Redispersible latex hmoov yog cov khoom siv feem ntau siv cov organic gelling, uas tuaj yeem rov ua kom sib npaug sib npaug hauv dej los tsim cov emulsion tom qab sib cuag nrog dej. Ntxiv cov hmoov av redispersible latex tuaj yeem txhim kho cov dej khaws cia ntawm cov cement mortar tshiab, nrog rau kev sib koom ua ke, kev yooj yim, impermeability thiab corrosion kuj ntawm hardened cement mortar. Cov hmoov latex hloov qhov sib xws thiab slipperiness ntawm lub kaw lus nyob rau hauv lub ntub sib tov lub xeev, thiab cov cohesion yog zoo dua los ntawm kev ntxiv latex hmoov. Tom qab ziab, nws muab cov txheej txheem du thiab ntom ntom nrog lub zog cohesive, thiab txhim kho cov nyhuv cuam tshuam ntawm cov xuab zeb, gravel thiab pores. , enriched rau hauv zaj duab xis ntawm lub interface, uas ua rau cov ntaub ntawv hloov tau yooj yim, txo cov elastic modulus, absorbs thermal deformation kev nyuaj siab mus rau ib tug loj npaum li cas, thiab muaj dej kuj nyob rau hauv lub tom ntej theem, thiab tsis kub thiab khoom deformation yog inconsistent.
Kev tsim cov yeeb yaj kiab polymer txuas ntxiv yog qhov tseem ceeb heev rau kev ua haujlwm ntawm polymer-hloov cement mortars. Thaum lub sij hawm teem thiab hardening txheej txheem ntawm cov cement paste, ntau cov kab noj hniav yuav raug tsim nyob rau hauv, uas dhau los ua qhov tsis muaj zog ntawm cov cement paste. Tom qab cov hmoov latex redispersible ntxiv, cov hmoov latex yuav tam sim ntawd tawg mus rau hauv ib qho emulsion thaum nws ntsib dej, thiab sib sau ua ke hauv thaj chaw dej nplua nuj (uas yog, hauv kab noj hniav). Raws li cov cement paste teem thiab hardens, lub zog ntawm cov khoom polymer yog nce ntxiv, thiab interfacial nro ntawm dej thiab huab cua ua rau lawv maj mam sib haum. Thaum cov ntaub ntawv polymer tuaj rau hauv kev sib cuag nrog ib leeg, lub network ntawm cov dej evaporates los ntawm cov capillaries, thiab cov polymer tsim cov yeeb yaj kiab tas li nyob ib puag ncig cov kab noj hniav, ntxiv dag zog rau cov chaw tsis muaj zog. Lub sijhawm no, cov yeeb yaj kiab polymer tuaj yeem tsis tsuas yog ua lub luag haujlwm hydrophobic, tab sis kuj tsis thaiv lub capillary, kom cov khoom muaj hydrophobicity zoo thiab huab cua permeability.
Cov cement mortar tsis muaj polymer yog xoob heev txuas ua ke. Ntawm qhov tsis sib xws, cov polymer hloov cov cement mortar ua rau tag nrho cov mortar txuas nruj heev vim muaj cov ntaub ntawv polymer, yog li tau txais cov khoom zoo dua qub thiab huab cua tiv thaiv kev sib deev. Nyob rau hauv cov hmoov latex hloov cov cement mortar, cov hmoov latex yuav ua rau cov porosity ntawm cov cement paste, tab sis txo qhov porosity ntawm qhov kev hloov pauv ntawm thaj chaw ntawm cov cement paste thiab cov aggregate, uas ua rau tag nrho cov porosity ntawm cov mortar tsis hloov. Tom qab cov hmoov latex tau tsim rau hauv cov yeeb yaj kiab, nws tuaj yeem thaiv qhov pores hauv mortar zoo dua, ua rau cov qauv ntawm qhov kev hloov pauv ntawm thaj chaw ntawm cov cement paste thiab cov khoom sib xyaw ntau ntom, thiab cov permeability kuj ntawm cov latex hmoov hloov mortar yog txhim kho. , thiab lub peev xwm los tiv thaiv kev yaig ntawm cov xov xwm tsis zoo yog txhim kho. Nws muaj txiaj ntsig zoo rau kev txhim kho cov kav ntev ntawm cov tshuaj khib.
Post lub sij hawm: Mar-14-2023