Experimental Research On The Proportioning Of Coal Gangue Concrete And Mortar Made Wallboard Used In Fabricated Steel Structure Buildings

As an energy-rich country,China is a world's leading country of the exploitation as well as the consumption of coal.Along with the massive exploitation of coal,the amount of its associated mineral,which is coal gangue,is climbing.However,the storage of such huge quantity of coal gangue is harmful to the environment,meanwhile,it is also a waste of energy if the coal gangue cannot be effectively used.On the other hand,with the further development and deeper promotion of steel structure buildings in China,the demand for the research of new type of supporting wallboard material is increasing.The experiments in this essay,as a part of the National Youth Science Fund Project “Theoretical and experimental study on new coal gangue wallboard matched with the steel structure housing”(51208332),taking coal gangue and self-ignition coal gangue stored in a city of Shanxi as research object,the experiment methods and outcomes are listed as follows:(1)Measuring the physical and mechanical properties such as density,grain composition,water absorption and cylinder compressive strength,chemical component,and radioactivity of coal gangue and self-ignition coal gangue by mechanical experiment,SEM scan or Energy Disperse Spectroscopy(EDS).(2)Proposing three different concrete proportioning for the concrete with coal gangue as coarse aggregate,and then acquiring the mechanical properties,which are compressive strength,splitting tensile strength and elasticity modulus,of C20,C25 and C30 coal gangue concrete with four different age of concrete each by mechanical property tests on 123 specimens.Lastly,suggesting the recommended coal gangue concrete proportioning.(3)Designing five different concrete proportioning for the concrete with self-ignition coal gangue as coarse aggregate.By testing 205 specimens,the compressive strength,splitting tensile strength and elasticity modulus of the concrete specimens are collected and analyzed to reveal the influence to the strength of concrete,apparent density and workability caused by fly ash,water reducer or expanded perlite.Finally,suggesting the recommended self-ignition coal gangue concrete proportioning.(4)Obtaining continuous graded manufactured sand with grain diameter less than 3mm after crushing self-ignition coal gangue,secondly,the manufactured sand is mixed with hydrogen peroxide solution to get foamed mortar,thirdly,336 cubic specimens are made with 13 different proportioning.The changing of apparent density and strength of those foamed mortar specimens are noted when different amounts of admixture including hydrogen peroxide solution,water reducer,cellulose and expanded perlite are adopted.Lastly,the recommended proportioning for self-ignition coal gangue manufactured sand formed mortarwith strength grade M10 is suggested.(5)Producing wallboard specimen with self-ignition coal gangue manufactured sand formed mortar,by specific tests,the heat transfer coefficient of formed mortar is 2.705W/(m~2·K);and sound reduction index of100 mm formed mortarwallboard specimen is 37 dB,and the index is 41 dB after 10 mm plaster covered on the specimen.Coal gangue and self-ignition coal gangue concrete analyzed in this essay can be used as the material for not only wallboard in steel structure buildings,but also common concrete members.Besides,the foamed mortar tested in this work can be used as a new material to produce interior wallboard in steel structure buildings,more importantly,the utilization of this new material is helpful to the development and promotion of steel structure and fabricated buildings,meanwhile,the utilization of coal gangue reduces its negative influence on the environment,and benefits to the society,environment and economy.