Idethi Yokuthumela: 13, Sep, 2022
Izinzuzo ezibalulekile zobuchwepheshe nezomnotho ze-ejenti yokungenisa umoya esetshenziswa kukhonkolo yezentengiselwano
Ingxube yokungenisa umoya iyingxube engakhiqiza inqwaba yamabhamuza amancane, aminyene futhi azinzile lapho exutshwe kukhonkolo. Ukuqina okufana nokumelana nesithwathwa nokungangenisi. Ukwengezwa kwe-ejenti yokungenisa umoya kukhonkolo yezentengiselwano kungavimbela i-adsorption yesibili yezinhlayiya ze-cement ezihlakazekile kukhonkolo futhi kuthuthukise ukusebenza kokugcinwa kwe-slump kokhonkolo wezohwebo. Njengamanje, i-ejenti yokungenisa umoya ingenye yezingxenye ezibalulekile ekuhlanganiseni kukakhonkolo wezentengiselwano (ezinye zinciphisa amanzi kanye ne-retarder). EJapane nasemazweni asentshonalanga, cishe akukho ukhonkolo ngaphandle kwe-ejenti yokungenisa umoya. EJapane, ukhonkolo ngaphandle kwe-ejenti yokungenisa umoya ubizwa ngokuthi ukhonkolo okhethekile (njengokhonkolo ovuzayo, njll.).
I-air-entraining izothinta amandla okhonkolo, okubhekisela emiphumeleni yokuhlolwa ngaphansi kwesimo sokhonkolo kanye nosimende wamanzi. Lapho okuqukethwe komoya kukhuphuka ngo-1%, amandla kakhonkolo azoncishiswa ngo-4% kuya ku-6%, futhi ukwengezwa kwe-ejenti yokungenisa umoya kuzonciphisa amandla kakhonkolo. Izinga lamanzi lenyuke kakhulu. Ihlolwe nge-superplasticizer esekwe ku-naphthalene. Uma izinga lokunciphisa amanzi ngokhonkolo liyi-15.5%, izinga lokunciphisa amanzi likakhonkolo lifinyelela ngaphezu kwama-20% ngemva kokwengeza inani elincane kakhulu le-ejenti yokungenisa umoya, okungukuthi, izinga lokunciphisa amanzi likhuphuka ngo-4.5%. Kuwo wonke ama-1% okukhula kwezinga lamanzi, amandla kakhonkolo azokwenyuka ngo-2% ukuya ku-4%. Ngakho-ke, inqobo nje uma inani le-air-entraining
i-ejenti ilawulwa ngokuqinile, hhayi kuphela amandla okukhonkolo ngeke anciphise, kodwa azokwanda. Ukulawulwa kokuqukethwe komoya, izivivinyo eziningi zibonise ukuthi okuqukethwe komoya kokhonkolo okunamandla aphansi kulawulwa ku-5%, ukhonkolo wamandla aphakathi ulawulwa ku-4% kuya ku-5%, futhi ukhonkolo wamandla aphezulu ulawulwa ku-3. %, futhi amandla okhonkolo ngeke anciphe. . Ngoba i-ejenti yokungenisa umoya inemiphumela ehlukene emandleni kakhonkolo ngezilinganiso ezahlukene zamanzi-usimende.
Uma kucatshangelwa umphumela wokunciphisa amanzi we-ejenti yokungenisa umoya, lapho ulungiselela i-admixture yekhonkrithi yezentengiselwano, uketshezi lukamama lwe-ejenti yokunciphisa amanzi lungancishiswa kakhulu, futhi inzuzo yezomnotho inkulu.
Isikhathi sokuthumela: Sep-14-2022
