Mechanical properties of powder concrete with a geopolymer bond

Commonly, the manufacturing of Reactive Powder Concrete (RPC) uses a portlant cement as a binder. This research introduce a powder based concrete with an eco- friendly geopolymer binder. The production of geopolymer-powder concrete is believed as an alternative to reduce large amounts of CO 2 released into the air. A geopolymer is obtained by mixing a fly ash as residual of coal burning waste with lye which is the mixture of sodium hidroxide and sodium silicate. Apart from that, glass powder is used to replace quartz powder (with similar quantity) in the manufacturing of this concrete. In producing of geopolymer-powder concrete, 4 mixed variations have been used based on the volume ratio between geopolymer and glass powder. To investigate the mechanical characteristic of geopolymer-powder concrete, several tests include compressive-, flexural-, and split-tensile strength test were conducted using a 20 cm x 10 cm cylindrical speciment and a cube of 40 cm x 10 cm x 10 cm. The test results prove that using 20% of geopolymer mixture, the specimen can achieve the compressive strength of 15, 97 MPa, flexural strength of 5, 49 MPa, and split-tensile strength of 2, 90 MPa.