Ukumelana nokuqhekeka I-concrete face slab ibaluleke kakhulu empilweni yenkonzo ye-concrete faced rockfill dam (CFRD). Imiphumela ye- umlotha wempukaneI-ejenti enwebekayo ye-MgO, kanye ne-shrinkage-reducing admixture (SRA) ezimpahleni zemishini, ukomisa ukushwabana kanye nokumelana nokuqhekeka kwekhonkrithi ye-face slab kuyafundwa futhi kuqhathaniswa nekhonkrithi ebhekiselwe kuyo. Imiphumela ikhombisa ukuthi ukungezwa komlotha ophaphayo ongu-20% (ngesisindo se-binder) kuthuthukisa amandla ekhonkrithi lapho umuntu esekhulile. Ngokuphambene nalokho, ukungezwa kwe-ejenti enwebekayo engu-6%MgO noma i-1%SRA kunciphisa amandla okucindezela, kuhlukanise amandla okudonsa kanye nokudonsa okuphelele kuya ngamazinga athile eminyakeni ehlukene. Ukufakwa kwe-20%fly ash, 6%MgO expansion agent, kanye ne-1%SRA kunganciphisa ukushwabana okomile eminyakeni ehlukahlukene futhi kuthuthukise ukumelana kokuqala kokuqhekeka kwekhonkrithi, kuyilapho ukufakwa kwe-6%MgO expansion agent kusiza kakhulu ekuvimbeleni ukuthuthukiswa kokushwabana nokuthuthukisa ukumelana nokuqhekeka kwekhonkrithi kunokufakwa kwe-20%fly ash noma i-1%SRA.
Idamu lokuzalisa amatshe elinokufakwa kwamatshe njenge-power eyinhloko kanye nobuso bekhonkrithi obuphezulu njengomzimba oyinhloko ongangeni amanzi. Ngenxa yezici zalo zokuphepha okuhle, ukuzivumelanisa nezimo okuqinile, isikhathi esifushane sokwakha kanye nezindleko eziphansi, amadamu okuzalisa amatshe elinobuso bekhonkrithi abe ngenye yezinhlobo zamadamu ezisetshenziswa kakhulu ekwakhiweni kwamadamu. Ama-slab ekhonkrithi ayizakhiwo ezijwayelekile ezincane nezifana nemigqa ezivame ukuqhekeka ngenxa yokushintsha kwezinga lokushisa, ukuguquguquka kwevolumu kanye nokumiswa kwesisekelo sedamu. Emzimbeni wedamu, uma kukhona ukuqhekeka ebusweni bekhonkrithi, kuzobhubhisa ubuqotho nokuqina kwesakhiwo somzimba wedamu, futhi igebe elibangelwa ukuqhekeka kwepuleti lobuso lingavumela amanzi angaphandle ukuthi angene kukhonkrithi, okubangela ngqo ukuvuza komzimba wedamu. Ngakho-ke, ukuthuthukisa ukumelana nokuqhekeka kwama-slab ekhonkrithi kuyindaba ebalulekile ehlobene nokusebenza okuphephile kwamadamu okuzalisa amatshe elinobuso bekhonkrithi. Umkhuba nocwaningo lwamanje lobunjiniyela lubonisa ukuthi izinyathelo zobuchwepheshe eziyinhloko zokuthuthukisa ukumelana nokuqhekeka kwekhonkrithi yobuso zifaka phakathi ukulawula ikhwalithi yezinto zokusetshenziswa zekhonkrithi, ukwenza ngcono isilinganiso sokuxuba ikhonkrithi, ukwengeza umlotha wempukane kanye nokwengeza inani elifanele lemicu. Izingxenye eziyinhloko ze-concrete shrinkage reducer uhlobo lwe-polyalcohol noma i-polyether organic compounds kanye nezinto eziphuma kuzo. Izifundo zibonise ukuthi ukwengeza i-shrinkage reducing agent kunganciphisa ukucindezeleka kobuso bamanzi e-concrete pore, ngaleyo ndlela kuncishiswe ukucindezeleka kokuncipha okubangelwa lapho ama-capillary pores elahlekelwa amanzi, futhi kuthuthukiswe ukumelana nokuqhekeka kwekhonkrithi ngezinga elithile. Ukwengezwa kwe-MgO expansion agent ngesikhathi sokulungiselela ikhonkrithi kuyindlela evamile yokulawula imifantu. Njengoba i-MgO expansion agent izokhiqiza ukwanda kwevolumu ethile ngesikhathi sokusetha ikhonkrithi kanye nenqubo yokuqina, ingabuyisela ukuqhekeka kwekhonkrithi, kufaka phakathi ukuqhekeka kwezinga lokushisa, ukuqhekeka kokomisa kanye nokuzishwabanisa, ngaleyo ndlela kuncishiswe ukuqhekeka kwekhonkrithi. Njengamanje, i-MgO expansion agent isetshenziswe ngempumelelo kukhonkrithi enkulu yesiteshi sikagesi wamanzi futhi yathola umphumela omuhle wokulwa nokuqhekeka. Kodwa-ke, zimbalwa izifundo eziphathelene nomphumela wesinciphisi sokuncishiswa kanye ne-ejenti yokwandisa i-MgO ekumelaneni nokuqhekeka kwekhonkrithi yobuso.
Isikhathi sokuthunyelwe: Mashi-09-2022