Today, the increase of waste from industry is related to economic growth, which is causing “global warming”. Therefore, reducing waste from industry could result in the reduction of global warming. To manage waste treatments, landfill is one of the most popular methods, despite high costs and the usage of resources are not efficient. Concrete waste is another type of waste in industry; the consumption of ready mixed concrete industry has also risen due to an increase in domestic construction. This is why different methods of waste treatment should have good management with usage of resources to reach maximum efficiency. The most recommendable method is 3R; R1.Reduce, is to reduce consuming of unnecessary resources, R2. Reuse, is to efficiently use resources and R3.Recycle, is to convert waste into reusable material. According to the quality testing on attribute of gradation and dust volume of rock and sand derived from unused ready mixed concrete, the test result met the standard range and suitable for using as material for concrete production. The design of experimental was conducted to find the optimum proportion of new rock, sand and recycled material. The proportion of percentage of 0, 20, 40 and 100 has been varied. As the result of this experiment, the optimum percentage of recycled rock and sand should 20-40 percent.
Keywords: Ready mixed concrete, Concrete waste, Concrete recycling machine, Slump loss, Compressive strength