Ikhonkrithi yeyona nto iyilwe ngabantu. Ukuvela kwekhonkrithi kuqalise inguqu kwimbali yolwakhiwo lwabantu. Ukusetyenziswa kwemixube yekhonkrithi luphuculo olukhulu kwimveliso yekhonkrithi.
izityalo zenze imveliso yezinto zokwakha zahamba ngendlela yoshishino kunye nolondolozo. Oku kukwabeka phambili iimfuno ezingaphezulu kulawulo lomgangatho wemveliso yekhonkrithi, okukhokelela kuphuculo olupheleleyo lomgangatho wekhonkrithi kwiminyaka yakutshanje. Kwangaxeshanye, ngenxa yomgangatho ophantsi wobuchwephesha bolawulo lomgangatho kwezinye izityalo ezilungele ukuxutywa ngekhonkrithi, izise iingozi ezifihlakeleyo kumgangatho weprojekthi, kwaye yabonakala. Ingozi yobunjineli yobunjineli engazange ihlangane ngaphezu kweminyaka engama-20 ibangele ilahleko enkulu yezoqoqosho.
Izinto eziphambili ezibangela ukungahambelani phakathi kwe-admixtures kunye nesamente:
Ukusebenza kwekhonkrithi akuxhomekanga kuphela kumsebenzi wezinto ezidibeneyo, kodwa kunye nokulungelelaniswa phakathi kwezixhobo kunye nomlinganiselo womxube wekhonkrithi. I-Admixtures (izinciphisi zamanzi) azihambelani nesamente, oko kukuthi, i-admixtures ayiphuculi kakhulu ukusebenza kwesamente, ilahleko ye-slump yekhonkrithi inkulu kakhulu okanye ikhonkrithi ibeka ngokukhawuleza, kwaye kunye nokuqhekeka kunokwenzeka ukuba kwenzeke. kumalungu olwakhiwo olubambekayo.
Njengenxalenye yesihlanu yekhonkrithi, i-admixture ichaza inxalenye encinci, kodwa inempembelelo enkulu ekusebenzeni kwekhonkrithi, enokuthi iphucule kakhulu i-slump yekhonkrithi kwaye ilungelelanise ixesha lokudibanisa, ngaloo ndlela iphucula ukusebenza kokwakhiwa kwekhonkrithi okanye ukonga iindleko. . I-hydration reaction ye-cement idinga ngaphantsi kwe-25% yamanzi obunzima be-samente, kodwa xa i-samente idibana namanzi, iya kwenza isakhiwo se-flocculation ukusonga amanzi kuyo. Ukongezwa kwe-admixture i-adsorption ye-directional kwi-surface ye-cement particles, ukwenzela ukuba umphezulu we-cement particles ube nentlawulo efanayo, eyahlulwayo ngenxa yempembelelo yokunyathela, ngaloo ndlela ikhulula amanzi ahlanganiswe ngesakhiwo se-cement flocculation, ngoko. ukuba amanzi amaninzi anokubandakanyeka kwi-hydration reaction. , ukuphucula umsebenzi. Ubungakanani be-adsorption ye-cement particles kwi-admixture kunye nokulahlekelwa kwempembelelo ye-admixture ibonisa ukulungelelaniswa kwe-admixture kwi-samente.
Ingxaki yokungahambelani phakathi kwe-admixtures kunye ne-samente yingxaki ekhathazayo kunye neentloko kubo bonke abavelisi bekhonkrithi zorhwebo. Emva kokuba ingxaki yenzekile, ekugqibeleni ibekwa ityala kwi-admixture. Ukungahambelani phakathi kwe-admixture kunye ne-samente kubangelwa yi-admixture ngokwayo. Izinto ezisemgangathweni kunye nokwakhiwa kweekhemikhali, kodwa esona sizathu sihlala sinxulumene nezinto ezifana nesamente kunye ne-admixtures, nokuba yinto eqhelekileyo yokunciphisa amanzi, i-nylon-based superplasticizer okanye isizukulwana sesithathu se-polycarboxylic acid-based superplasticizer iya kuvela.
Ixesha lokuposa: Jul-19-2022
