煤矸石粗骨料混凝土抗氯盐侵蚀性能影响分析

打开文本图片集

中图分类号：TU528 文献标志码：A 文章编号：1005-8249（2025）04-0029-06

DOI：10.19860/j.cnki.issn1005-8249.2025.04.006

SHI Yanzhong1，2

（1.Shenmu Vocational & Technical College， Shenmu 7193OO，China; 2. Xi'an University of Architecture and Technology，Xi'an，710o55，China）

Abstract：Toexpandtheutilizationscenariosofcoalgangue，asolid waste fromthecoalindustry，intheconstructionsector， reducetheconsumption of natural building materials，and minimize environmental polution，coal ganguewasused to prepare coarseagregatesasasubstitutefornaturalcrushedstone.Flyashandsilica fumewereemployedasreinforcing mineral materialstoproducecoalgangueconcrete.Thisstudy investigatedthemechanismandimpactof wet-drycyclesonthe resistanceofcoal gangueconcrete tochloridesalterosion.Theresultsshowed that asthenumberofwet-drycycles of chloride salterosionincreased，thecompresivestrengthofcoalgangueconcretefrstincreasedandendecreased，whileteassloss rate first decreased and then increased.The relative dynamic elastic modulus of concrete with 25% and 50% coal gangue replacementratesfirst increasedandthendecreased，andthefreechlorideioncontentatthesamedepthcontinuously increased. With anincreaseinthecoal ganguereplacementrate，after15Owet-drycycles，thecompresivestrengthandrelative dynamic elasticmodulusdecreased，whilethemasslossrateandfreechlorideioncontentinreased.Duetothereinforcingeectsoffly ash and silica fume， the chloride erosion resistance of concrete with 25% and 50% coal gangue replacement rates exceeded that of

natural crushed stone concrete.However，when the replacement rate exceeded 50% ，the chloride erosion resistance decreased rapidly.Theresearchfindingsprovidetheoreticalsupportfortheapplicationofcoalgangueconreteinchlordeerosioneviroments. Key words： gangue coarse aggregate；concrete；wet and dry cycles；chlorine salt erosion；deterioration pattern

0 引言

煤矸石是煤炭开采过程中产生的固体废弃物，其具有与天然骨料相似的性质[1-2]，将其作为骨料掺入混凝土中，不仅可降低天然骨料的用量，更是促进煤矸石大规模利用的有效途径[3]；天然砂石材料属于不可再生资源，采用煤矸石替代天然砂石生产煤矸石混凝土，不仅可实现固废资源合理化利用，降低天然砂石的需求压力，亦可解决当地环保问题。（剩余7554字）