Where do you get the idea that kolasis means correction? Here is the definition from Bauer, Danker, Arndt, Gingrich Greek lexicon. Note the definitions, no correction anywhere. See the blue highlights, those are the historical sources the scholars reviewed to determine the correct meaning. Contrary to the popular internet rumor scholars don't sit around making up meanings for words.
κόλασις, εως, ἡ (s. prec. three entries; ‘punishment, chastisement’ so Hippocr.+; Diod S 1, 77, 9; 4, 44, 3; Aelian, VH 7, 15; SIG2 680, 13; LXX; TestAbr, Test12Patr, ApcEsdr, ApcSed; AscIs 3:13; Philo, Leg. ad Gai. 7, Mos. 1, 96; Jos., Ant. 17, 164; SibOr 5, 388; Ar. [Milne 76, 43]; Just.)
① infliction of suffering or pain in chastisement, punishment so lit. κ. ὑπομένειν undergo punishment Ox 840, 6; δειναὶ κ. (4 Macc 8:9) MPol 2:4; ἡ ἐπίμονος κ. long-continued torture ibid. Of the martyrdom of Jesus (Orig., C. Cels. 1, 48, 95; 8, 43, 12) PtK 4 p. 15, 34. The smelling of the odor arising fr. sacrifices by polytheists ironically described as punishment, injury (s. κολάζω) Dg 2:9.
② transcendent retribution, punishment (ApcSed 4:1 κόλασις καὶ πῦρ ἐστιν ἡ παίδευσίς σου.—Diod S 3, 61, 5; 16, 61, 1; Epict. 3, 11, 1; Dio Chrys. 80 [30], 12; 2 Macc 4:38 al. in LXX; Philo, Spec. Leg. 1, 55; 2, 196; Jos., Ant. 1, 60 al.; Just.; Did., Gen., 115, 28; 158, 10) ApcPt 17:32; w. αἰκισμός 1 Cl 11:1. Of eternal punishment (w. θάνατος) Dg 9:2 (Diod S 8, 15, 1 κ. ἀθάνατος). Of hell: τόπος κολάσεως ApcPt 6:21 (Simplicius in Epict. p. 13, 1 εἰς ἐκεῖνον τὸν τόπον αἱ κολάσεως δεόμεναι ψυχαὶ καταπέμπονται); ἐν τῇ κ. ἐκείνῃ 10:25; ibid. ἐφορῶσαι τὴν κ. ἐκείνων (cp. ApcEsdr 5:10 p. 30, 2 Tdf. ἐν τῇ κ.). ἐκ τῆς κ. ApcPt Rainer (cp. ἐκ τὴν κ. ApcSed 8:12a; εἰς τὴν κ. 12b and TestAbr B 11 p. 116, 10 [Stone p. 80]). ἀπέρχεσθαι εἰς κ. αἰώνιον go away into eternal punishment Mt 25:46 (οἱ τῆς κ. ἄξιοι ἀπελεύσονται εἰς αὐτήν Iren. 2, 33, 5 [Harv. I 380, 8]; κ. αἰώνιον as TestAbr A 11 p. 90, 7f [Stone p. 28]; TestReub 5:5; TestGad 7:5; Just., A I, 8, 4; D. 117, 3; Celsus 8, 48; pl. Theoph. Ant. 1, 14 [p. 90, 13]). ῥύεσθαι ἐκ τῆς αἰωνίου κ. rescue fr. eternal punishment 2 Cl 6:7. τὴν αἰώνιον κ. ἐξαγοράζεσθαι buy one’s freedom fr. eternal pun. MPol 2:3 v.l. κακαὶ κ. τοῦ διαβόλου IRo 5:3. κ. τινος punishment for someth. (Ezk 14:3, 7; 18:30; Philo, Fuga 65 ἁμαρτημάτων κ.) ἔχειν κόλασίν τινα τῆς πονηρίας αὐτοῦ Hs 9, 18, 1. ἀναπαύστως ἕξουσιν τὴν κ. they will suffer unending punishment ApcPt Bodl. 9–12. ὁ φόβος κόλασιν ἔχει fear has to do with punishment 1J 4:18 (cp. Philo, In Flacc. 96 φόβος κολάσεως).—M-M. TW.
Arndt, W., Danker, F. W., & Bauer, W. (2000). A Greek-English lexicon of the New Testament and other early Christian literature (3rd ed., p. 555). Chicago: University of Chicago Press.