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赵静怡

（ 安康学院陕南生态经济发展研究中心 ，陕西 安康 725000)

摘   要 ：为有效提升建筑废料再生绿色混凝土 ( RAC)   的力学性能 ，室内利用钢纤维和聚丙烯纤维分别制备了钢纤维改良 RAC 、聚丙烯纤维改良 RAC 以及钢－聚丙烯纤维改良 RAC ,  并对三种RAC 材料开展了坍落度试验和力学试验。研究发现： (1)  素 RAC 拌合物坍落度较高 ，可以达到 168. 87 mm;  单掺或混掺钢纤维和聚丙烯 纤维材料后RAC 拌合物的坍落度显著降低 ，单掺 1% 钢纤维材料的混凝土拌合物坍落度为 92. 16  mm ,  单掺 0. 8%PF 材料的 RAC 拌合物坍落度为 108. 95 mm 。 (2)  单掺钢纤维后混凝土的承载能力明显增强，而聚丙烯纤 维则会劣化RAC 试件的承载能力 ，单掺聚丙烯纤维后RAC 强度出现轻微降低 。当钢纤维和 PF 材料的掺量较大时，RAC 试件的立方体抗压强度又出现了明显的降低 。(3)  当聚丙烯或钢纤维掺量较低时 ，RAC 试件的抗拉强 度随另一种纤维材料掺量的增大逐渐增大；而当 PF 或钢纤维掺量较大时，RAC 试件的抗拉强度则会出现减小 的现象 。研究成果为我国建筑废料的回收利用以及混凝土的改良提供了一定的借鉴作用。

      关键词 ：混凝土改良 ；钢纤维 ；聚丙烯纤维 ；再生粗骨料 ；建筑垃圾回收 ；力学试验

      中图分类号 ：TU528. 1           

      文献标志码 ：A            

      文章编号 ：1005- 8249  (2023)   06- 0088- 05

DOI : 10. 19860/j . cnki . issn1005- 8249. 2023 . 06. 014

ZHAO Jingyi

( Ankang University Shaannan Eco-economy Research Center ,  Ankang 725000 ,   China)

Abstract: To effectively improve the mechanical properties of recycled green concrete (RAC) from construction waste, steel fiber modified RAC, polypropylene fiber modified RAC and steel polypropylene fiber modified RAC were prepared by using steel fiber and polypropylene fiber respectively, and slump test and mechanical test were carried out on three RAC materials. It is found that: (1) the slump of plain RAC mixture is high, which can reach 168.87 mm; The slump of RAC mixture is significantly reduced after single or mixed with steel fiber and polypropylene fiber materials. The slump of concrete mixture with 1% steel fiber materials is 92.16 mm and that of Rac mixture with 0.8% pf materials is 108.95 mm. (2) After adding steel fiber alone, the bearing capacity of concrete is significantly enhanced, while polypropylene fiber will degrade the bearing capacity of RAC specimens, and the strength of RAC decreases slightly after adding polypropylene fiber alone. When the content of steel fiber and PF material is large, the cube compressive strength of RAC specimen decreases obviously. (3) When the content of polypropylene or steel fiber is low, the tensile strength of RAC specimen increases gradually with the increase of the content of another fiber material; When the content of PF or steel fiber is large, the tensile strength of Rac specimen will decrease. The research results provide a certain reference for the recycling of construction waste and the improvement of concrete in China.

Keywords: concrete improvement, steel fiber, polypropylene fiber, recycled coarse aggregate, construction waste recycling, mechanical test

作者简介 ：赵静怡  (1987—) ,  女 ，硕士 ，讲师 。主要研究方向 ：工程管理。

收稿日期 ：2023- 05- 1 1