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卢惟铭

 

 （厦门市湖里区建设服务中心，厦门 361000）

摘要：为探究粉煤灰、硅灰、聚丙烯纤维（PPF）对再生粗骨料（RA）混凝土力学及耐久性能影响，采用20%粉煤灰、5%硅灰等质量替代水泥制备了不同PPF、RA掺量的混凝土试件，进行抗压强度、劈裂抗拉强度、吸水率、抗硫酸盐侵蚀、无损强度试验。结果表明:抗压、劈裂抗拉强度随RA掺量增加而减小，随PPF掺量增加而增大，掺入粉煤灰、硅灰、PPF可降低因掺入RA引起的强度损失；吸水率、硫酸盐侵蚀抗压强度损失率、无损检测抗压强度随RA掺量增加而增大，随PPF掺量增加而减小；掺入PPF体积分数1.5%、RA掺量50%的再生粗骨料混凝土性能优于天然骨料混凝土。研究成果可为再生粗骨料混凝土的工程实际应用提供理论依据。

关键词：再生粗骨料；聚丙烯纤维；多元矿物；力学性能；耐久性能；无损强度检测

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

 

 

LU Weiming

 

 

(Xiamen City Huli District Construction Service Centre,Xiamen 361000,China）

 

Abstract：To investigate the effects of fly ash,silica fume,and polypropylene fiber (PPF) on the mechanical and durability properties of concrete incorporating recycled coarse aggregate (RA),concrete specimens with varying PPF and RA contents were prepared.These specimens utilized 20% fly ash and 5% silica fume to replace cement at an equal mass ratio.Tests conducted included compressive strength,splitting tensile strength,water absorption,sulfate attack resistance,and non-destructive strength evaluation.The results showed that compressive and splitting tensile strength decreased with the increase of RA dosage and increased with the increase of PPF dosage,and the doping of fly ash,silica fume,and PPF could reduce the strength loss caused by the doping of RA;Water absorption,loss rate of compressive strength against sulfate erosion,and the difference of non-destructive strength testing increased with the increase of RA dosage,and decreased with the increase of PPF dosage,and the difference between the volume fraction of PPF of 1.5%,RA The performance of recycled coarse aggregate concrete with 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

作者简介：卢惟铭（1970—），男，本科，高级工程师，研究方向:工程建设管理。

收稿日期：2025-06-30