Iziphumo zeFly Ash, i-MgO Expansive Agent kunye ne-Shrinkage-reducing Addiction kwi-Crack Resistance ye-Face Slab Concrete

Ukumelana nokuqhekeka I-concrete face slab ibaluleke kakhulu kwixesha lokusebenza kwedama le-concrete faced rockfill (CFRD). Iziphumo ze uthuthu lwempukaneI-MgO expansion agent, kunye ne-shrinkage-reducing admixture (SRA) kwiimpawu zoomatshini, ukomisa ukomisa kunye nokumelana nokuqhekeka kwekhonkrithi yeslab yobuso ziyafundwa kwaye zithelekiswa nekhonkrithi esetyenzisiweyo. Iziphumo zibonisa ukuba ukongezwa kwe-20% fly ash (ngokobunzima be-binder) kuphucula amandla ekhonkrithi xa umntu esemdala. Ngokwahlukileyo koko, ukongezwa kwe-6% MgO expansion agent okanye i-1% SRA kunciphisa amandla okucinezelwa, kwahlukanisa amandla okuxinana kunye nokuxinana kokugqibela ukuya kumaqondo athile kwiminyaka eyahlukeneyo. Ukufakwa kwe-20% fly ash, 6% MgO expansion agent, kunye ne-1% SRA kunokunciphisa ukuxinana okomileyo kwiminyaka eyahlukeneyo kwaye kuphucule ukumelana nokuqhekeka kwangoko kwekhonkrithi, ngelixa ukufakwa kwe-6% MgO expansion agent kunceda ngakumbi ekuthinteleni uphuhliso lokuxinana kunye nokuphucula ukumelana nokuqhekeka kwekhonkrithi kunokongezwa kwe-20% fly ash okanye i-1% SRA.

Idama leConcrete face rockfill (CFRD) lidama le-rockfill eline-rockfill njengamandla aphambili kunye nobuso bekhonkrithi obuphezulu njengomzimba oyintloko ongangeniyo amanzi. Ngenxa yeempawu zalo zokhuseleko oluhle, ukuziqhelanisa okuqinileyo, ixesha elifutshane lokwakha kunye neendleko eziphantsi, amadama e-concrete face rockfill abe yenye yezona ntlobo zamadama ezisetyenziswa kakhulu kuyilo lwedama. Ii-concrete slabs zizakhiwo ezibhityileyo nezifana nemicu eziqhele ukuqhekeka ngenxa yotshintsho lobushushu, ukuguquguquka komthamo kunye nokumiswa kwesiseko sedama. Kumzimba wedama, ukuba kukho ukuqhekeka ebusweni bekhonkrithi, kuya kutshabalalisa ukuthembeka kunye nokuqina kwesakhiwo somzimba wedama, kwaye umsantsa obangelwa kukuqhekeka kwepleyiti yobuso unokuvumela amanzi angaphandle ukuba angene kwikhonkrithi, nto leyo ebangela ngokuthe ngqo ukuvuza komzimba wedama. Ke ngoko, ukuphucula ukumelana nokuqhekeka kwee-concrete face slabs yingxaki ebalulekileyo enxulumene nokusebenza ngokukhuselekileyo kwamadama e-concrete face rockfill. Ubuchule bobunjineli kunye nophando lwangoku lubonisa ukuba amanyathelo obuchwephesha aphambili okuphucula ukumelana nokuqhekeka kwekhonkrithi yobuso aquka ukulawula umgangatho wezinto eziluhlaza zekhonkrithi, ukuphucula umlinganiselo womxube wekhonkrithi, ukongeza uthuthu oluphaphazelayo kunye nokongeza ubungakanani obufanelekileyo beefayibha. Izinto eziphambili ze-concrete shrinkage reducer luhlobo lwe-polyalcohol okanye i-polyether organic compounds kunye ne-derivatives yazo. Izifundo zibonise ukuba ukongezwa kwe-shrinkage reduction agent kunokunciphisa uxinzelelo lomphezulu wamanzi e-concrete pore, ngaloo ndlela kunciphisa uxinzelelo lokuqhekeka oluveliswa xa ii-capillary pores zilahlekelwa ngamanzi, kunye nokuphucula ukumelana nokuqhekeka kwekhonkrithi ukuya kwinqanaba elithile. Ukongezwa kwe-MgO expansion agent ngexesha lokulungiselela ikhonkrithi yindlela eqhelekileyo yokulawula ukuqhekeka. Ekubeni i-MgO expansion agent iya kuvelisa ukwanda komthamo othile ngexesha lokuseta ikhonkrithi kunye nenkqubo yokuqina, inokubuyisela ukuqhekeka kwekhonkrithi, kubandakanya ukuqhekeka kobushushu, ukuqhekeka kokomisa kunye nokuqhekeka ngokwakho, ngaloo ndlela kunciphisa ukuqhekeka kwekhonkrithi. Okwangoku, i-MgO expansion agent isetyenziswe ngempumelelo kwikhonkrithi enkulu yesikhululo samandla e-hydropower kwaye ifumene isiphumo esihle sokulwa nokuqhekeka. Nangona kunjalo, zimbalwa izifundo ezifunyenweyo malunga nefuthe le-shrinkage reducer kunye ne-MgO expansion agent ekuchaseni iintanda zekhonkrithi yobuso.