I-Concrete Admixtures: Izinhlobo, Imisebenzi, kanye Nezicelo

Isingeniso

Ukhonkolo uwumgogodla wengqalasizinda yesimanje, eyakha isisekelo sesakhiwo sezakhiwo, imigwaqo, amabhuloho, imigudu, amadamu, nokunye. Ukusetshenziswa kwayo okusabalele kungenxa yamandla ayo acindezelayo aphezulu, ukuguquguquka, kanye nokusebenza kahle kwezindleko. izithako eziyisisekelo zikakhonkolo—usimende, amanzi, nezilinganiso—ngokuvamile zidinga ukuguqulwa ukuze kuhlangatshezwane nezidingo ezithile zokusebenza nemvelo. Lapha kulaphoizingxube zikakhonkolodlala indima ebalulekile.

Izixube zikakhonkolokungamakhemikhali emvelo noma akhiqiziwe noma izithasiselo ezengezwe kungxube kakhonkolo ngaphambi noma ngesikhathi sokuxutshwa ukuze kulungiswe izici zayo esimweni esisha noma esiqinile. Zisetshenziselwa ukuthuthukisa ukusebenza, isikhathi sokusetha, amandla, ukuqina, ukumelana nokuchayeka kwemvelo, ngisho nobuhle. Lesi sihloko sicubungula ngezigaba, izindlela, izinzuzo, kanye nokusetshenziswa kwezixube, sinikeza ukubheka okuningiliziwe ngeqhaza lazo elibalulekile ekwakhiweni kwesimanje.

Ukuhlukaniswa kweUkhonkolo Admixtures

Ama-Admixtures ngokuvamile ahlukaniswa ngezigaba ezimbili ezinkulu:

1. Izithako zamakhemikhali

Lawa ngamakhemikhali ancibilikayo emanzini ashintsha ukuziphatha kukakhonkolo. Izinhlobo ezijwayelekile zifaka:

• Izingxube ezinciphisa amanzi

• Ibuyisela emuva izingxube

• Ukusheshisa izixube

• Ama-Superplasticizers (Izinciphisi zamanzi ezisezingeni eliphezulu)

• Ukungenisa umoyaamanxusa

• Ama-Corrosion inhibitors

• Izingxube ezinciphisa ukushwabana

• I-alkali-silica reaction inhibitors

2. Izixube zamaminerali (noma i-Supplementary Cementitious).

Lezi izinto ezinhle, ngokuvamile ezikhiqizwa yizimboni, ezithatha indawo yengxenye kasimende wase-Portland:

• Fly umlotha

• I-Ground granulated blast furnace slag (GGBFS)

• I-silica intuthu

• I-Metakaolin

• Umlotha wekhoba lelayisi

Izixube Zamakhemikhali kanye Nemisebenzi Yazo

1. Izixube Ezinciphisa Amanzi

Inhloso: Ukunciphisa okuqukethwe kwamanzi kungxube kakhonkolo ngaphandle kokuphazamisa ukusebenza.

Izinhlobo:

• Okuvamile: Yehlisa amanzi ngo-5–10%

• Ibanga eliphakathi: Yehlisa amanzi ngo-6–12%

• Ibanga eliphezulu (Ama-Superplasticizers): Yehlisa amanzi aze afike ku-30%

Compounds Common:

• I-Lignosulfonates

• I-Naphthalene sulfonates

• I-Polycarboxylate ethers (PCEs)

Izinhlelo zokusebenza:

• Ukhonkolo olungile

• Izakhi ze-Precast

• Ukhonkolo osebenza kahle kakhulu

Izinzuzo:

• Amandla angeziwe

• I-permeability ephansi

• Ukuqina okuthuthukisiwe

2. I-Admixtures ehlehliswayo

Inhloso: Ukunciphisa isikhathi sokumisa ukhonkolo.

Isetshenziswe ku:

• Isimo sezulu esishisayo

• Amanzi amakhulu

• Amafomu ayinkimbinkimbi

Izibonelo:

• Oshukela

• Ama-Phosphonates

• I-Hydroxycarboxylic acid

Izinzuzo:

• Ivimbela amalunga abandayo

• Ithuthukisa ukuqedwa

• Ivumela ukuhamba okunwetshiwe

3. Ukusheshisa Okuxubile

Umsebenzi: Sheshisa ukuthuthukiswa kwamandla kusenesikhathi.

Izibonelo:

• I-Calcium chloride (nakuba ukusetshenziswa okulinganiselwe ngenxa yengozi yokugqwala)

• I-calcium nitrate

• I-sodium thiocyanate

Isebenzisa:

• Ukubanda kwesimo sezulu

• Umsebenzi wokulungisa ngokushesha

• Ukukhiqiza ukhonkolo we-Precast

Qaphela: Ama-accelerator angenayo i-chloride akhethwa kukhonkolo eqinisiwe ukuvimbela ukugqwala kwensimbi.

