Evaluation of fly ash concrete in salt environment

¹ Department of Civil Engineering, Universitas Muhammadiyah Yogyakarta, Brawijaya Street, Geblagan, Tamantirto, Kasihan, 55183 Bantul, Special Region Yogyakarta, Indonesia
² Department of Civil Engineering, Universitas Abdurrab, Pekanbaru, Riau, Indonesia

^* Corresponding author: ahmad.zaki@umy.ac.id

Abstract

Indonesia is an archipelagic country with many buildings located in the coastal area. Seawater contains 3.5% salt, which can eat away at the strength and durability of concrete. Sodium salts can be dangerous when combined with reactive alkaline aggregates, and the crystallization of salts in concrete cavities can destroy them due to crystallization pressure. Concrete porosity is important to study, especially in beachfront buildings and buildings that intersect with the ground. In Riau Province, several companies operate AMP (Asphalt Mixing Plant) or paved mixture production units, which produce a large amount of fly ash or AMP waste. Research suggests that using only alkaline cement, using only alkaline cement, a mixture of 15% and 20% fly ash, can be more durable than concrete. This study used fly ash additives with seawater curing to determine the compressive strength of concrete with a curing life of 7, 14, and 28 days. This research was conducted because there was limited compressive strength research on concrete using a mixture of fly ash with seawater curing.