【摘要】 以再生粗骨料取代率、红砖微粉掺量作为变量，设置25组试验，对地聚物混凝土的再生粗骨料取代率r₁、红砖微粉-粉煤灰取代率r₂、红砖微粉-矿渣取代率r₃与坍落度、立方体抗压强度f_cu、劈裂抗拉强度f_ts、圆柱体轴心抗压强度f_c、弹性模量E_c、泊松比μ之间的关系进行研究。试验结果表明：随取代率r₁增大，坍落度先降低后升高，混凝土各项力学性能逐渐下降，且当r₁≤50%时，f_cu均大于40 MPa；随取代率r₂增大，坍落度降低，混凝土力学性能逐渐上升，r₂=20%时强度提高10.68%～14.52%；随取代率r₃增大，坍落度降低，r₁≤50%时力学性能先上升后下降，r₃=10%时强度提高5.39～9.99%,r₁较大时r₃对力学性能存在不利影响。更多还原

【Abstract】 Taking the replacement rate of recycled coarse aggregate and the content of red brick powder as variables,25 groups of tests were set up to study the relationship between the replacement rate of recycled coarse aggregate r₁,the replacement rate of red brick powder-fly ash r₂,the replacement rate of red brick powder-slag r₃ and slump,cube compressive strength f_cu,splitting tensile strength f_ts,cylinder axial compressive strength fc,elastic modulus E_c,Poisson′s ratio μ of geopolymer concrete.The results show that with the increase of substitution rate r₁,the slump decreases first and then increases,and the mechanical properties of concrete decrease gradually.When r₁≤50%,f_cu is greater than 40 MPa.With the increase of substitution rate r₂,the slump decreases and the mechanical properties of concrete gradually increase.When r₂=20%,the strength increases from 10.68% to 14.52%.With the increase of substitution rate r₃,the slump decreases.When r₁≤50%,the mechanical properties first increase and then decrease.When r₃=10%,the strength increases from 5.39% to 9.99%.When r₁ is large,r₃ has an adverse effect on mechanical properties.更多还原