Yin simintin yashitsari ne na gargajiya amma kuma na zamani. Yana amfani da koren yashi (yashi mai danshi) ko busasshiyar yashi don samar da tsarin gyare-gyare. Koren yashi simintin gyare-gyare shine mafi dadewa tsarin yin simintin simintin gyare-gyaren da aka yi amfani da shi a tarihi. Lokacin yin gyare-gyaren, ya kamata a samar da tsarin da aka yi da itace ko karfe don samar da rami mara kyau. Karfe da aka narkar da shi sai a zuba a cikin rami don samar da simintin gyare-gyare bayan sanyaya da ƙarfafawa. Yashi simintin gyare-gyare ba shi da tsada fiye da sauran hanyoyin yin simintin gyare-gyare duka don haɓaka ƙirar ƙira da ɓangaren simintin ɓangarorin. Yin simintin yashi, ko da yaushe yana nufin simintin yashi koren (idan babu bayanin musamman). Koyaya, a zamanin yau, sauran hanyoyin yin simintin suma suna amfani da yashi don yin ƙirar. Suna da nasu sunayen, kamarharsashi mold simintin gyaran kafa, farin guduro mai rufi yashi simintin gyaran kafa (babu irin gasa),rasa kumfada vacuum simintin.