Research On The Influence Of Biochar Cement-based Composite Materials

As the most basic material in the construction industry in the world,cement is also an indispensable material in water conservancy projects.In the process of producing cement,a large amount of carbon dioxide gas is produced,causing great harm to the environment.The reform of building materials and building energy conservation are imminent,and the development of new energy-saving and environmentally-friendly materials has become the main task of materials researchers.At present,the development of green and environmentally friendly high-performance and durable concrete is developed and researched through continuous addition of additives and mixed materials.Research on green and environmentally friendly concrete has become a new topic today.As a large agricultural country in the world,my country produces large amounts of rice and wheat every year,and has great potential for development and research.After the rice husk is cracked by high temperature and limited oxygen,a stable carbon-rich material biochar can be produced.Biochar is recognized as the most effective carbon fixation material.Due to its unique structure after high temperature cracking,it not only makes the addition of cement-based materials heat insulation Improved thermal insulation performance and enhanced durability provide unlimited potential for the use of biochar as a building material.The incorporation of biochar can increase the density of the biochar cement test block itself,so that the entire test block structure becomes densified.It can also improve the thermal insulation performance of the test block,save the amount of cement,and reduce environmental pollution and save resources.Economic development has important significance.This article discusses the possibility of adding biochar into cement mortar to improve the mechanical properties and thermal conductivity of the mortar.The mechanical and thermal performance tests of the prepared test blocks were carried out by mixing different kinds of biochar with different mixing ratios and different curing conditions into cementbased materials.main tasks as follows.(1)The biochar prepared from pine wood,wheat,and cement as raw materials was studied.Through the yield,ash content,p H value of the three kinds of biochar,it is concluded that the yield of biochar decreases with the increase of pyrolysis temperature,and the ash content of the three kinds of biochar gradually increases with the increase of pyrolysis temperature.As the pyrolysis temperature increases,the alkalinity of the biochar increases,the volatile matter in the biochar continues to overflow,the carbon skeleton structure is gradually obvious,and the pore structure becomes clearer and more perfect.(2)The effects of three different types of bio-carbon mixed into cement materials on the performance of cement materials after different types of bio-carbon were mixed,and the compressive strength and thermal conductivity of the bio-carbon cement test blocks were tested through compression tests and thermal conductivity tests.Rate and thermal diffusivity.The experiment selects three kinds of biological carbon,three temperatures and two mixing ratios for analysis.The results of compressive strength and thermal conductivity indicate that rice materials are initially selected for the next test.(3)The rice straw bio-carbon cement test block was tested by adding 1%,5%,and 10% to the cement block under three curing conditions: standard curing,drying under dry conditions,and water spraying.The performance changes were tested.And through micro characterization,the mechanism of rice biochar affecting cement-based materials was explored.