Cov yam tseem ceeb uas cuam tshuam rau lub zog ntawm cov cement mortar muaj xws li qib cement zog thiab ntau npaum li cas, dej - cement ratio, xuab zeb zoo, curing tej yam kev mob, thiab sib tov uniformity. Cov yam tseem ceeb no sib sau ua ke txiav txim siab zaum kawg lub zog thiab durability ntawm mortar.
Cement Strength Grade thiab Dosage: Cement yog cov khoom siv tseem ceeb hauv mortar uas ua raws li kev khi. Cov qib cement ntau dua, qhov siab dua qhov muaj peev xwm ntawm cov mortar. Nyob rau hauv ib tug tej yam ntau yam, tsim nyog nce cov cement ntau npaum yuav txhim kho mortar zog. Txawm li cas los xij, cov cement me me yuav tsis ua tau raws li qhov yuav tsum tau muaj zog, thaum ntau dhau tuaj yeem ua rau muaj zog shrinkage thiab cov nqi siab dua.
Dej-Cement Ratio (Dej-Cement Ratio): Cov dej-cement ratio yog hais txog qhov loj ntawm cov dej rau cement. Cov dej ntau dua- cement piv ua rau ntau qhov pores hauv cov tshuaj khib, txo qhov ntom ntom thiab yog li lub zog. Hloov pauv, qhov dej tsawg - cement piv, thaum nce zog, txo kev ua haujlwm thiab cuam tshuam rau kev tsim kho. Yog li ntawd, nws yuav tsum tau tswj kom tsim nyog raws li kev tsim kho.
Sand Quality: The particle size distribution, coarseness, and mud content of sand directly affect mortar performance. Well-graded, clean medium sand improves bonding strength and density; excessive mud content (>5%) ua kom tsis muaj zog ntawm cov cement thiab xuab zeb, txo lub zog thiab nce shrinkage.
Curing Conditions: Kev tsim kho lub zog mortar nyob ntawm cov cement hydration thiab xav tau qhov kub thiab av noo tsim nyog. Cov txheej txheem kho yog qhov kub ntawm 20 ± 2℃thiab cov av noo txheeb ze Ntau dua lossis sib npaug li 90%. Kev poob dej thaum ntxov lossis qis qis (<5℃) interrupt hydration, leading to insufficient strength development.
Mixing Uniformity thiab Sijhawm: Kev sib xyaw tsis txaus ua rau kev faib khoom tsis sib xws, tsim kom muaj chaw tsis muaj zog. Ua kom lub sij hawm sib tov txaus (feem ntau tsis pub tsawg tshaj 90 vib nas this) ua kom cov mortar sib xyaw thiab txhim kho kev ua tau zoo tag nrho.
Mixing Uniformity thiab Sijhawm: Kev sib xyaw tsis txaus ua rau kev faib khoom tsis sib xws thiab thaj chaw tsis muaj zog. Lwm yam cuam tshuam:
Admixtures: xws li plasticizers, tuaj yeem txhim kho kev ua haujlwm, tab sis ntau dhau yuav txo tau lub zog;
Kev tsim kho ib puag ncig: kub kub thiab huab cua qhuav tuaj yeem ua rau mortar poob dej sai heev, cuam tshuam rau kev txhim kho lub zog;
Substrate absorbency: Thaum siv rau cov cib masonry heev absorbent, mortar zog mas nyob ntawm tus nqi ntawm cov cement; thaum siv rau pob zeb ntom ntom, nws cuam tshuam ntau dua los ntawm dej - cement ratio.