimal mix proportion, and evaluate the potential use of organic waste in sustainable construction. The variations of nipah shell ash used were 0.1%, 0.3%, 0.5%, and 0.7% by weight of cement, while Grolen HP 19R was consistently used at 0.2%. Testing was conducted at the concrete age of 28 days. The results showed that adding 0.5% nipah shell ash and 0.2% Grolen HP 19R maintained workability within the standard range (slump 12 ± 2 cm) without additional water and achieved an average compressive strength of 30.01 MPa, representing a 1.23% increase compared to normal concrete. In contrast, the use of nipah shell ash without Grolen HP 19R reduced compressive strength by up to 32.33%. Therefore, the combination of nipah shell ash and Grolen HP 19R is
recommended as an eco-friendly innovation capable of improving concrete quality while reducing organic waste.