摘   要：研究了经破碎后不同再生集料种类、掺入量、粉煤灰掺量三种因素对再生细石混凝土强度的影响。结果表明，混凝土再生集料所配制的C20再生细石混凝土的早期、后期强度可与天然细石混凝土强度相当，本试验条件下，混凝土再生集料取代率在60%时，试件的7d和28d抗压强度甚至比天然细石混凝土更高；砂浆再生集料和碎砖再生集料配制的再生细石混凝土的早期、后期强度均低于天然细石混凝土强度，且随着砂浆再生集料、碎砖再生集料取代率的增加而明显下降；掺有粉煤灰的再生细石混凝土掺量在20%以内时28d的抗压强度略高于未掺粉煤灰的再生细石混凝土强度。

Abstract: The effects of recycled aggregate types, the replacement ratio of recycled aggregate and fly ash after simple crushing on the compressive strength of recycled fine aggregate concrete are studied. The results show that early and later strengths of the C20 recycled fine concrete with concrete recycled fine aggregate are almost consistent with those of natural fine concrete. When the replacement ratio of concrete recycled fine aggregate is up to 60%, the 7d and 28d compressive strengths of the concrete are higher than those of natural fine concrete, but the early and later strengths of recycled fine aggregate concrete with mortar recycled aggregate or brick recycled aggregate are lower than those of natural fine concrete, and with the increasing of mortar or brick recycled aggregate contents, the strength of recycled fine aggregate concrete decreases significantly; when the replacement ratio of fly ash is within 20%, 28d compressive strength of recycled fine aggregate concrete is slightly higher than that of recycled fine aggregate concrete with fly ash.