Lub luag haujlwm ntawm metakaolin hauv cov pob zeb ua vaj tse

(1) Txhim kho lub zog ntawm cov cement slurry thiab mortar, lub zog siab yog ib qho ntawm cov cim qhia ntawm kev ua tau zoo ntawm cov pob zeb ua vaj tse. Ib qho ntawm lub hom phiaj tseem ceeb ntawm kev ntxiv metakaolin yog los txhim kho lub zog ntawm cov cement mortar thiab pob zeb ua vaj tse.

Poon et al. (2001) tau ua qhov kev sim zog compressive ntawm cov cement slurries nrog cov dej cement piv ntawm 0.3, npaj los ntawm kev hloov Portland cement nrog 0-20% (feem pua ​​​​​​ntawm pawg) kaolin thiab silica hmoov. Cov txiaj ntsig tau qhia tias lub zog compressive ntawm cov cement slurries uas muaj 5% txog 20% ​​kaolin siab dua li ntawm cov cement siv rau txhua lub hnub nyoog, nrog rau cov cement uas muaj 10% kaolin qhia txog 20% ​​nce zog ntawm 28 thiab 90 hnub piv rau cov cement siv. Cov cement uas muaj 5% txog 10% silica hmoov kuj qhia txog 20% ​​nce zog ntawm 28 thiab 90 hnub piv rau cov cement siv, Nws lub zog ntawm 28d thiab 90d yog sib npaug rau cov kaolin cement, tab sis nws lub zog thaum ntxov qis dua li cov cement benchmark. Kev tshuaj xyuas qhia tias qhov no yuav cuam tshuam nrog kev sib sau ua ke ntawm cov hmoov silicon siv thiab kev sib xyaw tsis txaus hauv cov cement slurry.

(2) Li Keliang et al. (2005) tau kawm txog cov teebmeem ntawm qhov kub thiab txias ntawm calcination, lub sijhawm calcination, thiab SiO2 thiab A12O3 cov ntsiab lus hauv kaolin ntawm kev ua haujlwm ntawm metakaolin los txhim kho lub zog ntawm cov cement concrete. Cov pob zeb muaj zog thiab cov av polymers tau npaj siv metakaolin. Cov txiaj ntsig qhia tau tias thaum cov ntsiab lus ntawm kaolin yog 15% thiab qhov sib piv ntawm dej cement yog 0.4, lub zog compressive 28 hnub yog 71.9 MPa. Thaum cov ntsiab lus ntawm kaolin yog 10% thiab qhov sib piv ntawm dej cement yog 0.375, lub zog compressive 28 hnub yog 73.9 MPa. Ntxiv mus, thaum cov ntsiab lus ntawm metakaolin yog 10%, nws cov ntsuas kev ua haujlwm ncav cuag 114, uas yog 11.8% siab dua li tib yam ntawm cov hmoov silicon. Yog li ntawd, nws ntseeg tias metakaolin tuaj yeem siv los npaj cov pob zeb muaj zog siab.

Qian Xiaoqian et al. (2001) tau kawm txog kev sib raug zoo ntawm kev ntxhov siab thiab kev ntxhov siab ntawm cov pob zeb ua vaj tse nrog cov ntsiab lus kaolin ntawm 0, 0.5%, 10%, thiab 15%. Lawv pom tias nrog kev nce ntawm cov ntsiab lus kaolin, qhov siab tshaj plaws ntawm lub zog tensile ntawm cov pob zeb ua vaj tse tau nce ntxiv ntau heev, thiab cov qauv tensile elastic tseem tsis tau hloov pauv. Txawm li cas los xij, lub zog compressive ntawm cov pob zeb ua vaj tse tau nce ntxiv ntau heev, thiab qhov piv ntawm lub zog compressive kuj txo qis. Thaum cov ntsiab lus ntawm kaolin yog 15%, lub zog tensile thiab lub zog compressive ntawm cov pob zeb ua vaj tse yog 128% thiab 184% ntawm cov pob zeb siv, raws li.

Cao Zhengliang et al. (2004) pom nyob rau hauv lawv txoj kev tshawb fawb txog kev ua kom muaj zog ntawm cov hmoov ultrafine ntawm metakaolin rau ntawm cov pob zeb ua vaj tse uas, nyob rau hauv tib lub fluidity, mortar uas muaj 10% metakaolin ua rau nws lub zog compressive thiab flexural zog los ntawm 6% txog 8% tom qab 28 hnub. Kev loj hlob ntawm lub zog thaum ntxov ntawm cov pob zeb sib xyaw nrog metakaolin tau sai dua li ntawm cov pob zeb txheem. Piv nrog rau cov pob zeb txheem, cov pob zeb uas muaj 15% metakaolin muaj 84% nce hauv 3D axial compressive zog thiab 80% nce hauv 28d axial compressive zog, thaum lub static elastic modulus muaj 9% nce hauv 3D thiab 8% nce hauv 28d.

