Umhla wokuThumela:26,Feb,2024
Iimpawu zeRetarder:
Inokunciphisa izinga lokukhululwa kobushushu be-hydration yeemveliso zekhonkrithi zorhwebo.Njengoko sonke sisazi, uphuhliso lwamandla okuqala lwekhonkrithi yorhwebo lunxulumene ngokusondeleyo nokwenzeka kweentanda kwikhonkrithi yorhwebo.I-hydration yangaphambili ikhawuleza kakhulu kwaye iqondo lokushisa litshintsha ngokukhawuleza, elinokuthi libangele ngokulula iintanda kwikhonkrithi yorhwebo, ngokukodwa umthamo omkhulu wekhonkrithi yorhwebo.Ekubeni iqondo lokushisa langaphakathi lekhonkrithi yorhwebo liphakama kwaye kunzima ukulahla, umahluko omkhulu wobushushu phakathi kwangaphakathi nangaphandle uya kwenzeka, okuya kukhokelela ekubeni kubekho iintanda kwikhonkrithi yorhwebo, eya kuchaphazela kakhulu umgangatho wekhonkrithi yorhwebo.Ichaphazela umgangatho wekhonkrithi yezorhwebo.Iretader yekhonkrithi yorhwebo inokuphucula ngokusebenzayo le meko.Inokuthintela ukukhutshwa kobushushu bobushushu be-hydration, icothise isantya sokukhutshwa kobushushu kwaye inciphise incopho yobushushu, ithintele ngokufanelekileyo ukwenzeka kweentanda ekuqaleni kwekhonkrithi yorhwebo.
Inokunciphisa ilahleko ye-slump yekhonkrithi yorhwebo.Ukuziqhelanisa kubonise ukuba banokwandisa kakhulu ixesha lokuqala lokumisela ikhonkrithi yezorhwebo.Kwangaxeshanye, ikhefu lexesha phakathi kokumiselwa kokuqala kunye nokusetwa kokugqibela kwekhonkrithi yorhwebo nalo lifutshane, elinganciphisi nje ilahleko yokuthotywa kwekhonkrithi, kodwa ayichaphazeli amandla okuqala ekhonkrithi yorhwebo.Nyusa.Inexabiso elifanelekileyo elisebenzayo kwaye isetyenziswa ngakumbi kulwakhiwo lwekhonkrithi yorhwebo.
Impembelelo kumandla.Ukususela kumbono wophuhliso lwamandla, amandla okuqala ekhonkrithi yentengiso exutywe kunye ne-retarder iphantsi kunekhonkrithi engaxutywanga, ngakumbi i-1d kunye ne-3d yamandla.Kodwa ngokubanzi emva kweentsuku ezi-7, ezi zimbini ziya kuhamba ngokuthe ngcembe, kwaye inani le-retarder elongeziweyo liya kunyuka kancinci.
Ukongeza, njengoko inani le-coagulant ebandakanyiweyo kumqadi linyuka, amandla okuqala ayancipha ngakumbi kwaye ukuphuculwa kwamandla kuthatha ixesha elide.Nangona kunjalo, ukuba ikhonkrithi yorhwebo ixutywe kakhulu kwaye ixesha lokumisela ikhonkrithi yezorhwebo lide kakhulu, ukuphuphuma kwamanzi kunye nokulahlekelwa kwamanzi kuya kubangela iziphumo ezisisigxina kunye nezingenakuhlawuleka kumandla ekhonkrithi yezorhwebo.
Ukukhethwa kwe-retarder:
① Ikhonkrithi yorhwebo kunye nomthamo omkhulu wekhonkrithi yentengiso egalelwa ngokuqhubekayo kumaqondo obushushu aphezulu kufuneka igalelwe ngokwemigangatho ngenxa yokuphazamiseka kokugalelwa kanye okanye amacandelwana ashinyeneyo.Ukuqinisekisa ukuba iileyile eziphezulu kunye nezantsi zidibene kakuhle ngaphambi kokusekwa kokuqala, ikhonkrithi yorhwebo iyadingeka Inokuqala ixesha elide lokumisela kunye neempawu ezintle zokubuyisela.
Ukongezelela, ukuba ukushisa kwe-hydration ngaphakathi kwekhonkrithi yorhwebo akulawulwa kakuhle, ukuqhekeka kweqondo lokushisa kuya kubonakala, okuya kunciphisa ukunyuka kweqondo lokushisa.Iiarhente zokunciphisa amanzi ezisetyenziswa ngokuqhelekileyo, iiretardants, kunye ne-retading agents zokunciphisa amanzi, njenge-citric acid.
② Amandla aphezulu ekhonkrithi yentengiso ngokubanzi inesantya esisezantsi ngokwentelekiso yesanti kunye nomlinganiselo ophantsi wesamente wamanzi.I-aggregate erhabaxa inamandla amakhulu kunye nesixa esikhulu sesamente.Oku kufuna umlinganiselo ophezulu wesamente kunye nokusetyenziswa kwe-agent yokunciphisa amanzi ngobuchule obuphezulu.Ukongezelela, ii-agent zokunciphisa amanzi ezisebenza kakuhle nazo ziyafuneka.Inokuzisa iingenelo ezithile zoqoqosho.
Izinga lokunciphisa amanzi kwii-arhente zokunciphisa amanzi ngobuchule obuphezulu ngokuqhelekileyo yi-20% ukuya kwi-25%.Ezona arhente zixhaphakileyo zokunciphisa amanzi eTshayina ziNye series.Ii-agent zokunciphisa amanzi ezisebenza kakuhle ngokubanzi zonyusa ilahleko yokudilika, ngoko ke zihlala zisetyenziswa kunye ne-retarders ukuphucula ukusebenza komxube kunye nokunciphisa ukulahleka kolwelo ngokuhamba kwexesha.
③ Ukumpompa kufuna ikhonkrithi yorhwebo ukuba ibe ne-fluidity, ukungahluli, ukungopha, kunye neempawu eziphezulu zokudilika ezifunwa yinkqubo ngelixa uqinisekisa amandla.Ke ngoko, udidi lwayo oluhlanganisiweyo luphezulu kunolo lwekhonkrithi eqhelekileyo yorhwebo.Yiba ngqongqo.Kukho ezininzi ezikhoyo:
I-fly ash: Yehlisa ukushisa kwe-hydration kwaye iphucula ukuhambelana kwekhonkrithi yezorhwebo.
I-arhente yokunciphisa amanzi eqhelekileyo: njenge-agent ye-calcium yemithi yokunciphisa amanzi, enokugcina isamente, ikhulise ulwelo, ilibazise ukukhutshwa kobushushu be-hydration, kunye nokwandisa ixesha lokuqala lokumisela.
I-agent ye-Pumping: Luhlobo lwe-agent e-fluidizing enokuphucula kakhulu umbane wekhonkrithi yorhwebo, ukwandisa ixesha lokugcinwa kwamanzi, kunye nokunciphisa ilahleko ye-slump ngokuhamba kwexesha.Njengoko igama libonisa, ngumxube olungiselelwe ukumpompa.Ii-agent eziphezulu zokunciphisa amanzi kunye ne-air-entraining agents nazo zingasetyenziselwa kwikhonkrithi yorhwebo epompeweyo, kodwa ayisetyenziswanga ngokuqhelekileyo.
Ixesha lokuposa: Feb-26-2024