Study on preparation and properties of all-solid waste fired bricks
Construction waste and Yellow River sedimentary sand and sludge were used to make the all-solid waste fired brick.The physical and chemical properties of raw materials were evaluated by using XRD,XRF,SEM and other methods.The best preparation method and sintering system have been determined.The influence of water content and addition of Yellow River sedimentary sand on the mechanical properties of fired bricks was investigated.The results show that when the water content is 25%,the moisture volatilization is stable,and the strength of fired brick is enhanced.When the replacement rate of Yellow River sedi-mentary sand is 30%,a complete skeleton structure is formed and the strength of fired brick is increased.2 h insulation treatment in every 2 gradient can provide the necessary environ-ment for material reaction and gas volatilization,and can improve the strength of fired bricks.Inside the fired brick,glass phase and main crystal phase formed after high tempera-ture cooling constitutes the brick skeleton,therefore the brick has good structural stability and mechanical strength.When the water content is 25%and the replacement rate of Yellow River sedimentary sand is 30%,the brick compressive strength is up to 29.3 MPa and the water absorption rate is 9.9%,which meets the requirements of engineering.In this paper,the preparation technology of fired bricks is studied from the aspects of raw material han-dling,proportioning design,raw brick forming and sintering process,and provides a theo-retical basis for the production and preparation of all-solid waste sintered bricks.
solid wastefired bricksintering systemconstruction wasteYellow River sedimentary sandsludge
NETL
NSTL
万方数据
维普
