Isikhathi sokusetha ikhonkrithi siyipharamitha ebalulekile ethinta ikhwalithi yokwakha kanye nenqubekela phambili. Uma isikhathi sokusetha side kakhulu, singase siholele ekuqhubekeni kancane kokwakhiwa futhi sonakalise ikhwalithi yokuqina kwekhonkrithi; uma isikhathi sokusetha sifushane kakhulu, singase siholele ebunzimeni ekwakhiweni kwekhonkrithi futhi sithinte umphumela wokwakhiwa kwephrojekthi. Ukuze kulungiswe isikhathi sokusetha ikhonkrithi, ukusetshenziswa kwezingxube sekuyindlela evamile ekukhiqizweni kwekhonkrithi yesimanje.I-Hydroxyethyl Methyl Cellulose (HEMC), njenge-derivative ejwayelekile ye-cellulose eguquliwe, isetshenziswa kabanzi ekuxubeni kwekhonkrithi futhi ingathinta i-rheology, ukugcinwa kwamanzi, isikhathi sokusetha kanye nezinye izakhiwo zekhonkrithi.1. Izakhiwo eziyisisekelo ze-HEMC
I-HEMC iyi-cellulose eguquliwe, evame ukwenziwa nge-cellulose yemvelo ngokusebenzisa ukusabela kwe-ethylation kanye ne-methylation. Inezakhiwo ezinhle zokuncibilika kwamanzi, ukuqina, ukugcinwa kwamanzi kanye ne-gelling, ngakho-ke isetshenziswa kabanzi ekwakheni, ekumbozeni, kumakhemikhali ansuku zonke nakwamanye amasimu. Ku-concrete, i-HEMC ivame ukusetshenziswa njenge-thickener, i-ejenti yokugcina amanzi kanye ne-rheology control agent, engathuthukisa ukusebenza kahle kwe-concrete, yandise ukunamathela futhi yandise isikhathi sokusetha.
2. Umphumela we-HEMC esikhathini sokusetha ukhonkolo
Ukulibazisa isikhathi sokusetha
Njenge-derivative ye-cellulose, i-HEMC iqukethe inani elikhulu lamaqembu athanda amanzi esakhiweni sayo sama-molecule, angasebenzisana nama-molecule amanzi ukuze akhe ama-hydrate azinzile, ngaleyo ndlela abambezele inqubo yokumunca usimende ngezinga elithile. Ukusabela kokumunca usimende kuyindlela eyinhloko yokuqina kokhonkolo, futhi ukungezwa kwe-HEMC kungathinta isikhathi sokubeka ngezindlela ezilandelayo:
Ukugcinwa kwamanzi okuthuthukisiwe: I-HEMC ingathuthukisa kakhulu ukugcinwa kwamanzi kwekhonkrithi, yehlise izinga lokuhwamuka kwamanzi, futhi yandise isikhathi sokusabela kokumanziswa kwekhonkrithi. Ngokugcinwa kwamanzi, i-HEMC ingagwema ukulahlekelwa amanzi ngokweqile, ngaleyo ndlela ibambezele ukwenzeka kokubekwa kokuqala nokokugcina.
Ukunciphisa ukushisa komswakama: I-HEMC ingavimbela ukusabela kokushayisana kanye nomswakama kwezinhlayiya zesimende ngokwandisa ukujiya kwekhonkrithi nokunciphisa ijubane lokuhamba kwezinhlayiya zesimende. Izinga eliphansi lomswakama lisiza ukubambezela isikhathi sokusetha ikhonkrithi.
Ukulungiswa kwe-Rheological: I-HEMC ingalungisa izakhiwo ze-rheological zekhonkrithi, yandise i-viscosity yayo, futhi igcine i-concrete paste isesimweni esihle ekuqaleni, igweme ubunzima bokwakha obubangelwa ukujiya ngokweqile.
Izinto ezithonyayo
Umphumela weI-HEMCNgesikhathi sokubeka akuhlobene nje kuphela nomthamo wayo, kodwa futhi kuthinteka ezinye izici zangaphandle:
Isisindo sama-molecule kanye nezinga lokushintsha i-HEMC: Isisindo sama-molecule kanye nezinga lokushintsha (izinga lokushintsha i-ethyl ne-methyl) ye-HEMC kunethonya elikhulu ekusebenzeni kwayo. I-HEMC enesisindo sama-molecule esiphezulu kanye nezinga eliphezulu lokushintsha ngokuvamile ingakha isakhiwo senethiwekhi esiqinile, ibonise ukugcinwa kwamanzi okungcono kanye nezakhiwo zokuqina, ngakho-ke umphumela wokulibaziseka esikhathini sokubeka ubaluleke kakhulu.
