Concrete additives, wanda aka sani da admixtures ko pozzolanic materials, shine kayan sinadarai ko mineral wanda aka ƙara zuwa concrete mixture don canza sifatinsa da haɓaka aikinsa a aikace-aikacen musamman. Waɗannan kayan sun haɗa da madannin ruwa, madannin iska, accelerators, retarders, plasticizers, da kayan cementitious na biyu kamar silica fume da fly ash. Tsarin su ya ƙunshi daga sinadarai masu ɗanɗano na polymer zuwa minerals na asali, kowannensu an tsara shi don magance ƙalubale musamman a cikin sanya concrete, maganin goro, da ƙarfin dogon lokaci a cikin muhallin karkashin ƙasa mai ƙalubale.
Masu saurin siminti da masu jinkirta su ne kayan aiki na sinadarai waɗanda aka tsara don canza saurin damshin siminti na Portland, don haka samar da sarrafawa mai daɗin lokacin siminti da ci gaban ƙarfin farko. Masu saurin su ne abubuwa - yawanci suna ɗauke da calcium chloride, sodium nitrate, ko madadin non-chloride - waɗanda suke katalyze damshin siminti don rage lokacin farawa da na ƙarshe, don haka samar da ƙarfin sauri. Masu jinkirta, waɗanda aka tsara daga derivatives na tartaric acid, lignosulfonates, ko hydroxy carboxylic acids, suna ɗaga lokacin aiki da jinkirta damshin, don haka kiyaye siminti na plasticity lokacin da ake aikin saka siminti na dogon lokaci. Waɗannan kayan aiki na sinadarai sune muhimmin hanyoyin sarrafawa a aikin gini na kasa, inda yanayin kasa, muhallin busasshen, da shirye-shirye na gini galibi suna buƙatar saurin ko daɗin halayyar siminti a waje da lokacin damshin na yau da kullun.
Masu saurin siminti na plasticity su ne kayan aiki na sinadarai waɗanda ke canza sifofi na rheological da mechanical na siminti ta hanyar rage tension na ruwa da tasiri kan hanyoyin damshin siminti. A cikin aikin gini na kasa da na geotechnical, waɗannan abubuwa galibi sun ɗauke da polycarboxylic ether (PCE) based polymers, sulfonated naphthalene formaldehyde (SNF), ko derivatives na carboxylic acid waɗanda ke inganta aikin siminti ba tare da saurin karuwar kandako na ruwa ba. Tasirin plasticizing ya baiwa injiniyoyi damar riƙe ƙarancin kandako na ruwa zuwa siminti yayin da suke samun halaye na slump da flow da ake so, wanda shi ne muhimmin aikin gini na kasa inda hanyoyin saka siminti na al'ada suke da wahala ko ba zai yiwu ba.
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