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1、學(xué)兔兔www.xuetutu.com第13卷第6期建筑材料學(xué)報(bào)Vo1.13,NO.62010年l2月JOURNALOFBUILDINGMATERIALSDec.,ZOl0文章編號(hào):1007—9629(2010)06—0722—06不同干燥條件對(duì)混凝土導(dǎo)電量的影響王中平,王振,侯旭良,徐俊,黃晨明(1.同濟(jì)大學(xué)先進(jìn)土木工程材料教育部重點(diǎn)實(shí)驗(yàn)室,上海200092;2.上海港灣工程質(zhì)量檢測(cè)有限公司,上海200032)摘要:采用ASTMC1202<<混凝土抵抗氯離子滲透能力的電量評(píng)價(jià)方法》,研究了不同干燥條件對(duì)混凝土導(dǎo)電量的影響;在電量試驗(yàn)結(jié)束后,檢測(cè)
2、了氯離子的遷移量和氯離子滲透深度.結(jié)果表明:60℃,7d的干燥條件對(duì)水膠比小于0.42且不摻礦物摻和料的基準(zhǔn)混凝土及水膠比小于0.49但摻加礦物摻和料的混凝土導(dǎo)電量影響很小,該條件可以作為氣體滲透試驗(yàn)的干燥條件;105℃的干燥處理需要慎重,因?yàn)樵摋l件會(huì)導(dǎo)致混凝土導(dǎo)電量及氯離子遷移量明顯增加,混凝土抗?jié)B性能變差;對(duì)于電量試驗(yàn)后氯離子滲透深度貫穿的試樣,導(dǎo)電量評(píng)價(jià)標(biāo)準(zhǔn)已不適于評(píng)價(jià)此類試樣的滲透性能,可以考慮將氯離子遷移量或試樣的飽水量作為評(píng)價(jià)其滲透性能的一個(gè)定量指標(biāo).關(guān)鍵詞:混凝土;干燥;微裂紋;導(dǎo)電量;氯離子遷移量中圖分類號(hào):TU528.01文獻(xiàn)
3、標(biāo)志碼:Adoi:10.3969/j.issn.1007—9629.2010.06.004EffectsofDifferentDryingConditionsonChargePassedthroughConcreteWANGZhong—ping,WANGZhen,Ho【,X一liang,X【,Jun,HUANGChen—ruing(1.KeyLaboratoryofAdvancedCivilEngineeringMaterialsofMinistryofEducation,Ton~iUniversity,Shanghai200092,China
4、;2.ShanghaiHarborEngineeringQualityControlandTestingCo.,Ltd.,Shanghai200032,China)Abstract:TheeffectsofdifferentdryingconditionsonchargepassedthroughconcretewereinvestigatedbyASTMC1202Method,thechloride-ionmigrationamountandchloride-ionpenetrationdepthweremeas—ured.Theresult
5、sshowthatthedryingconditionof60℃(7d)haslittleeffectonthenormalconcretewithwater—binderratioof1essthan0.42andthemineraladmixturemodifiedconcretewithwater~binderratiooflessthan0.49,thisconditioncanbeusedasthedryingphaseofgaspermeabilitytest.Inaddition,thedryingconditionof105℃(
6、7d)willcausethechargepassedandthechloride—ionmigrationamountim—provedobviously,andthedeteriorationofconcreteimpermeability.Theevaluationcriteriaofchargepas—sedisnotsuitableforevaluatingthespecimenswhosechloride—ionpenetratingdepthreachedthethicknessofthespecimens;thechloride
7、—ionmigrationamountorthesaturatedwatercontentofdryingspecimenscanbeconsideredasthequantitativeindexesofconcretepermeability.Keywords:concrete;drying;micro—crack;chargepassed;chloride—ionmigrationamount在對(duì)混凝土進(jìn)行氣體滲透試驗(yàn)時(shí),測(cè)試結(jié)果對(duì)件下進(jìn)行,這是兼顧速率、能耗和效率的合理參數(shù).試樣內(nèi)部的濕度非常敏感,需要對(duì)試樣進(jìn)行干燥處按照已有的觀點(diǎn),3
8、0~120℃時(shí)凝膠孔和毛細(xì)孔中理,以排除自由水分的干擾.不同學(xué)者的干燥處理方的自由水蒸發(fā),混凝土固相表面的吸附束縛水蒸發(fā);式不盡相同,溫度從35~11