Ukuchasana nokuqhekekai-concrete face slab ibaluleke kakhulu kubomi benkonzo ye-concrete faced rockfill dam(CFRD).Iziphumo zebhabha uthuthu , i-agent ye-MgO yokwandisa, kunye ne-shrinkage-reducing admixture (SRA) kwiipropati ze-mechanical, i-shrinkage yokomisa kunye nokumelana nokuqhekeka kwekhonkrithi ye-slab yobuso kuyafundwa kwaye kuthelekiswa nekhonkrithi yereferensi.Iziphumo zibonisa ukuba ukongezwa kwe-20% fly ash (ngobunzima ye-binder) iphucula ukomelela kwekhonkrithi kwiminyaka kade. Ngokwahlukileyo, ukongezwa kwe-6% ye-MgO ye-ajenti yokwandisa okanye i-1% ye-SRA inciphisa amandla oxinzelelo, ukwahlula amandla e-tensile kunye ne-tensile yokugqibela ukuya kwiidigri ezithile kwii-ages ezahlukeneyo. I-%SRA inokunciphisa ukushwabana okomileyo kwiminyaka eyahluka-hlukeneyo kwaye iphucule ukuxhathisa kokuqhekeka kwangoko kwekhonkrithi, ngelixa ukufakwa kwe-6%MgO ye-ejenti yokwandisa inceda kakhulu ekuthinteleni uphuhliso lokushwabana nokuphucula ukuxhathisa kokuqhekeka kwekhonkrithi kunokongezwa kwe-20% fly. uthuthu okanye 1%SRA.
Idama leconcrete face rockfill (i-CFRD) lidama lokuzalisa ilitye eline-rockfill njengowona mandla aphambili kunye nobuso bekhonkrithi obuphezulu njengowona mzimba uphambili ochasene nokubona. Ngenxa yeempawu zayo zokhuseleko olulungileyo, ukuguquguquka okuqinileyo, ixesha elifutshane lokwakha kunye neendleko eziphantsi, amadama e-concrete face rockfill abe yenye yezona ntlobo zisetyenziswa kakhulu zamadama kuyilo lwamadama. Amacwecwe ekhonkrithi zizinto eziqhelekileyo ezibhityileyo nezifana nemicu ezithanda ukuqhekeka ngenxa yotshintsho lobushushu, ukuguqulwa komthamo kunye nokuhlaliswa kwesiseko sedama. Kumzimba wedama, ukuba kukho ukuqhekeka ebusweni bekhonkrithi, kuya kutshabalalisa ingqibelelo kunye nokuqina kwesakhiwo somzimba wedama, kwaye umsantsa obangelwa kukuqhekeka kwepleyiti yobuso unokuvumela amanzi angaphandle ukuba angene kwikhonkrithi; ebangela ngokuthe ngqo ukuvuza komzimba wedama. Ke ngoko, ukuphuculwa kokumelana nokuqhekeka kwe-concrete face slabs ngumba obalulekileyo onxulumene nokusebenza ngokukhuselekileyo kwamadama e-rockfill ebusweni. Uqheliselo lobunjineli lwangoku kunye nophando lubonisa ukuba amanyathelo obugcisa aphambili okuphucula ukuxhathisa kokuqhekeka kobuso bekhonkrithi kubandakanya ukulawula umgangatho wezinto eziphathekayo eziphathekayo, ukulungelelanisa umxube wekhonkrithi, ukongeza uthuthu lwempukane kunye nokongeza inani elifanelekileyo lemicu. i-shrinkage reducer luhlobo lwe-polyalcohol okanye i-polyether organic compounds kunye nezinto eziphuma kuzo. Uphononongo lubonise ukuba ukongezwa kwe-arhente yokunciphisa i-shrinkage kunokunciphisa ukuxinana komphezulu wamanzi e-concrete pore, ngaloo ndlela kuncitshiswe uxinzelelo lwe-shrinkage oluveliswa xa i-capillary pores ilahlekelwa ngamanzi, kunye nokuphucula ukuxhathisa kokuqhekeka kwekhonkrithi ukuya kwinqanaba elithile. Ukongezwa kwe-agent ye-MgO ngexesha lokulungiselela ikhonkrithi yindlela eqhelekileyo yokulawula ukuqhekeka. Ekubeni i-ejenti yokwandisa i-MgO iya kuvelisa ukwanda komthamo othile ngexesha lokumiswa kwekhonkrithi kunye nenkqubo yokuqina, inokuhlawulela i-concrete shrinkage, kubandakanywa nokunciphisa izinga lokushisa, ukomisa i-shrinkage kunye ne-self-shrinkage, ngaloo ndlela kuncitshiswe ukwenzeka kokuqhekeka kwekhonkrithi. Okwangoku, i-arhente yokwandisa i-MgO isetyenziswe ngempumelelo kwikhonkrithi enkulu yesikhululo sombane wamanzi kwaye iphumelele isiphumo esihle sokuchasana nokuqhekeka. Nangona kunjalo, kukho izifundo ezimbalwa malunga nesiphumo sokunciphisa i-shrinkage kunye ne-arhente yokwandisa i-MgO ekuxhathiseni ukuqhekeka kwekhonkrithi yobuso.
Ixesha lokuposa: Mar-09-2022