- 郭 鵬1,程永剛2
2014年第2期
摘要
引用本文
摘??要:研究了高溫養護(80℃熱水養護及后續200~300℃高溫烘箱養護)對活性粉末混凝土(RPC)力學性能的影響。結果表明,烘箱高溫養護顯著提高了RPC混凝土的抗壓強度,而一定程度上降低了抗折強度。通過對高溫養護下失水量、硅酸鹽聚合程度、水化產物能譜分析、孔體積及界面過渡區的研究,認為高溫養護過程中,水泥基體中硅酸鹽聚合度提高,部分水化硅酸鈣轉變成了硬硅鈣石,有利于抗壓強度的提高。而烘箱高溫養護減弱了界面結合強度,使得抗折強度下降。Abstract:Theeffectsofhightemperaturecuring(80℃hotwatercuringand200~300℃ovencuring)onthemechanicalpropertiesofreactivepowderconcrete(RPC)arestudied.TheresultsshowthattheovenhightemperaturecuringcanobviouslyimprovethecompressivestrengthofRPC,butdecreasetheflexuralstrengthtosomeextent.Throughtheresearchonwaterlossunderhightemperature,polymerizationdegreeofsilicate,energyspectrumanalysisofhydrationproducts,porevolumeand?interfacialtransitionzone,itisconsideredthatduringthehightemperaturecuring,thepolymerizationdegreeofsilicateisimproved,somehydrationsilicatecalciumturnstoxonotlite,whichisbeneficialtoimprovingthecompressivestrength.However,theovenhightemperaturecuringdecreasestheinterfacialstrength,whichmakestheflexuralstrengthdecrease.