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 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.
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