I-redispersible latex powder yinto esetyenziswa ngokuqhelekileyo i-organic gelling material, enokuthi iphinde ihlakazwe ngokulinganayo emanzini ukuze yenze i-emulsion emva kokudibana namanzi. Ukongeza umgubo we-latex odityanisiweyo unokuphucula ukusebenza kokugcinwa kwamanzi kwidaka le-samente esandula ukuxutywa, kunye nokusebenza kwebhondi, ukuguquguquka, ukungagungqi kunye nokuxhathisa ukubola kodaka lwesamente olukhuni. I-latex powder iguqula ukuhambelana kunye ne-slipperiness yenkqubo kwimeko yokuxuba okumanzi, kwaye ukudibanisa kuphuculwe ngokudibanisa i-latex powder. Emva kokumisa, inika umaleko ogudileyo kunye noxineneyo womphezulu ngamandla adibeneyo, kwaye iphucula isiphumo sojongano lwesanti, igrabile kunye neepores. , ityetyiswe kwifilimu kwi-interface, eyenza ukuba izinto eziphathekayo ziguquguquke, zinciphisa i-elastic modulus, zithatha uxinzelelo lwe-thermal deformation kumlinganiselo omkhulu, kwaye zinokumelana kwamanzi kwinqanaba elilandelayo, kunye nokushisa kwe-buffer kunye nokuguqulwa kwezinto eziphathekayo azihambelani.
Ukuqulunqwa kwefilimu yepolymer eqhubekayo kubaluleke kakhulu ekusebenzeni kwe-polymer-modified cement mortars. Ngethuba lokumisela kunye nenkqubo yokuqina kwe-cement paste, i-cavities ezininzi ziya kuveliswa ngaphakathi, eziye zibe ziindawo ezibuthathaka ze-cement paste. Emva kokuba i-latex powder yongezwa kwakhona, i-latex powder iya kusasaza ngokukhawuleza ibe yi-emulsion xa idibana namanzi, kwaye iqokelele kwindawo enobuncwane bamanzi (oko kukuthi, kwi-cavity). Njengoko intlama yesamente iseti kwaye iqina, ukuhamba kwamasuntswana epolymer kuya kuthintelwa ngakumbi, kwaye ukuxinana kobuso phakathi kwamanzi nomoya kuyawanyanzela ukuba alungelelanise ngokuthe ngcembe. Xa iinqununu ze-polymer zidibana nomnye, umnatha wamanzi uphuphuma ngama-capillaries, kwaye i-polymer yenza ifilimu eqhubekayo ejikeleze i-cavity, iqinisa la mabala abuthathaka. Ngeli xesha, ifilimu ye-polymer ayinakudlala indima ye-hydrophobic kuphela, kodwa ingavimbeli i-capillary, ukwenzela ukuba izinto eziphathekayo zibe ne-hydrophobicity enhle kunye ne-air permeability.
Udaka lwesamente ngaphandle kwepolymer ludityaniswe ngokukhululekileyo kunye. Ngokuchasene noko, udaka lwesamente olulungisiweyo lwepolymer lwenza udaka lonke ludityaniswe ngokuqinileyo ngenxa yobukho befilimu yepolymer, ngaloo ndlela ifumana iipropathi ezingcono zoomatshini kunye nesondo sokumelana nemozulu. Kwi-latex powder modified sement mortar, i-latex powder iya kwandisa i-porosity ye-cement paste, kodwa inciphise i-porosity ye-interface transition zone phakathi kwe-cement paste kunye ne-aggregate, okubangela ukuba i-porosity yonke yodaka ingatshintshi. Emva kokuba i-latex powder yenziwe ifilimu, inokuthi ithintele ngcono i-pores kudaka, yenza ulwakhiwo lwezone yenguqu ye-interface phakathi kwentlama yesamente kunye ne-aggregate exinene ngakumbi, kwaye ukunyanzeliswa kwe-latex powder modified mortar kuyaphuculwa. , kunye nokukwazi ukuxhathisa ukukhukuliseka kweendaba eziyingozi ziphuculwe. Inefuthe elihle ekuphuculeni ukuqina kodaka.
Ixesha lokuposa: Mar-14-2023