4. Ama-Superplasticizers

Incazelo: Izinciphisi zamanzi ezisezingeni eliphezulu ezihlinzeka ngokuncishiswa kwamanzi okuphawulekayo ngaphandle kokulahlekelwa ukusebenza.

Izinhlanganisela:

• I-Polycarboxylate ethers

• Izingxube ezisekelwe ku-melamine

Izinhlelo zokusebenza:

• Ukhonkolo oqinile

• Ukhonkolo ozihlanganisayo (SCC)

• Ukhonkolo opompowe

Izinzuzo:

• Ukwanda kwe-fluidity ngaphandle kokuhlukaniswa

• Ukuqedwa kwendawo okuthuthukisiwe

• Ukhonkolo ominyene futhi ohlala njalo

5. I-Air-Entraining Admixtures

Inhloso: Yethula amabhamuza omoya amancane abe ukhonkolo.

Umsebenzi:

• Thuthukisa ukumelana neqhwa

• Thuthukisa ukusebenza

• Yehlisa ukopha nokuhlukaniswa

Izinhlelo zokusebenza:

• Ama-Pavements

• Izitezi zebhuloho

• Ukhonkolo obala ezindaweni ezibandayo

Ama-ejenti asetshenzisiwe:

• I-Vinsol resin

• Amafutha acid

• I-sulfonated hydrocarbons

6. Ama-Corrosion Inhibitors

Umsebenzi: Vikela ukuqiniswa kwensimbi ekugqwaleni.

Izinhlobo Ezivamile:

• I-calcium nitrite

• I-Zinc-based inhibitors

• I-Organic corrosion inhibitors

Izinhlelo zokusebenza:

• Izakhiwo zasolwandle

• Amabhuloho wemigwaqo emikhulu

• Amagaraji okupaka

7. Izixube Zokunciphisa Ukuncipha (ama-SRA)

Umsebenzi: Yehlisa ukushwabana okomisa nokuqhekeka okuhambisanayo.

Indlela: Ukungezwani okuphansi kwamanzi kuma-capillaries.

Izinhlelo zokusebenza:

• Ama-Slabs ebangeni

• Ama-Toppings

• Amalungu esakhiwo abhekene nezimo zokomisa

8. Ama-Alkali-Silica Reaction (ASR) Inhibitors

Inhloso: Nciphisa ukunwetshwa okubangelwa ukusabela phakathi kwama-alkali kusimende ne-silica esebenzayo ngamaqoqo.

Izingxube:

• I-Lithium nitrate

• Izinto ze-Pozzolanic ezibopha ama-alkali

I-Mineral Admixtures (SCMs)

1. Fly Umlotha

Umsuka: Umkhiqizo wokushiswa kwamalahle ezikhungweni zikagesi.

Amakilasi:

• Isigaba F: I-calcium ephansi

• I-Class C: I-calcium ephezulu

Izinzuzo:

• Ithuthukisa ukusebenza

• Ithuthukisa ukuqina

• Yehlisa ukushisa kwe-hydration

2. I-Silica Fume

Umthombo: Ngomkhiqizo we-silicon metal noma ukukhiqizwa kwe-ferrosilicon alloy.

Izakhiwo:

• Kuhle kakhulu (100x kancanyana kunosimende)

• Umsebenzi we-pozzolanic ophezulu

Isebenzisa:

• Ukhonkolo oqinile

• Izitezi zebhuloho

• Izakhiwo zasolwandle

3. I-Ground Granulated Blast Furnace Slag (GGBFS)

Umsuka: Umkhiqizo wokwenziwa kwensimbi.

Izinzuzo:

• Ukumelana ne-sulfate ephezulu

• Ithuthukisa amandla esikhathi eside

• Ikhanyisa umbala okhonkolo (uwusizo ezinhlelweni zezakhiwo)

4. I-Metakaolin

Ikhiqizwe ngu: Ukubala ubumba lwe-kaolin.

Izinzuzo:

• Ukusabela okuphezulu

• Ithuthukisa amandla nokuqeda

• Yehlisa i-efflorescence

5. Umlotha we-Rice Husk

Umthombo: Udoti wezolimo

Sebenzisa:

• Ukhonkolo eco-friendly

• Ithuthukisa ukungathobeki

• Yehlisa ukopha

Izindlela Zokwenza

1. Ukusabela kwe-Pozzolanic: I-silica ekuxubeni kwamaminerali ihlangana ne-calcium hydroxide ukuze yakhe i-CSH eyengeziwe (i-calcium silicate hydrate), isakhi esiyinhloko esinikeza amandla.

2. Ukuhlakazwa Kwezinhlayiya Zesimende: Ama-Superplasticizers anciphisa i-flocculation, andisa indawo engaphezulu kanye ne-hydration.

3. Amaphakethe Omoya Afakiwe: Dala ama-micro-chamber abamba ukucindezela kokunwetshwa emanzini aqandayo.

4. Ukuphazamiseka Kwamakhemikhali: Ezinye izingxube ziphazamisa noma zisheshise ukusabela kwe-hydration ukuze kushintshwe ukuziphatha kwesilungiselelo.

