siv cov khoom sib xyaw ntub dej sib xyaw; raws li qhov hnyav ntawm mortar siv 0.04% -0.06% master-batch khoom.
nrog rau kev ua tau zoo dua li ntawm qhov chaw sib xyaw mortar nyob rau hauv txhua qhov chaw, cov mortar ntub dej sib xyaw kom raug thiab tuaj yeem haum nrog ntau lub cim mortar, zam kev hloov pauv zoo los ntawm kev ua haujlwm ntawm qhov chaw, mortar tuaj yeem siv los daws ntau lub tsev. teeb meem zoo li hollowing thiab cracking.