Palinso mitundu yambiri ya makina a njerwa pamsika, pakati pawo pali makina a njerwa otchedwa konkire block machine. Koma kodi mukudziwa zozindikiritsa makina oyika njerwa? Kodi mukudziwa zomwe zilembo za nambala ya njerwa zimayimira?
Mipiringidzo ya konkriti imagwiritsidwa ntchito makamaka kudzaza mawonekedwe apamwamba a nyumbayo, chifukwa cha kupepuka kwake, kutsekereza kwamawu, mphamvu yabwino yotchinjiriza, ogwiritsa ntchito ambiri amakhulupirira ndi kukondedwa. Zopangira zake ndi monga mvuvu: Simenti: simenti acts a