From Waste Coal, Being Environmentally Friendly Concrete
Good news came from the world of science has found a way to utilize coal waste into useful products and even environmentally friendly. Innovation Centre Indonesian Institute of Sciences (LIPI) in cooperation with the Japan International Cooperation Agency (JICA) and Hakko Industry Co., Ltd. utilizing coal waste as raw material for concrete. Concrete that has the strength and timing of maturation faster and environmentally friendly than conventional concrete.
As known, coal became the main source of national electrical energy source procurement is cheap and efficient, but its shortcomings are becoming one of the sources of pollution and waste that is harmful to the environment.
But now, the waste can be used without damaging the environment. In fact, on the contrary, its products will be environmentally friendly. This concrete can be used to build national roads and a wide range of infrastructure, both buildings, parks and other infrastructure uses concrete base material. This concrete is environmentally friendly and can absorb water. Thus, no longer exist puddles of water which affects the smoothness of traffic, accidents, and even damage to the road.
According to Head of the Innovation Center LIPI Nurul Taufiq Rochman, quoted by koran-jakarta.com (23/7), buildings constructed with environmentally friendly concrete, if an earthquake happens, there will be casualties as concrete in general, when a fall or overwrite the existing human underneath.
Not only that, concrete is an excellent fit with the Indonesian region often subscribed to natural disasters, whether earthquakes or tsunamis. Indonesia including in the neighborhood of ring of fire, that have potential for natural disasters is quite high. Indonesia has about 240 volcanoes, 70 of which are still active.
Concrete is already being applied to build some infrastructure in Japan, which is prone to earthquakes. "In Japan, the concrete is commonly used to build the infrastructure of concrete breakwater, because his strength is assured and build gardens because the concrete is not hot when stepped on with bare feet," said Nurul.
Another advantage is seen from the concrete level of tidiness and shape. In other words, each paving block of concrete is highly considered. If utilized in the construction of the park, each paving block of concrete can be colored in accordance with the wishes.
LIPI Deputy of Scientific Services, Bambang Subiyanto, said, to make concrete that is environmentally friendly, the raw materials are all in Indonesia. By utilizing the waste from the production of Steam Power (power plant) in all regions of Indonesia. "That is, it becomes a kind of concrete solutions in the handling of coal waste are available and can be utilized in the construction of infrastructure," he said.
Furthermore, Bambang said that in the near future LIPI will explore opportunities for cooperation with some power plants, such as power plant in Pacitan, Pangandaran, Sukabumi, and productions that exist in other areas that use coal as a raw material. Currently, the power plant in Pacitan LIPI has been invited to make environmentally friendly concrete plant in his power plant factory environment.
"In a day of bottom ash waste (bottom ash) they spend as much as 250 tonnes of waste. Waste fly ash (fly ash) 200-1000 tonnes per day. Imagine the waste from the combustion of coal that would otherwise be discarded where we take advantage, "he said.
Director of Research and Development Hakko Co. Ltd. Yoshihide Wada explained, the project conducted by JICA and LIPI have walked in producing environmentally friendly concrete of raw materials from Indonesia by using technology Hakko Industry Co. Ltd..
"We hope this activity can help disseminate environmentally friendly products to the people of Indonesia through the introduction to the characteristics of the products manufactured in Indonesia," he said.
Problem of raw materials and the manufacturing process, Karunia Mita Sekar Cahyani, Project Manager of Nano Tech Innovation Indonesia (tenant LIPI) said that from the name alone is clearly known that the environmentally friendly concrete is made of the results of the utilization of coal waste from the production of steam power plants, ie bottom ash, then cement, fresh water, addictive substances (YHR) and dye if necessary. "Usually, if we messaging bottom ash, fly ash is also contained. So, for the water content, tailored to their needs, "he said.
For the manufacturing process, of the total mix, it takes 40-60 percent of bottom ash, while 2-5 percent addictive substances, and the composition of the water is adjusted to production needs. Typically, to determine the composition of the water, more or less, then the ingredient blend has our handheld disposable hand. "For 36 kg of bottom ash is required 1.5 to 10 liters of water. The bottom line depends on the condition, there are no standards, "he said.
For the manufacturing process, all material was mixed with a concrete mixer truck. Having ascertained all mixed evenly, then put into the mold according to the size and shape. "Shortly after that, then the concrete can be used in infrastructure development in Indonesia," he said.