建筑垃圾模压制品力学性能的研究

Research on mechanical properties of molded products using building waste

建筑垃圾资源化利用是发展绿色建材、可持续发展的必然要求。以成型压力、建筑垃圾掺入量、粉煤灰取代水泥量为主要影响因素,对建筑垃圾模压制品(MPBW)的力学性能进行深入研究。试验表明:以废弃混凝土加工处理成细集料,加入水泥为胶凝材料模压制成的建材制品具有良好的力学性能;在15 MPa以下时制品强度随成型压力增加而提高,成型压力从15 MPa增加到20 MPa时,制品强度就几乎没提高;建筑垃圾掺入量从50%增加到100%时,对模压制品强度影响很小;粉煤灰取代水泥后制品强度变化明显,当粉煤灰取代2/3水泥时,制品28 d抗压强度为15.4 MPa,仍高于砌块墙材的强度要求,而且制品后期强度增长显著,180 d抗压强度达到25.2 MPa。结果证明,通过控制成型压力、改变建筑垃圾掺入量或粉煤灰取代水泥量,利用建筑垃圾可以生产出具有良好力学性能的板材、块材、构件等建材制品。

Recycle utilization of building waste is the tendency of building material for environment protection and sustainable development.Mechanical properties of molded products using building waste （MPBW）were investigated.The main parameters are focus on molded pressure,dosage of building waste added into cement and fly ash.The results of experiments showed that molded products using concretes debris as fine ag-gregates hvae stronger mechanical properties.The strength of product increased along with molding pressure increase under 15 MPa,but it was al-most no increase when the molding pressure was up from 15 MPa to 20 MPa.The addition of building waste has little effect on the compressive strength of product when its dosage range from 50% to 100%.The strength of product had obviously changed after using fly ash partially substitute for cement,when fly ash replace two thirds cement,the product strength of 28 d was 15.4 MPa,and was still higher than that of the normal wall materials.Later strength of the product had markedly increased,its 180 d compressive strength achieved 25.2 MPa.Test results confirmed：using building waste,panel,block and other products with better mechanical properties could be manufactured by adjusting the molded pressure and the dosage of building waste and fly ash.