Huang Zhan et al. (2008) tau kawm txog qhov cuam tshuam ntawm kev sib xyaw sib txawv ntawm metakaolin thiab slag rau lub zog thiab kev ruaj khov ntawm cov pob zeb ua vaj tse. Cov txiaj ntsig qhia tau hais tias kev ntxiv metakaolin rau hauv cov pob zeb ua vaj tse slag txhim kho ob qho tib si lub zog thiab kev ruaj khov ntawm cov pob zeb ua vaj tse. Qhov piv zoo tshaj plaws ntawm slag rau cement yog nyob ib puag ncig 3: 7, ua rau muaj lub zog zoo tagnrho. Qhov sib txawv ntawm cov pob zeb ua vaj tse sib xyaw yog siab dua me ntsis ntawm cov pob zeb ua vaj tse ib leeg, vim yog cov tshauv volcanic ntawm metakaolin. Nws lub zog tensile sib cais yog siab dua li ntawm cov pob zeb ua vaj tse benchmark.

Yang Fengling et al. (2011) siv cov metakaolin, fly ash, thiab slag sib npaug zos los hloov cement, thiab sib xyaw metakaolin nrog fly ash thiab slag sib cais los npaj cov pob zeb ua vaj tse. Kev ua haujlwm tau zoo, lub zog compressive, thiab kev ruaj khov ntawm cov pob zeb ua vaj tse tau raug kawm. Cov txiaj ntsig tau qhia tias thaum siv kaolin los hloov 5% txog 25% ntawm cov cement hauv cov nqi sib npaug zos, lub zog compressive ntawm cov pob zeb ua vaj tse txhua lub hnub nyoog tau zoo dua; Thaum siv kaolin hauv cov nqi sib npaug zos los hloov cement los ntawm 20%, lub zog compressive ntawm txhua lub hnub nyoog yog qhov zoo tagnrho. Lub zog ntawm 3d, 7d, thiab 28d yog 26.0%, 14.3%, thiab 8.9% siab dua li ntawm cov pob zeb ua vaj tse tsis muaj kaolin ntxiv, raws li. Qhov no qhia tau hais tias rau Hom II Portland cement, kev ntxiv metakaolin tuaj yeem txhim kho lub zog ntawm cov pob zeb ua vaj tse uas tau npaj tseg.

Zhang Chengbo et al. (2012) siv cov hlau slag, metakaolin, thiab lwm yam khoom siv ua cov khoom siv tseem ceeb los npaj cov geopolymer cement los hloov cov Portland cement ib txwm muaj, ua tiav lub hom phiaj ntawm kev txuag hluav taws xob, txo kev siv, thiab hloov cov khib nyiab mus ua khoom muaj nqis. Cov txiaj ntsig tau qhia tias thaum cov hlau thiab cov tshauv ya yog 20%, lub zog ntawm lub thaiv sim ntawm 28 hnub tau mus txog qib siab heev (95.5MPa). Raws li qhov ntau ntawm cov hlau slag ntxiv nce ntxiv, nws kuj tseem tuaj yeem ua lub luag haujlwm hauv kev txo qhov shrinkage ntawm geopolymer cement.

Chen Guocan (2010) tau siv txoj kev siv tshuab "Portland cement + cov khoom siv sib xyaw ua ke + cov neeg ua haujlwm txo dej zoo", cov thev naus laus zis magnetized dej thiab cov txheej txheem npaj ib txwm muaj, thiab ua cov kev sim npaj rau cov pob zeb slag uas muaj zog tsawg-carbon siv cov khoom siv raw hauv zos xws li pob zeb thiab slag. Cov txiaj ntsig qhia tau tias qhov ntau npaum li cas ntawm metakaolin yog 10%. Qhov sib piv ntawm qhov hnyav rau lub zog ntawm cov cement rau ib chav tsev ntawm cov pob zeb slag uas muaj zog heev yog li 4.17 npaug ntawm cov pob zeb ib txwm muaj, 2.49 npaug ntawm cov pob zeb muaj zog heev (HSC), thiab 2.02 npaug ntawm cov hmoov av reactive (RPC). Yog li ntawd, cov pob zeb slag uas muaj zog heev uas npaj nrog cov cement tsawg yog qhov kev coj ua ntawm kev txhim kho pob zeb hauv lub sijhawm kev lag luam uas muaj carbon tsawg.

(3) Tom qab ntxiv kaolin uas tiv taus te rau hauv cov pob zeb ua vaj tse, qhov loj ntawm cov pob zeb ua vaj tse raug txo qis heev, txhim kho lub voj voog khov-thaw ntawm cov pob zeb ua vaj tse. Feng Naiqian (2002) pom tias nyob rau hauv qee qhov ntawm cov voj voog khov-thaw, cov qauv elastic ntawm cov qauv pob zeb ua vaj tse nrog 15% kaolin cov ntsiab lus ntawm 28 hnub ntawm hnub nyoog yog siab dua li ntawm cov pob zeb siv piv txwv ntawm 28 hnub ntawm hnub nyoog. Kev siv cov metakaolin thiab lwm yam hmoov av ultrafine hauv cov pob zeb ua vaj tse tuaj yeem txhim kho kev ua haujlwm ruaj khov ntawm cov pob zeb ua vaj tse.