Abstract
A flat slab is widely used as an alternative form of a house roof. The roof work does not take long. Its simple structure is beautiful to homeowners with a minimalist concept. Because this slab does not use a roof covering, it is very susceptible to the influence of the sea. Damage often occurs. Acid rain causes the concrete to become porous as slab material. This investigation aims to produce a durable roof slab to solve existing problems. The test object used was a reinforced concrete slab of 30cmx60cmx15cm. Three types of compressive strength were used, namely 20 MPa, 30 MPa, and 35 MPa. At the same time, the green concrete concept is used by replacing some of the cement with rice husk ash. The effect of acid rain was carried out by immersing the specimens in an acid solution for 28 days, 90 days, and 120 days. All samples were tested for flexural strength for their mechanical properties and XRD for microstructural properties. The results show that the roof slab with rice husk ash can reduce the damage that occurs due to the influence of acid. At the same time, gypsum and calcium oxide content can show the phenomenon of slab damage.
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