纤维增强粉煤灰混凝土耐久性研究

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中图分类号：U444 文献标志码：A 文章编号：1005-8249（2025）03-0023-06

DOI：10.19860/j.cnki.issn1005-8249.2025.03.005

Abstract：Inorder to solve the durabilty problemofconcretestructures inthewinterenvironment of Northwest China，the growthtrendofflyashandfiberontheservicelifeofconcretewas explored，andtwodiferentmixratioswereselected tocay outfreze-thawcycletests tostudythedurability.TheWeibull probabilitydistribution functionwasestablished，and the degradationlawwas modeled.Theleast squares method wasused tocalculatetheestimated valueof Weibullparameters.The results show that the mass loss of concrete after circulation is 4.3% for ordinary concrete （referred to as group A）and 3.63% for SY-Aflyash concrete（（referrd toasgroupB）under theratioof the two groups.Therelative dynamicelastic modulus damage was 35.4% in group A and 27.4% in group B. The strength loss was 30.6% in group A and 21.9% in group B. According tothelifespan，itispredicted thatthelimit willbereachedat345cycles ingroupAand45OcyclesingroupB.The imagemodelconstructedbasedonthe Weibullfunctioncanfectivelydescribetheprocssoflifeloss，reflectthfureointof the structure，and the Weibull function can effectively predict the service life of concrete.

Key words： frost resistance；model prediction； strength loss；dynamic modulus；Quick -freeze method

0 引言

西北属于寒旱区域，建（构）筑物在恶劣环境中，耐久性能损伤远大于内地。（剩余5702字）