Research of Biomass ash to concrete.
KMUTT researchers add value to "biomass ash for concrete production" Reduce the use of cement with industrial waste.
At present, biomass ash from incineration to use heat to generate electricity in Thai industrial plants totals approximately 3 million tons per year, becoming waste that is dumped, causing pollution. Therefore, it is necessary to urgently find a way to eliminate to avoid ash problems from various factories Both rice husk ash from the rice mill industry Bagasse ash from the sugar industry and oil palm ash from the palm oil industry become a problem that creates environmental impacts on the country in the future.
Prof. Dr. Chai Chaturaphithakkul Lecturer at the Department of Civil Engineering Faculty of Engineering King Mongkut's University of Technology Thonburi (KMUTT), the project leader to increase the durability of steel reinforced concrete under high corrosion conditions by using ash from industrial plants said the past The majority of such factory waste disposal methods are disposal. causing problems in terms of the dump site, the environment, and the high costif not expedited to find a solution, it may have long-term consequences. The research team therefore conducted a study on the preliminary properties of each type of biomass ash. It was found that these 3 types of ash have potential to be used as an ingredient in concrete instead of cement, and the properties of each type of ash have been developed to be able to be used in practice supported by research both at home and abroad.
“These ashes When taken to find the chemical composition and found that A mixture of silica (silica) and alumina (alumina) is quite high. These elements when reacted with alkalis present in cement to form a binder. We call this reaction The "pozzolanic reaction" and called this type of material. "pozzolanic material" which is a specific term
Biomass ash was then tried to be used as an ingredient in concrete by replacing cement in the proportion of 15-25 percent, which normally requires cement as the main ingredient of 300 kg/m3 in the concrete production process. reduced to only 230 kg. The remaining 70 kg was biomass ash. After leaving the experiment for about 30 - 60 days, the results showed that the concrete containing biomass ash could bear the strength close to or equal to that of normal concrete.
These ash have the potential to be used as an ingredient in concrete as a replacement for some cement in the future. This will reduce the use of cement. Reduce the explosion of mountains to be used to produce cement. Reduce the cost of concrete production Reduce pollution and environmental pollution problems causing space restrictions and if we can use it instead of cement In the production of concrete, which is a large industry that produces more than 30 million tons of cement a year, it will help reduce the waste problem that will become a problem for society in the future. Therefore, this research will help answer the question for the industrial sector. It also brings benefits to the nation as a whole,” said Prof. Dr. Chai.
It also solves the problem of industrial waste by recycling it, because nowadays most industrial plants are trying to find a way to dispose of the waste that each year there will be more than 3 million tons of these waste materials together from the original that had to be discarded causing space restrictions and if we can use it instead of cement In the production of concrete, which is a large industry that produces more than 30 million tons of cement a year, it will help reduce the waste problem that will become a problem for society in the future. Therefore, this research will help answer the question for the industrial sector. It also brings benefits to the nation as a whole,” said Prof. Dr. Chai.
The head of the research project also said that the concrete structure normally has reinforcement inside the concrete. Although steel reinforcement makes the structure stronger, but there is a weakness that the concrete is a porous material. If near the sea Seawater will slowly seep through the concrete and reach the steel. make iron rust cracks in concrete It can be seen from the brown water marks, which is a stain of iron rust that flows out as a result, the concrete structure is damaged. and may eventually collapse Cause serious danger to life and property. The research team has brought the above research to continue. By experimenting with the said biomass ash to grind more thoroughly. and then mixed with cement as a result, with the fineness of ash, it can penetrate and fill the voids within the concrete. This makes it more difficult for air or sea water to penetrate into the concrete. slows down the rusting of steel and prolong the life of reinforced concrete.
In addition, the demolition of concrete from the old structure was also tested. be crushed or shredded into smaller sizes equal to that of general concrete mixes It is called recycled rock or aggregate obtained from crushing concrete scraps. And when it is crushed or shredded more thoroughly until it is the same size as sand, it is called recycled sand.
or fine aggregate from the crushing of concrete crumbs The two parts were then mixed with cement and biomass ash. The results of laboratory experiments showed that Concrete obtained from the use of old concrete scraps into concrete mixes. Still has lower strength than normal concrete. This will require further research to increase the strength to be equal to normal concrete.
Prof. Dr. Chai said that in addition to the introduction of biomass ash can be used in concrete mix It also helps in the rusting of the steel in the structure, making it harder to rust or less rust. But more research is still needed to make the use of these wastes more reliable and must be understood for the general public before using it because it must be accepted that this is a new world in the past, there has been no research on the subject, even the United States, Europe or Japan, because these countries do not have ash from biomass. While Thailand is an agricultural country that produces large quantities of rice, sugar cane and palm oil. especially palm oil KMUTT is the first in Thailand that has been researching oil palm ash continuously and for a long time until able to push for the drafting of the industry standard Oil palm ash is used as a concrete admixture. And prepare to announce it as a standard TIS which will be issued by the Thai Industrial Standards Institute (TISI) in order to properly apply the oil palm ash in concrete work It is also expected that ash from other biomass will be introduced. Let's use more benefits in the future by using the oil palm ash model as a model.
With the results of such research that has continued to conduct research studies and bring benefits to the public. Therefore, the Office of the National Research Council of Thailand (NRCT) has selected Prof. Dr. Chai Chaturapitakkul to Awarded as the National Outstanding Researcher of the Year 2013 in Engineering and Industrial Research
which is considered a branch KMUTT has received such awards for 5 consecutive years from 2009 to 2013, with Prof. Dr. Chai being the 5th person and is also a field with outstanding research results of the university as 1 in the National Research University (NRU) receiving research funding from the Office of the Higher Education Commission (OHEC) to extend research results in materials science and materials engineering, phase 1 (2011-2014).
Source : https://www.bangkokbiznews.com/tech/616129
