Kulimba kwa mchenga wopangidwa ndi makina kumakhala koyipa pang'ono kuposa mchenga wamtsinje, koma kumafikabe pamlingo wabwino kwambiri wa GB/T 141684293 muyezo, ndipo palibe vuto pakugwiritsa ntchito konkriti wamba.Komabe, pogwiritsira ntchito mamembala a konkire nthawi zambiri amakumana ndi mikangano, kuwonjezera pa kusakaniza kuyenera kuwonjezeredwa, chiŵerengero cha laimu ndi mchenga, mchenga wophwanyidwa ndi zomwe zili mu ufa wamwala ziyenera kuyendetsedwa.