Abstract:
Concrete is a widely used material and made by mixing coarse aggregate, fine aggregate, water, and
cement. The production of cement will produce CO2 emissions that cause the greenhouse effect and have
an impact on climate change. Therefore, concrete was developed using eco-friendly materials as a
replacement for cement. Rice husk ash contains around 85-90% of silica content and reacted with
alkaline activators such as sodium silicate (Na2SiO3) and sodium hydroxide (NaOH) can be used as a
binder in concrete to reduce cement content. Self-compacting concrete has high workability and easy to
flow. In this experimental study, will be used 3 variations of rice husk ash content, which are 10%; 20%;
and 30% of rice husk ash as a replacement of cement. The activator that used is Na2SiO3 and NaOH with
a ratio of 5 : 2. The water binder ratio that used is 0,4. The target range of slump flow is 650-800 mm.
In this experimental study, compressive strength, splitting tensile strength, modulus of elasticity, and
unit weight of concrete will be tested. From the test, the compressive strength at the 28th day on 10%,
20%, and 30% of rice husk ash content are 39,025 MPa; 35,415 MPa; and 29,383 MPa. The splitting
tensile strength at the 28th day on 10%, 20%, and 30% of rice husk ash content are 3,243 MPa; 2,632
MPa; and 1,650 MPa. Modulus of elasticity on 30% of rice husk ash content at the 28th day is 10338,327
MPa. Unit weight on 10%, 20%, and 30% of rice husk ask are 2,209 gr/cm3; 2,191 gr/cm3; and 2,177
gr/cm3.
