聚丙烯纤维增强再生粗骨料混凝土性能研究

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中图分类号：TU528 文献标志码：A 文章编号：1005-8249（2025）06-0012-06

DOI：10.19860/j.cnki.issn1005-8249.2025.06.003

Abstract：Toinvestigatetheefectsofflyash，silicafume，andpolypropylenefiber（PPF）onthemechanicalanddurability properties ofconcrete incorporating recycledcoarse agregate（RA），concrete specimens withvarying PPFandRAcontents were prepared. These specimens utilized 20% fly ash and 5% silica fume to replace cement at an equal mass ratio. Tests conducted includedcompressivestrength，spliting tensilestrength，waterabsorption，sulfateattackresistance，andnon-destructive strength evaluation.Theresultsshowedthatcompresiveand spliting tensile strengthdecreased withtheincreaseof RAdosage andincreased with theincreaseofPPFdosage，andthedopingofflyash，silicafume，andPPFcouldreduce thestrength loss causedbythedopingofRA；Waterabsorption，lossrateofcompresive strengthagainstsulfateerosion，andthedifferenceof non-destructive strength testing increased withthe increaseof RA dosage，and decreased with the increase of PPFdosage，and the difference between the volume fraction of PPF of 1.5% ，RA The performance of recycled coarse aggregate concrete with （20 1.5% PPF volume fraction and 50% RA dosage is better than that of natural aggregate concrete. The research results can provide theoretical basis for the practical application of recycled coarse aggregate concrete.

Key words：recycled coarse aggregate；polypropylene fiber；multi-mineral；mechanical properties；durability；nondestructive strength testing

0 引言

随着城市更新改造工程的推进，将产生大量废弃建筑垃圾，采用再生混凝土技术1可以将其二次利用，不仅有效地解决了建筑垃圾积累、存放污染环境问题，而且能够减少天然骨料用量，节约自然资源，促进建筑行业可持续性发展。（剩余8322字）