Induction Dumama Ferroconcrete Na'ura mai Ragewa
Hanyar dumama ƙarar mita mai girma ta dogara ne akan ƙa'idar cewa simintin da ke kewaye da rebar ya zama
m kamar yadda zafi da aka haifar daga rebar surface aka watsa zuwa kankare. A cikin wannan hanya, dumama yana faruwa
a cikin siminti ba tare da hulɗar kai tsaye tare da abu mai zafi ba, watau rebar na ciki. Kamar yadda aka nuna a hoto na 3, shi ne
mai yuwuwa a cikin sauri zafi rebar na ciki a cikin ferroconcrete saboda yawan makamashi ya fi girma a wannan hanyar idan aka kwatanta da dumama ohmic da hanyoyin dumama microwave dangane da konewa.
A cikin kankare, sinadarin calcium silicate hydrate (CSH) gel yana lissafin 60-70% na siminti hydrate, da Ca (OH)2 kashi 20-30%. A al'ada, ruwan kyauta a cikin tube na capillary yana ƙafe a kusan 100 ° C, kuma gel ɗin ya rushe a matsayin kashi na farko na rashin ruwa a 180 ° C. Ka (OH)2 yana rubewa a 450-550C, kuma CSH yana rubewa sama da 700°C. Tun da kankare matrix ne Multi-pore tsarin hada da ciminti hydrate da sha ruwa da kuma hada da capillary tube ruwa, gel ruwa da kuma free ruwa da composes, kankare dehydrates a cikin wani high zafin jiki yanayi, sakamakon pore tsarin canje-canje da sinadaran canje-canje. Waɗannan kuma suna yin tasiri ga halayen siminti, wanda ya dogara da nau'ikan siminti, cakuɗewa, da jimillar da ake amfani da su. Ƙarfin da aka matse na kankare yana ƙoƙarin raguwa sosai sama da 500C ko da yake bai nuna wani abu ba
ya canza zuwa 200°C [9, 10].
A zafi conductivity na kankare bambanta bisa ga cakuda kudi, yawa, yanayi na aggregates, danshi jihar da kuma irin siminti. Gabaɗaya, an san cewa zafin zafi na siminti shine 2.5-3.0 kcal / mh ° C, kuma zafin zafi a babban zafin jiki yana ƙoƙarin ragewa yayin da zafin jiki ya ƙaru. Harmathy ya ruwaito cewa danshi ya kara yawan zafin siminti a kasa da 100℃ [11], amma Schneider ya ba da rahoton cewa yawanci zafin zafin jiki yana raguwa a hankali a duk yanayin zafi yayin da zafin ciki na kankare ya karu [9]….
Induction Dumama Ferroconcrete Dismantling
