UNS – Students of Universitas Sebelas Maret (UNS) Surakarta create high quality concrete technology innovations using marble waste and cow bones. They are Adhirajasa, Yesika Azzukhruf, Panji Pramayswara Pamilih, and Farhan Nurfi Afriansyah from Civil Engineering Department Faculty of Engineering (FT).
The four students who are the members of Semar Solid group created a type of Self Compacting Concrete (SCC). SCC is a high quality concrete that can compact itself.
“We made SCC which is environmentally friendly and bagged. The SCC method makes concrete that can compact itself without requiring vibration or other efforts to compact concrete,” Panji explained on Thursday (4/10/2018).
In this method, Panji continued, marble waste and cow bones are processed in such a way as a mixture of materials in creating concrete.
“A lot of waste is wasted from these two materials, so we use it. Both can make concrete harden faster and can also increase the compressive strength of the concrete,” Panji stated.
Yesika added that bones are used in concrete structures because they contain large amounts of Calcium Oxide (CaO). CaO itself is the largest composition in cement.
Likewise, marble which has the main chemical elements namely Silicon Dioxide / Silicate (SiO2), Calcium Oxide (CaO) and magnesium Oxide (MgO). The chemical content is partly contained in cement. Besides chemical elements, marble is also known to have a high compressive strength.
“When tested, our concrete compressive strength reached 20 (Mega Pascal) at 24 hours. About 41.6 percent of the compressive strength is 28 days,” he added.
According to Yesika, their concrete innovation can be applied to road construction. It is because their concrete hardening process does not take a long time.
“For ordinary concrete is processed around 3 days, it can be 40 percent compressive strength. We only have one day,” Yesika explained.
In addition, the use of these two materials is considered more economical because it can save costs of around 7.78 percent from making concrete using ordinary materials.
The work of the Semar Solid team has gone through a series of trials and was contested in an international concrete innovation competition 2018 held by the Sepuluh November Institute of Technology (ITS). They won the second prize in the event in the award presentation held on Saturday (9/29/2018). humas-red.uns/Tni/Dty