Cov hmoov latex uas tawg tau dua yog cov khoom siv organic gelling uas siv ntau, uas tuaj yeem tawg rov qab sib npaug hauv dej los ua cov emulsion tom qab kov dej. Ntxiv cov hmoov latex uas tawg tau dua tuaj yeem txhim kho kev ua haujlwm ntawm cov cement mortar sib xyaw tshiab, nrog rau kev ua haujlwm sib txuas, kev ywj pheej, kev tsis nkag thiab kev tiv thaiv corrosion ntawm cov cement mortar khov. Cov hmoov latex hloov qhov sib xws thiab kev nplua ntawm lub kaw lus hauv lub xeev sib tov ntub, thiab kev sib koom ua ke tau zoo dua los ntawm kev ntxiv cov hmoov latex. Tom qab ziab, nws muab cov txheej txheem du thiab ntom nrog lub zog sib koom ua ke, thiab txhim kho qhov cuam tshuam ntawm cov xuab zeb, pob zeb thiab qhov hws. , nplua nuj rau hauv zaj duab xis ntawm qhov sib koom ua ke, uas ua rau cov khoom siv yooj ywm dua, txo cov modulus elastic, nqus cov kev ntxhov siab thermal deformation rau ntau qhov, thiab muaj kev tiv thaiv dej hauv theem tom qab, thiab qhov kub ntawm buffer thiab cov khoom deformation tsis sib xws.
Kev tsim cov zaj duab xis polymer txuas ntxiv mus tas li yog qhov tseem ceeb heev rau kev ua haujlwm ntawm cov cement mortars uas hloov kho los ntawm polymer. Thaum lub sijhawm teeb tsa thiab ua kom tawv ntawm cov cement paste, ntau qhov yuav tsim tawm sab hauv, uas dhau los ua qhov tsis muaj zog ntawm cov cement paste. Tom qab ntxiv cov hmoov latex uas rov ua dua tshiab, cov hmoov latex yuav tawg mus rau hauv cov emulsion thaum nws ntsib dej, thiab sib sau ua ke hauv thaj chaw muaj dej ntau (uas yog, hauv qhov). Thaum cov cement paste teeb tsa thiab tawv, kev txav mus los ntawm cov polymer me me raug txwv ntau zuj zus, thiab kev sib txhuam ntawm dej thiab cua yuam kom lawv maj mam sib dhos. Thaum cov polymer me me sib cuag, lub network ntawm dej yuav yaj los ntawm cov hlab ntsha capillaries, thiab cov polymer tsim cov zaj duab xis txuas ntxiv mus tas li nyob ib puag ncig cov qhov, ua kom cov chaw tsis muaj zog no muaj zog. Lub sijhawm no, cov zaj duab xis polymer tsis tsuas yog ua lub luag haujlwm hydrophobic xwb, tab sis kuj tsis thaiv cov capillary, yog li cov khoom siv muaj hydrophobicity zoo thiab huab cua permeability.
Cov cement mortar uas tsis muaj polymer feem ntau txuas ua ke tsis nruj heev. Ntawm qhov tod tes, cov polymer modified cement mortar ua rau tag nrho cov mortar txuas nruj heev vim muaj cov zaj duab xis polymer, yog li tau txais cov khoom siv kho tshuab zoo dua thiab tiv taus huab cua. Hauv cov hmoov latex modified cement mortar, cov hmoov latex yuav ua rau cov cement paste porosity ntau dua, tab sis txo qhov porosity ntawm thaj chaw hloov pauv ntawm cov cement paste thiab cov pob zeb, ua rau tag nrho cov porosity ntawm cov mortar tsis hloov pauv. Tom qab cov hmoov latex raug tsim ua zaj duab xis, nws tuaj yeem thaiv cov qhov hws hauv cov mortar zoo dua, ua rau cov qauv ntawm thaj chaw hloov pauv ntawm cov cement paste thiab cov pob zeb ntom dua, thiab qhov permeability ntawm cov hmoov latex modified mortar tau zoo dua, thiab lub peev xwm los tiv taus kev yaig ntawm cov xov xwm phem tau zoo dua. Nws muaj txiaj ntsig zoo rau kev txhim kho lub zog ntawm mortar.
Lub sijhawm tshaj tawm: Lub Peb Hlis-14-2023