Izinzuzo Zokusebenzisa Izingxube

• Kuthuthukisiweukusebenza

• Okungconoukuqinafuthiukumelanaezindaweni ezinzima

• Yehlisiweisilinganiso samanzi nosimende(ithuthukisa amandla)

• Ukulawula isikhathi(ukusetha nokuqinisa)

• Ukusebenza kahle kwezindleko ngokusebenzisaukuncishiswa kukasimende

• Ezinye izindlela ezihambisana nemvelo (ukwakhiwa okusimeme)

Izinselelo Nemikhawulo

• Izinkinga zokuhambisanaphakathi kwezixube nosimende

• Izingozi zokweqisa izidakamizwa(inganciphisa amandla noma ibangele ukubambezeleka kokusetha)

• Izindleko, ikakhulukazi ngezingxube ezithuthukisiwe

• Ukukhathazeka ngemvelonezinye izinhlanganisela zokwenziwa

• Ikhwalithi yokulawulakanye nesidingo sokuklama okuxubile okufanele

Izicelo Ezisebenzayo

1. Amaphrojekthi Wengqalasizinda

• Amadamu, amahubhu, imigwaqo emikhulu, kanye nemigwaqo yezindiza zezindiza zisebenzisa izingxube ukuze ziqine, zilawule ukuqhekeka, nempilo ende yesevisi.

2. Izakhiwo Eziphakeme

• Ama-Superplasticizers kanye ne-retarders kusiza ukubekwa kokhonkolo ezindaweni eziphakeme kakhulu futhi kunciphise amalunga abandayo.

3. Izakhiwo Zasolwandle Nasogwini

• Ama-Corrosion inhibitors nama-ejenti afaka umoya-mpilo asiza ukulwa nezindawo ezinolaka ezigcwele i-chloride.

4. Precast Concrete

• Ama-accelerator nezinciphisi zamanzi zisheshisa umjikelezo wokukhiqiza futhi zithuthukise ikhwalithi yendawo.

5. Ukuthulula Kokhonkolo Okuningi

• Ama-retarders kanye ne-mineral admixtures anciphisa ama-gradients ashisayo kanye nokuqhekeka okubangelwa ukuncipha.

Ukusimama kanye Nokwakha Okuluhlaza

Izingxube zikakhonkolo zifaka isandla kakhuluukwakhiwa okusimeme:

• Nciphisaukusetshenziswa usimende, ukwehlisa ukukhishwa kwekhabhoni.

• Thuthukisaubude bempilo, kunciphisa isidingo sokulungisa.

• Vumela ukusetshenziswa kweimikhiqizo etholakala ezimbonini(isb., fly ash, slag).

• Ukusekela ukuthuthukiswa kweukhonkolo ophansi wekhabhoni.

I-Admixtures ihambisana nezitifiketi zesakhiwo esiluhlaza njengeI-LEEDfuthiPHUMULA.

Amathrendi Azayo Nezinto Ezintsha

1. Izixube zokuziphilisa

• Faka ama-microcapsules noma amagciwane asabela ekuqhekekeni futhi akuvale ngokuzenzakalelayo.

2. I-Nano-Admixtures

• Sebenzisa ama-nanoparticles afana ne-nano-silica ukuze uthuthukise i-microstructure kanye nezakhiwo zemishini.

3. I-Smart Admixtures

• Izinzwa ezishumekwe ngaphakathi kwezixube ezingabika idatha yesikhathi sangempela mayelana nengcindezi, ubunzima, nezinga lokushisa.

4. Ukhonkolo Wokuphrinta we-3D

• Idinga izingxube ezigeleza kakhulu nezisethwa ngokushesha ukuze kufakwe izingqimba ezinembayo.

5. Izixube Ezithatha Ikhabhoni

• Intuthuko iyaqhubeka ukuze kubanjwe i-CO₂ ngaphakathi kwekhonkrithi ngesikhathi sokwelapha, ukunciphisa ukukhishwa kwekhabhoni.

Izixube zikakhonkolozenze izinguquko zokwakha zesimanje ngokuvumela ukukhiqizwa kukakhonkolo oqinile, ohlala isikhathi eside, futhi osimeme. Kusukela ekuthuthukisweni okuyisisekelo kokusebenza kuye emandleni okuzilapha athuthukile, izixube zenza ukhonkolo ukuze kuhlangatshezwane nezidingo ezithile zesakhiwo nezemvelo. Njengoba ukufudukela kwabantu emadolobheni kukhula futhi nekhwelo lengqalasizinda esimeme likhula kakhulu, indima yezixube ekudaleni ukhonkolo osebenza kahle kakhulu, ovumela imvelo izoba bucayi kakhulu.

Onjiniyela, abadwebi bezakhiwo, kanye nezingcweti zokwakha kufanele bahlale behambisana nobuchwepheshe be-admixture, bakhethe futhi basebenzise lezi zinto zokwakha ngokuhlakanipha ukuze bavule amandla aphelele kakhonkolo ekhulwini lama-21.