Concrete admixture wani sinadari ne wanda ake karawa a cikin aikin hada siminti, wanda bai kai kashi 5% na siminti ba, kuma yana iya inganta aikin siminti sosai.Halaye na kankare admixtures ne da yawa iri da kuma kananan sashi, wanda ke da babban tasiri a kan yi na kankare, kuma suna da halaye na kasa zuba jari, m sakamako, da kuma gagarumin fasaha da tattalin arziki amfanin.Tare da ci gaba da cigaban kimiyya da fasaha, an fi amfani da abubuwan taimako sosai, da kuma masu taimako sun zama babban mahimmancin mahimmancin kayan kwalliya fiye da kayan haɗin guda huɗu.

Admixtures na iya inganta aikin anti-carbonation na kankare zuwa wani matsayi.Akwai wata dangantaka ta madaidaiciya tsakanin zurfin carbonation da porosity na kankare.Admixtures suna da babban tasiri akan juriya na sanyi na kankare.Yana da kyau yi, amma guda Bugu da kari na farkon ƙarfin wakili ba shi da wani tasiri a kan sanyi juriya na kankare.

Dangane da aikin admixtures na kankare, ana iya raba shi kamar haka:
1) Chemical admixtures don inganta rheological Properties na kankare gaurayawan.Ciki har da nau'ikan rage ruwa daban-daban, na'urorin shigar da iska da masu yin famfo, da sauransu.
(2) Chemical admixtures cewa daidaita saitin lokaci da hardening Properties na kankare.Ciki har da retarders, farkon ƙarfi jamiái da accelerators.
(3) Abubuwan da ake amfani da su na sinadarai don inganta ƙarfin siminti.Ciki har da wakili mai hana iska, mai hana daskarewa, wakili mai hana ruwa da mai hana tsatsa, da sauransu.
(4) Chemical admixtures don inganta sauran kaddarorin na kankare.Ciki har da abubuwan da suka haɗa da iska, masu haɓakawa, masu canza launi, da sauransu.

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