I-accelerating admixtures ye-concrete izongezo zekhemikhali ezisetyenziselwa ukukhawuleza ukubeka kunye nokuqina kwenkqubo yekhonkrithi. Ezi zidibanisi ziluncedo ngakumbi kumaqondo obushushu abandayo okanye kwiimeko apho ikhonkrithi ifuna ukusetwa ngokukhawuleza, njengakwimeko yolungiso olungxamisekileyo okanye iiprojekthi zokwakha ezithatha ixesha.

Kukho iintlobo ezimbini eziphambili zokukhawulezisa i-admixtures yekhonkrithi: i-chloride-based and non-chloride-based. Imixube esekwe kwi-chloride, ehlala ine-calcium chloride okanye i-sodium chloride, zezona zinto zixhaphakileyo nezisebenzayo zokukhawulezisa ii-admixtures. Nangona kunjalo, ngenxa yokukwazi kwabo ukubangela ukubola kwensimbi yokuqinisa, kufuneka isetyenziswe kuphela kwikhonkrithi engaqinisiweyo okanye kwiimeko apho ukuqiniswa kukhuselwe ngokwaneleyo. I-non-chloride-based accelerating admixtures, ehlala iqulethe i-calcium nitrate okanye i-calcium formate, yenye indlela ekhuselekileyo kwaye inokusetyenziswa kwikhonkrithi eyomeleziweyo.

Indlela i-Accelerating Admixtures isebenza ngayo

I-accelerating admixtures isebenza ngokwandisa izinga le-chemical reaction eyenzeka phakathi kwesamente kunye namanzi kumxube wekhonkrithi. Oku kusabela, kwaziwa ngokuba yi-hydration, yiyo eyenza umxube uqine kwaye ufumane amandla.

Xa i-admixture ekhawulezayo yongezwa kumxube wekhonkrithi, yenza njenge-catalyst, ukukhawuleza inkqubo ye-hydration kunye nokuvumela ikhonkrithi ukuba ibeke kwaye ilukhuni ngokukhawuleza. Indlela ethile yokukhawulezisa i-admixtures isebenza iyahluka ngokuxhomekeke kuhlobo lwe-admixture esetyenzisiweyo. I-admixtures esekelwe kwi-chloride isebenza ngokunciphisa indawo yokukhenkceza yamanzi kumxube wekhonkrithi, ivumela ukuba ibeke kwaye iqine kumaqondo aphantsi. I-admixtures engekho-chloride-based based admixtures isebenza ngokukhawulezisa ukubunjwa kwe-calcium silicate hydrate (CSH) gel, eyona nto ibalulekileyo ejongene namandla ekhonkrithi.

Iinzuzo zokuKhawulezisa ii-Admixtures

1. Ukuseta ngokukhawuleza kunye nokuqina

Inzuzo ephambili yokukhawulezisa i-admixtures yekhonkrithi kukuba bakhawuleza ukuseta kunye nokuqina kwenkqubo yomxube. Oku kuvumela amaxesha okwakha akhawulezayo kunye nokugqitywa ngokukhawuleza kweeprojekthi ezithatha ixesha.

2. Ukuphuculwa kokuSebenza kweMozulu ebandayo

I-accelerating admixtures iluncedo kakhulu kwiimeko ezibandayo zemozulu, apho ikhonkrithi inokuthatha ixesha elide ukuseta kunye nokuqina. Ngokukhawulezisa inkqubo ye-hydration, ezi zidibaniselwano zivumela ikhonkrithi ukuba igalelwe kwaye ibekwe kumaqondo aphantsi.

3. Amandla Ongeziweyo

Ukongeza kokukhawulezisa ukuseta kunye nenkqubo yokuqina, ezinye ii-admixtures ezikhawulezayo zinokuphucula amandla ekhonkrithi egqityiweyo. Oku kungenxa yokuba bakhuthaza ukubunjwa kwejeli ye-CSH, eyona nxalenye ephambili ejongene namandla ekhonkrithi.

4. Iindleko eziNcitshisiweyo

Ukusebenzisa ii-admixtures ezikhawulezayo kunokunceda ukunciphisa iindleko zizonke zeeprojekthi zokwakha ngokukhawulezisa amaxesha okwakha kunye nokuvumela ukugqitywa ngokukhawuleza kweeprojekthi. Oku kunokubangela ukongiwa kwiindleko zomsebenzi nezinye iindleko ezinxulumene nokwakha.

Imida yokuKhawulezisa imixube

1. Umngcipheko woMhlwa

Ukusetyenziswa kwe-chloride-based acceleratingimixubekwikhonkrithi eyomeleziweyo inokunyusa umngcipheko wokugqwala kokuqiniswa kwensimbi. Oku kungenza buthathaka isakhiwo sekhonkrithi kwaye kubangele ukulungiswa kweendleko.

2. UkuNcitshiswa kokuSebenza

Ukongeza i-admixture ekhawulezayo kwikhonkrithi kunokunciphisa ukusebenza kwayo, okwenza kube nzima ukuxuba kunye nokugalela. Oku kunokukhokelela kwiindleko ezongezelelweyo zomsebenzi kunye nezixhobo.

3. Ubomi beShelf obunyiniweyo

Ii-admixtures ezikhawulezayo zinobomi obulinganiselweyo beshelufu kwaye zinokuphulukana nokusebenza kwazo ngokuhamba kwexesha. Oku kunokubangela imfuno yokudibanisa okongeziweyo ukuba yongezwe kumxube wekhonkrithi, onokunyusa iindleko.

4. Enokubakho kwi-cracking

Ukukhawuleza i-admixtures kunokubangela ukuba ikhonkrithi ibekwe kwaye ilukhuni ngokukhawuleza, enokunyusa umngcipheko wokuqhekeka ukuba umxube awunyangeki kakuhle kwaye uqiniswe.

Ukuqukumbela

I-accelerating admixtures yekhonkrithi sisixhobo esisebenzayo sokukhawulezisa ukuseta kunye nokuqina kwenkqubo yekhonkrithi. Ziluncedo ngakumbi kumaqondo obushushu abandayo kunye neeprojekthi zokwakha ezithatha ixesha, ezivumela amaxesha okugqiba ngokukhawuleza kunye nokunciphisa iindleko zomsebenzi. Nangona kunjalo, ukusetyenziswa kwe-chloride-based admixtures kwikhonkrithi eyomeleziweyo kunokunyusa umngcipheko wokubola, kunye ne-non-chloride-based admixtures inokunciphisa ukusebenza komxube. I-admixtures ekhawulezayo nayo inobomi obunqamlekileyo beshelufu kwaye inokunyusa umngcipheko wokuqhekeka ukuba umxube awunyangeki kakuhle kwaye uqiniswe. Ngaphandle kwale mida, ukudibanisa okukhawulezileyo kuhlala kusisixhobo esibalulekileyo kwiikontraka kunye neenjineli ezijonge ukukhawulezisa inkqubo yokwakha kunye nokuphucula ukusebenza kwezakhiwo zekhonkrithi.