Nja admixture jẹ kemikali nkan na ti o ti wa ni afikun ninu awọn ilana ti dapọ nja, iṣiro fun kere ju 5% ti simenti, ati ki o le significantly mu awọn iṣẹ ti nja.Awọn abuda kan ti awọn admixtures nja ni ọpọlọpọ awọn oriṣiriṣi ati iwọn lilo kekere, eyiti o ni ipa nla lori iṣẹ ti nja, ti o ni awọn abuda ti idoko-owo ti o kere si, ipa iyara, ati awọn anfani imọ-ẹrọ pataki ati eto-ọrọ aje.Pẹlu ilọsiwaju ti imọ-jinlẹ ati imọ-ẹrọ ti nlọsiwaju, awọn ohun elo ti a ti lo siwaju ati siwaju sii, ati awọn admixtures ti di paati pataki karun ti nja ni afikun si awọn paati ipilẹ mẹrin.

Admixtures le mu awọn egboogi-carbonation iṣẹ ti nja si kan awọn iye.Ibasepo laini kan wa laarin ijinle carbonation ati porosity ti nja.Admixtures ni ipa nla lori resistance Frost ti nja.O ni iṣẹ ṣiṣe to dara, ṣugbọn afikun ẹyọkan ti oluranlowo agbara ni kutukutu ko ni ipa lori resistance Frost ti nja.

Da lori iṣẹ admixtures nja, o le pin bi atẹle:
1) Kemikali admixtures lati mu awọn rheological-ini ti nja apapo.Pẹlu ọpọlọpọ awọn aṣoju idinku omi, awọn aṣoju afẹfẹ afẹfẹ ati awọn aṣoju fifa, ati bẹbẹ lọ.
(2) Awọn admixtures kemikali ti o ṣatunṣe akoko eto ati awọn ohun-ini lile ti nja.Pẹlu awọn retarders, awọn aṣoju agbara kutukutu ati awọn accelerators.
(3) Kemikali admixtures lati mu awọn agbara ti nja.Pẹlu oluranlọwọ afẹfẹ, oluranlowo antifreeze, oluranlowo mabomire ati inhibitor ipata, ati bẹbẹ lọ.
(4) Kemikali admixtures lati mu awọn miiran-ini ti nja.Pẹlu awọn aṣoju ti n ṣe afẹfẹ afẹfẹ, awọn aṣoju ti o gbooro, awọn aṣoju awọ, ati bẹbẹ lọ.

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