混凝土
混凝土
혼응토
CONCRETE
2014年
10期
72-76
,共5页
刘晨霞%陈改新%王秀军%纪国晋
劉晨霞%陳改新%王秀軍%紀國晉
류신하%진개신%왕수군%기국진
混凝土%碱活性%岩相分析%碱-骨料反应
混凝土%堿活性%巖相分析%堿-骨料反應
혼응토%감활성%암상분석%감-골료반응
concrete%alkali reactivity%petrographic analysis%alkali aggregate reaction
采用多种检测方法对某水电工程骨料碱活性进行了研究。岩相法检测结果表明,6个骨料样品中含有一定量的隐晶状石英和隐晶状玻璃质,这两种成分具有潜在的碱-硅酸反应活性。对于XJ-2骨料样品:砂浆棒快速法试验结果表明,该骨料为具有潜在碱-硅酸反应活性的骨料;混凝土棱柱体快速法和混凝土棱柱体法试验结果表明,该骨料属于后期膨胀较快的骨料。对于XJ-4骨料样品:混凝土棱柱体法试验结果表明,棱柱体试件一年膨胀率接近0.04%限值,且试件膨胀率仍继续发展,该骨料也属于后期膨胀较快的骨料,建议给予关注。研究结果为准确判定骨料的碱活性提供了技术支持,为保证工程质量奠定了基础。
採用多種檢測方法對某水電工程骨料堿活性進行瞭研究。巖相法檢測結果錶明,6箇骨料樣品中含有一定量的隱晶狀石英和隱晶狀玻璃質,這兩種成分具有潛在的堿-硅痠反應活性。對于XJ-2骨料樣品:砂漿棒快速法試驗結果錶明,該骨料為具有潛在堿-硅痠反應活性的骨料;混凝土稜柱體快速法和混凝土稜柱體法試驗結果錶明,該骨料屬于後期膨脹較快的骨料。對于XJ-4骨料樣品:混凝土稜柱體法試驗結果錶明,稜柱體試件一年膨脹率接近0.04%限值,且試件膨脹率仍繼續髮展,該骨料也屬于後期膨脹較快的骨料,建議給予關註。研究結果為準確判定骨料的堿活性提供瞭技術支持,為保證工程質量奠定瞭基礎。
채용다충검측방법대모수전공정골료감활성진행료연구。암상법검측결과표명,6개골료양품중함유일정량적은정상석영화은정상파리질,저량충성분구유잠재적감-규산반응활성。대우XJ-2골료양품:사장봉쾌속법시험결과표명,해골료위구유잠재감-규산반응활성적골료;혼응토릉주체쾌속법화혼응토릉주체법시험결과표명,해골료속우후기팽창교쾌적골료。대우XJ-4골료양품:혼응토릉주체법시험결과표명,릉주체시건일년팽창솔접근0.04%한치,차시건팽창솔잉계속발전,해골료야속우후기팽창교쾌적골료,건의급여관주。연구결과위준학판정골료적감활성제공료기술지지,위보증공정질량전정료기출。
Several test methods were adopted to study the alkali reactivity of six aggregate samples from a certain hydraulic project.The test results of petrography method indicated that a certain amount of cryptocrystalline quartz and cryptocrystalline glass was contained in all the six aggregate samples,and both of these two components were potentially alkali-reactive.For aggregate XJ-2,it was judged to be po-tentially alkali reactive in accelerating mortar bar tests,and showed a higher expansion rate in later stage in accelerating concrete prism tests and concrete prism tests.For aggregate XJ-4,its concrete prisms had an annual expansion ratio close to the limit value of 0.04%,and the expansion was also developing quickly in later stage,which deserved our attention.The research results can provide technical support for the accurate judgment of aggregate alkali reactivity,and thus benefit the project quality.test results of accelerating mortar bar method showed that the 28 d expansion ratio of mortar with aggregate XJ-2 was larger than the limit value of 0.2%,and aggregate XJ-2 should be potentially alkali reactive.