Yuav ua li cas txhim kho dej tuav ntawm pob zeb

1. Kho kev siv cement

🔹 a. Nce Cement Cov ntsiab lus: Tsim nyog nce cov cement cov ntsiab lus tuaj yeem txhim kho cov dej tuav tau los ntawm kev nce cov cement paste. Cov cement paste, uas npog cov npoo ntawm cov aggregates, pab tiv thaiv kom tsis txhob muaj dej ntws tawm. Txawm li cas los xij, kev siv cov cement ntau dhau tuaj yeem ua rau cov nqi ntau dua thiab nce shrinkage deformation, yog li nws yuav tsum tau tswj kom tsim nyog.
🔹 b. Xaiv Txoj Cai Cement: Ntau hom cement muaj peev xwm khaws tau dej sib txawv. Piv txwv li, pozzolanic Portland cement feem ntau muaj cov khoom tuav dej zoo dua, ua rau nws xaiv zoo thaum yuav tsum tau khaws dej siab.

2. Siv Admixtures

🔹 a. Air-Entraining Agents: Air-entraining agents qhia ib tug loj tus me me, uniformly faib pa npuas rau hauv lub pob zeb. Cov npuas no thaiv cov capillary pores hauv cov pob zeb, ua kom cov dej ntws qeeb qeeb, yog li txhim kho dej tuav. Tsis tas li ntawd, cov neeg ua haujlwm huab cua tuaj yeem txhim kho kev ua haujlwm ntawm cov pob zeb.
🔹 b. Dej Retaining Agents (xws li Cellulose Ether): Cellulose ether-based water-retaining agents yog ib qho kev xaiv zoo. Lawv ua kom cov viscosity ntawm cov cement paste, ua rau nws nyuaj rau dej kom dim. Cov neeg ua haujlwm no adsorb rau saum npoo ntawm cov cement particles, tsim cov yeeb yaj kiab tiv thaiv uas ua los tiv thaiv kom tsis txhob poob dej.

3. Optimizing Aggregates

🔹 a. Xaiv qhov tsim nyog Aggregates: Nws yog ib qho tseem ceeb uas yuav tau xaiv cov aggregates nrog tus nqi qis, xws li cov pob zeb limestone tuab. Aggregates nrog tus nqi nqus siab yuav nqus dej los ntawm cov cement paste, txo cov dej tuav.
🔹 b. Txhim kho Aggregate Gradation: Siv cov khoom sib txuas tsis tu ncua, qhov twg cov khoom sib txawv ntawm qhov sib txawv sib haum ua ke, pab txo cov voids hauv cov pob zeb. Nrog cov voids tsawg, muaj tsawg txoj hauv dej kom khiav tawm, txhim kho kev tuav dej.

Cov txiaj ntsig ntawm Kev Tiv Thaiv Dej tsis zoo hauv pob zeb:

1. Qhov teeb meem zoo

🔹 a. Ntshav: Kev tuav dej tsis zoo ua rau los ntshav hauv cov pob zeb. Cov dej ntau dhau uas nce mus rau saum npoo ua ib zaj duab xis dej. Thaum cov pob zeb tawv tawv, cov yeeb yaj kiab dej no evaporates, ua rau muaj kev sib txuas tsis muaj zog ntawm cov cement paste thiab cov pob zeb hauv qab, uas tuaj yeem ua rau hmoov thiab tev. Qhov no cuam tshuam rau saum npoo lub zog thiab flatness.
🔹 b. Qhov Defects thiab Xim Variation: Los ntshav tuaj yeem hloov kho qhov sib xyaw ntawm cov mortar rau ntawm qhov chaw ntawm cov pob zeb, ua rau cov xuab zeb streaks, thiab xim variation nyob rau hauv ntau qhov chaw, uas cuam tshuam rau qhov pom kev zoo ntawm cov pob zeb.

