Nnipa esɔn a wɔreyɛ concrete ho adwuma. Ahwea gu fam a wɔdze refrafra. Efir a wɔdze mix concrete nso si hɔ a nnipa kor gyina hɔ a ɔrekyinkyim. Cement nkotoku nso gu hɔ, na kor kita dadze a ɔde repia ndɛte no egu ne kyɛnse mu.