粉煤灰再生骨料混凝土力學性能及微結構演變

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

打開文本圖片集

陳義國1，齊仕杰2，紀續(xù)，岳紅亞2，王磊?，徐潤2

（1．濟南金日公路工程有限公司，濟南250101；2．山東省交通規(guī)劃設計院集團有限公司，濟南250101）

中圖分類號：TU528.45 文獻標志碼：A 文章編號：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

材料科學

0 引言

當前，大規(guī)模城鎮(zhèn)化進程所產生的廢棄混凝土通常以堆放或填埋方式處理，造成了土地資源浪費及環(huán)境污染，而如何處置大量的廢舊混凝土成為亟待解決的問題。（剩余8223字）