2. Kev puas tsuaj sab hauv

🔹 a. Kev cais: Kev poob dej ua rau tsis sib npaug ntawm cov khoom xyaw hauv cov pob zeb, ua rau muaj kev sib cais. Cov coarse aggregates zoo li tog, thaum lub mortar thiab dej sib sau rau saum, ua rau hauv cov qauv xoob. Qhov no ua rau lub pob zeb tsis muaj zog thiab kav ntev.

3. Kev cuam tshuam rau kev tsim kho

🔹 a. Ntxiv sijhawm tsim kho: Cov teeb meem xws li los ntshav thiab kev cais tawm los ntawm kev tuav dej tsis zoo yuav tsum muaj sijhawm ntxiv rau cov neeg ua haujlwm los daws. Piv txwv li, cov neeg ua haujlwm yuav tsum tau tos kom cov ntshav nres lossis rov sib xyaw ua ke, uas txuas ntxiv mus rau kev tsim kho.
🔹 b. Txo kev ua haujlwm zoo: Kev tuav dej tsis zoo tuaj yeem ua rau muaj kev tsis sib haum xeeb hauv cov pob zeb ua kom muaj dej txaus thaum lub sij hawm nchuav, uas cuam tshuam rau ob qho tib si ceev thiab zoo ntawm lub ncuav, txo kev tsim kho. Piv txwv li, thaum siv cov pob zeb ua pob zeb, los ntshav thiab kev sib cais tuaj yeem ua rau muaj kev cuam tshuam hauv cov kav dej, ua rau ncua kev tu thiab tu, ua rau muaj kev cuam tshuam ntxiv.

Kev daws los txhim kho dej tuav hauv pob zeb:

1. Kho Cement-Related Factors

🔹 a. Nce Cement Cov ntsiab lus: Ua kom cov cement ntau tuaj yeem ua rau cov cement paste, zoo dua encapsulating cov aggregates thiab khaws cov dej noo. Txawm li cas los xij, yuav tsum tau ceev faj kom tsis txhob siv cov cement ntau dhau, uas tuaj yeem ua rau tawg tawg.
🔹 b. Hloov Cement Hom: Xaiv cov cement nrog cov khoom tuav dej zoo dua, xws li pozzolanic Portland cement, uas yog qhov muaj zog ntawm cov dej tuav, tshwj xeeb tshaj yog thaum xav tau kev tuav dej siab.

2. Kev siv cov khoom sib xyaw kom zoo

🔹 a. Ntxiv Air-Entraining Agents: Air-entraining agents qhia qhov sib npaug ntawm cov pa npuas me me rau hauv cov pob zeb, uas thaiv cov hlab ntsha ntawm cov hlab ntsha thiab txo cov dej tsiv teb tsaws, yog li txhim kho cov dej tuav. Cov neeg ua haujlwm no kuj txhim kho kev ua haujlwm ntawm cov pob zeb.
🔹 b. Siv cov tshuaj tiv thaiv dej (xws li Cellulose Ether): Cov dej khaws cia zoo li cellulose ether tuaj yeem ua kom cov viscosity ntawm cov cement paste. Lawv adsorb rau saum npoo ntawm cov cement hais, tsim cov yeeb yaj kiab tiv thaiv uas tiv thaiv dej tsis zoo, txhim kho dej tuav tau zoo.

3. Optimize Aggregate xaiv thiab feem

🔹 a. Xaiv qhov tsim nyog Aggregates: Opt rau aggregates nrog tsawg absorbing tus nqi, xws li ntom limestone, uas nqus dej tsawg los ntawm cov cement paste, pab tswj cov dej tuav hauv cov pob zeb.
🔹 b. Txhim kho Aggregate Gradation: Siv cov graded graded aggregates tsis tu ncua uas cuam tshuam qhov sib txawv ntawm qhov ntau thiab tsawg, txo cov voids hauv cov pob zeb thiab txo cov dej kom khiav tawm, yog li txhim kho cov dej tuav.