Kwiminyaka yakutshanje, ishishini lokwakha libone utshintsho olukhulu ekusebenziseni ikhonkrithi esebenza kakhulu ukuhlangabezana neemfuno ezifunekayo zeprojekthi zeziseko zophuhliso zanamhlanje. Esinye sezithako eziphambili zekhonkrithi esebenza kakhulu yi-binder, edibanisa amasuntswana ahlanganisiweyo ukuze yenze i-matrix yekhonkrithi eqinileyo nehlala ixesha elide. Phakathi kweentlobo ezahlukeneyo ze-adhesives, ukusetyenziswa kwe-polymeric adhesives kuye kwathandwa ngenxa yokukwazi kwayo ukunika iimpawu ezinqwenelekayo ezifana nokuqina okwandisiweyo kunye nokuguquguquka.
Enye yezona zibopheleli zepolymer ezisetyenziswa kakhulu kwikhonkrithi esebenza kakhulu yi-RDP (Redispersible Polymer Powder) polymer binder. Izibopheleli ze-RDP polymer ziimpuphu zomxube owomileyo ezinokuxutywa ngokulula nezinye izithako ukwenza imixube yekhonkrithi enokuguquguquka okwandisiweyo kunye nokumelana namanzi. Ukongeza izibopheleli ze-RDP polymer kwikhonkrithi kuluncedo kakhulu xa kusetyenzwa apho ikhonkrithi kulindeleke ukuba ibe phantsi koxinzelelo olukhulu okanye idlule kwimijikelo ephindaphindayo yokwanda kunye nokuncitshiswa.
Enye yezona nzuzo ziphambili zee-adhesive ze-RDP polymer ziimpawu zazo zokubopha eziphuculweyo. Izihlanganisi ze-RDP polymer ziqulethe ii-arhente zeekhemikhali ezizinceda zinamathele kakhulu kwiinxalenye ezihlanganisiweyo kunye nezinye izinto ezikumxube wekhonkrithi. Oku kwenza i-matrix yekhonkrithi ibe namandla kwaye ihlale ixesha elide, imelana nomonakalo ovela kumandla angaphandle afana nemijikelo yokuqandisa, ukukrala kunye nefuthe.
Enye inzuzo yezihlanganisi ze-RDP polymer kukukwazi kwazo ukwandisa ukuguquguquka kwemixes zekhonkrithi. Imixube yekhonkrithi yendabuko idla ngokuba buthathaka kwaye ithambekele ekuqhekekeni xa iphantsi koxinzelelo oluphezulu okanye utshintsho lobushushu. Izihlanganisi ze-RDP polymer zinokuguqulwa ukuze zenze amanqanaba ahlukeneyo okuguquguquka, okuvumela umxube wekhonkrithi ukuba umelane ngcono noxinzelelo ngaphandle kokuqhekeka. Oku kuguquguquka okwandisiweyo kukwanciphisa umngcipheko wokuqhekeka okanye ezinye iintlobo zomonakalo ngexesha lokwakhiwa okanye ukusetyenziswa.
Ukongeza ekuqinisekiseni ukuqina kunye nokuguquguquka okukhulu, izincamathelisi ze-RDP polymer zikwamelana kakhulu nokufuma. Izakhiwo zekhonkrithi ezivezwa emanzini okanye kufuma ixesha elide zinokubangela iingxaki ezahlukeneyo, kubandakanya ukuqhekeka, ukuqhekeka kunye nokugqwala. Izibopheleli ze-RDP polymer ziqulethe ii-arhente ezingafuni manzi ezinceda ekugxotheni ukufuma, ukunciphisa umngcipheko wezi ngxaki kunye nokuphucula ukusebenza kwexesha elide kwezakhiwo zekhonkrithi.
Ukusetyenziswa kwezincamathelisi ze-RDP polymer nako kunobuhlobo nokusingqongileyo. Ngokungafaniyo nemixube yekhonkrithi yendabuko, edla ngokufuna isixa esikhulu sesamente yasePortland, umthombo omkhulu wokukhutshwa kwekhabhoni, izihlanganisi ze-RDP polymer zinokusebenzisa isixa esincinci ukufikelela kwinqanaba elifanayo lokusebenza. Oku kunciphisa umngcipheko wekhabhoni womxube wekhonkrithi kwaye kunceda ukunciphisa impembelelo yokusingqongileyo yokwakha.
Nangona zininzi iingenelo zazo, kukho imingeni ethile enxulumene nokusebenzisa izihlanganisi ze-RDP polymer kwikhonkrithi. Omnye wemingeni emikhulu kukufuneka ulawule ngononophelo umthamo kunye nokuxuba izihlanganisi ze-polymer ukuqinisekisa ukusebenza kakuhle. I-binder encinci kakhulu ibangela ukunamathela okuncinci kunye nokuqina okuncinci, ngelixa i-binder eninzi kakhulu ibangela amandla aphantsi kunye nokusebenza okuncinci. Ke ngoko, kubalulekile ukusebenza nomthengisi wekhonkrithi onamava oqondayo iipropati zezihlanganisi ze-RDP polymer kwaye anokunceda ukuphucula ukusetyenziswa kwazo kwizicelo ezithile.
Kukho iingenelo ezininzi zokusebenzisa ii-RDP polymer binders kwikhonkrithi esebenza kakhulu. Iyandisa ukuqina kunye nokuguquguquka komxube wekhonkrithi, iphucula ukumelana kwayo nokufuma, kwaye inempembelelo ephantsi kwindalo esingqongileyo kuneekhonkrithi zemveli. Nangona ukusetyenziswa kwazo kuzisa imingeni ethile, ukuhlanganisa ngononophelo kunye nokuxuba kunokuvelisa iziphumo ezigqwesileyo kwaye kukhokelele ekudalweni kwezakhiwo zekhonkrithi eziqinileyo nezihlala ixesha elide. Ii-adhesive ze-RDP polymer lukhetho oluhle kakhulu kwabo bafuna ukwakha izakhiwo zekhonkrithi ezinokumelana neemeko ezinzima kwaye zibonelele ngokusebenza okuthembekileyo ngokuhamba kwexesha.
Ixesha lokuthumela: Okthobha-16-2023