Research Utilization Rice Husk Ash as Substitute for Fireproof Concrete
Desire to get fireproof concrete but still strong, durable, and economical is still an expectation for developers and building owners, because then will be obtained a building that meets technical requirements at low cost. Based on Law no. 28 of 2002 concerning Building, it mandates that each building must meet the requirements of safety, health, comfort, and convenience. Safety aspects include aspects of load, fire, lightning, electrical installations, and explosives. This is why until now the problem of refractory concrete is still an interesting topic, for various reasons such as the demands of laws and regulations, technical requirements, risk reduction, and so on. Theoretically, main parameter that can determine fire resistance is conductivity and integrity materials, but for certain cases that also need attention is the use of raw materials that have insulating properties against fire, because it will determine nature concrete that produced. At present national rice production reaches 57.16 million tons / year, and will produce about 20 % of rice husk or 11.43 million tons / year. This amount will increase along with government's plan through Ministry Agriculture which will open 1,000,000 ha rice fields. Utilization husk currently limited to mixing materials in manufacture bricks and fuel in burning bricks with field stoves. From burning the husk it can produce husk ash by 20 % from weight husk with large enough silica content and includes cementitious materials and insulators. With potential and characteristics as above, it is necessary to continue to improve its use, among others, as substitute for manufacture refractory concrete. Research utilization rice husk ash for refractory concrete is an effort to create buildings that meet safety and comfort requirements because it will inhibit thermal propagation so the room becomes cool and prevent heat radiation that can cause fires. From research results, it was obtained data that rice husk ash can be used as substitute for making concrete and increasing value of thermal conductivity of concrete produced. Based on its compressive strength optimal rice husk ash content obtained at 20 % aggregate, with thermal conductivity value is very good (below maximum limit specified). Thus it can be concluded that rice husk ash can be used as substitute in manufacture refractory concrete, to improve safety and comfort buildings.
Keywords - Rice Husk Ash, Refractory Concrete, Conductivity, Building Safety.