粉煤灰再生骨料混凝土力学性能及微结构演变

Mechanical Properties and Microstructure Evolution of Recycled Aggregate Concrete with Fly Ash

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陈义国1，齐仕杰2，纪续，岳红亚2，王磊?，徐润2

（1．济南金日公路工程有限公司，济南250101；2．山东省交通规划设计院集团有限公司，济南250101）

中图分类号：TU528.45 文献标志码：A 文章编号：1005-8249（2025）01-0013-06

DOI：10.19860/j.cnki.issn1005-8249.2025.01.003

CHEN Yiguo1，QI Shijie2，JI ，YUE Hongya2，WANG Lei1，XU Run2 (1. Ji'nan Kinyue Highway Engineering Co.，Ltd.，Ji'nan 2501O1，China； Shandong Provincial Communications Planning and Design Institute Group Co.，Ltd.，Ji'nan 25Ol01，China) Abstract：Using waste concreteasrecycledaggregatecan efectivelyavoid the wasteof landresourcesandenvironmental problems.TheappicationofRAnotonly meets the needsof greenand sustainabledevelopmentstrategiesforbuilding materials but alsoefectivelymitigatesthedepletionof naturalstoneresources.However，the highwaterabsorptionrateandcomplex interfacetransitionzoneofRAinevitablyhaveadverseefectsonthemechanicalpropertiesofconcrete.Inthisstudy，the influence mechanismof thesubstitutionofrecycledaggregatesandthepre-soaking treatmentonthe mechanical propertiesoffly ashrecycledaggregateconcrete were explored.Theresults indicatethatthe pre-soaking treatment ensures theefective water to-binderratiointhe matrixandfurtherpromotesthehydrationprocess ofthecementitious materialsthrough interalcuring， thereby fectivelyimprovingtemechanicalpropertiesofflyasheccledaggregateconcrete.Attesametime，theevolutionof mechanical propertiesofflyashrecycledaggregateconcretewasverifiedthrough atime-varyingcompresivestrengthmodel， effectively promoting the utilization of RA in the direction of building materials.

Key words： recycled aggregate； concrete； physical properties； micro - morphology； pore structure

材料科学

0 引言

当前，大规模城镇化进程所产生的废弃混凝土通常以堆放或填埋方式处理，造成了土地资源浪费及环境污染，而如何处置大量的废旧混凝土成为亟待解决的问题。（剩余8223字）