Tam sim no, cov khoom sib sau tsis tuaj yeem thauj mus los ntev; Tej zaum peb yuav paub zoo txog cov yam ntxwv ntawm cov xuab zeb zoo tagnrho thiab cov coarse aggregates, tab sis peb tsis tuaj yeem tau txais cov aggregates. Hauv lwm lo lus, peb tsuas tuaj yeem siv cov ntaub ntawv uas twb muaj lawm. Tom qab kev tshawb fawb, peb tuaj nrog cov hauv paus ntsiab lus hauv qab no:
1. Ntev npaum li cov pob zeb ua tau raws li qhov xav tau ntawm kev ua haujlwm thiab cov khoom sib xyaw yog huv si thiab ruaj khov, lub zog ntawm cov pob zeb sib xyaw yog nyob ntawm tus nqi ntawm cov dej hauv batch, uas tuaj yeem qhia tau los ntawm qhov ntim piv ntawm cov dej thiab cov cement.
2. Cov nyhuv ntawm cov cement sib txawv tuaj yeem cuam tshuam los ntawm qhov sib txawv ntawm cov dej-cement piv.
3. Kev tsim cov pob zeb sib xyaw ua ke yuav tsum yog raws li kev tshuaj ntsuam xyuas ntawm qhov sib xyaw. Nyob rau hauv cov xwm txheej ntawm kev txiav txim siab kev ua haujlwm ntawm cov pob zeb, muaj kev sib raug zoo heev ntawm qhov loj me thiab kev ua kom tiav ntawm cov aggregate thiab qhov yuav tsum tau siv dej.
4. Kev sib sau tsis tas yuav tsum tau, thiab nws tsis tsim nyog rau kev faib ua feem raws li qhov kev ntsuas taag; gradation ntawm aggregate tej zaum yuav txawv nyob rau hauv ib tug ntau yam, tab sis nws tsis tas yuav cuam tshuam rau tus nqi ntawm cov dej los yog cov pob zeb zoo.
5. Plasticity lossis workability yog qhov yuav tsum tau ua ntawm cov pob zeb ua vaj tse.
