基体混凝土对再生混凝土性能的影响

The Influence of Matrix Concrete on the Recycled Concrete

试验中所用的再生粗集料是通过粉碎混凝土试块所获得的。再生混凝土是采用四种不同强度等级的基体混凝土的再生集料(占所用粗集料总量的50%)来配置的。再生混凝土的破坏是集料与砂浆粘结界面的粘结破坏,这与天然混凝土的破坏过程和破坏机理基本一致。再生混凝土的强度受基体混凝土的影响,基体混凝土强度等级在低于C35时再生混凝土强度基本低于天然混凝土,但当基体混凝土强度等级在高于C35时,再生混凝土的强度会高于天然混凝土。

Recycled tearse aggregates obtained by crushed concrete were used for concrete production. Four different recycled aggrcga, t~ conaretes were produced; made with 50% of recycled coarse aggregates of four intensity levels. The damage of the recyoled concrete was the bond failure of the interface between aggregate and mortar, which was basically the same as the damage process and damage mechanism of the natural concrete. The strength of recycled concrete was influenced by matrix concrete, When the strength grade of matrix concrete was less than C35, the recycled strength of concrete will be inferior to that of natural concrete basically. But when the strength grade of matrix concrete is higher than C35, the recycled concrete strength will be higher than that of natural concrete.