Uhlobo lwesimende: Izinhlobo ezahlukene zesimende zinamazinga ahlukene okumanzisa, ngakho-ke umphumela we-HEMC ezinhlelweni ezahlukene zesimende nawo uhlukile. Isimende esijwayelekile sasePortland sinezinga lokumanzisa elisheshayo, kuyilapho esinye isimende esishisa kancane noma isimende esikhethekile sinezinga lokumanzisa elihamba kancane, futhi indima ye-HEMC kulezi zinhlelo ingase ivelele kakhulu.
Izimo zemvelo: Izimo zemvelo ezifana nokushisa nomswakama zinethonya elibalulekile esikhathini sokusetha ukhonkolo. Amazinga okushisa aphezulu azosheshisa ukusabela kokumanzi kwesimende, okuholela esikhathini sokusetha esifushane, futhi umphumela we-HEMC ezindaweni zokushisa okuphezulu ungase ube buthaka. Ngokuphambene nalokho, ezindaweni zokushisa eziphansi, umphumela wokulibaziseka we-HEMC ungase ube sobala kakhulu.
Ukuhlushwa kwe-HEMC: Ukuhlushwa kwe-HEMC kunquma ngqo izinga lethonya layo kukhonkolo. Ukuhlushwa okuphezulu kwe-HEMC kungakhulisa kakhulu ukugcinwa kwamanzi kanye nokwakheka kwekhonkolo, ngaleyo ndlela kubambezele isikhathi sokusetha ngempumelelo, kodwa i-HEMC eyeqile ingabangela ukugeleza okubi kwekhonkolo futhi ithinte ukusebenza kokwakhiwa.
Umphumela we-HEMC ohambisanayo nezinye izingxube
I-HEMC ivame ukusetshenziswa nezinye izinto ezixubile (njengezinto ezinciphisa amanzi, izinto ezinciphisa ugesi, njll.) ukulungisa ngokuphelele ukusebenza kwekhonkrithi. Ngokubambisana nabahlaziyi, umphumela wokulibaziseka kokusethwa kwe-HEMC ungathuthukiswa kakhulu. Isibonelo, umphumela wokubambisana wezinto ezithile ezinciphisa ugesi njenge-phosphates kanye nezinto ezixubile ushukela ne-HEMC ungandisa kakhulu isikhathi sokusethwa kwekhonkrithi, esifanelekile kumaphrojekthi akhethekile ezindaweni ezishisayo noma esidinga isikhathi eside sokwakha.
3. Eminye imiphumela ye-HEMC ezimpahleni zekhonkrithi
Ngaphezu kokulibazisa isikhathi sokusetha, i-HEMC nayo inethonya elibalulekile kwezinye izakhiwo zekhonkrithi. Isibonelo, i-HEMC ingathuthukisa ukugeleza, ukulwa nokuhlukaniswa, ukusebenza kokupompa kanye nokuqina kwekhonkrithi. Ngenkathi ilungisa isikhathi sokusetha, imiphumela yokujiya kanye nokugcinwa kwamanzi ye-HEMC ingavimbela ngempumelelo ukuhlukaniswa noma ukuphuma kwegazi kwekhonkrithi, futhi ithuthukise ikhwalithi iyonke kanye nokuzinza kwekhonkrithi.
I-Hydroxyethyl methylcellulose (HEMC) ingalibazisa ngempumelelo isikhathi sokusetha ikhonkrithi ngokusebenzisa imiphumela yayo emihle yokugcina amanzi, ukuqina kanye nokulawula i-rheological. Izinga lethonya le-HEMC lithintwa yizici ezifana nesisindo sayo sama-molecule, izinga lokushintsha, uhlobo lwesimende, inhlanganisela yokuxuba kanye nezimo zemvelo. Ngokulawula ngokufanele umthamo kanye nesilinganiso se-HEMC, isikhathi sokusetha singandiswa ngempumelelo ngenkathi kuqinisekiswa ukusebenza kokwakhiwa kwekhonkrithi, kanye nokusebenza kahle kanye nokuqina kwekhonkrithi kungathuthukiswa. Kodwa-ke, ukusetshenziswa ngokweqile kwe-HEMC kungaletha nemiphumela emibi, njengokugeleza okungekuhle noma umswakama ongaphelele, ngakho-ke kudingeka isetshenziswe ngokuqapha ngokuya ngezidingo zangempela zobunjiniyela.
Isikhathi sokuthunyelwe: Novemba-21-2024