Thaum nws los txog rau tons ntawm lub hnab, nws yog ib qho tsim nyog yuav tsum tau them sai sai rau qhov sib txawv ntawm ntau yam khoom siv hauv tons ntawm lub hnab, kev siv cov khoom sib txawv yuav ua rau lub hardness, lub zog thiab practicality ntawm tons ntawm lub hnab, yog li thawj qhov khoom. los xav txog yog qhov zoo ntawm ib tuj ntawm lub hnab, txwv tsis pub txawm tias nws pheej yig tab sis nws yuav tsis siv sij hawm ntev los hnav, ces tus nqi piv ntawm cov khoom no yog qhov tsawg heev.
Yog li ntawd, thaum yuav khoom, peb yuav tsum xub saib qhov kev ua tau zoo ntawm kev thauj khoom los txiav txim siab seb puas yuav khoom. Ntxiv nrog rau qhov kev ua tau zoo kuj yuav tsum xav txog qhov tseem ceeb tshaj plaws yog tus nqi, tus nqi tuaj yeem xaiv tus nqi qis dua tsis pheej yig tsis dhau kim.
Lub hnab ntim khoom vim nws tus kheej muaj ntau qhov zoo, txawm hais tias nws muaj lub zog siab tab sis tsis txhob txhawj txog vim tias cov khoom nqa tau raug puas ntsoog, thiab lub hnab ntim khoom muaj cov plua plav pov thawj muaj zog, tab sis kuj muaj cov nyhuv noo noo, yog li ntawm kev thauj mus los, txawm tias tuav lossis khaws cia yuav tsis cuam tshuam cov khoom hauv lub hnab tuj.
Txawm hais tias cov khoom nrog ntse tsis tas yuav txhawj txog yuav khawb lub hnab ntim thiab ua rau kom xau, ton hnab txawm hais tias muaj ntau yam zoo tab sis tus nqi pheej yig heev, yog li tam sim no kev lag luam tsheb thauj mus los yuav siv ton hnab ntim los thauj qee qhov. cov ntaub ntawv granular.
Cov khoom siv dav siv, tshwj xeeb tshaj yog cov ntim ntawm cov cement ntau, nplej, tshuaj raw khoom, pub, starch, minerals thiab lwm yam hmoov, granular khoom, thiab txawm tias cov khoom txaus ntshai xws li calcium carbide, loading thiab unloading, tsheb thauj mus los, cia, yog yooj yim heev. . Cov khoom ntim khoom ntim khoom yog nyob rau theem ntawm kev loj hlob, tshwj xeeb tshaj yog nyob rau hauv daim ntawv ntawm ib tuj ntim thiab cov tais (ib lub tais ntim nrog lub thawv ntim, lossis plaub), uas yog nrov dua.