Zotsatira za hydroxyethyl methl cellulose (hemc) pa nthawi yopanga ma connerete

Nthawi yokhazikitsa konkriti ndi gawo lofunikira lomwe limakhudza mtundu wake womanga ndi kupita patsogolo. Ngati nthawi yokhala ndi nthawi nditatali kwambiri, zingayambitse kuyenda pang'onopang'ono ndikuwononga konkriti yolimba; Ngati nthawi yakhala yochepa kwambiri, zitha kubweretsa zovuta pakupanga konkriti ndikukhudza ntchito yomanga ya polojekiti. Kuti musinthe nthawi ya konkriti, kugwiritsa ntchito ma Adminictures tsopano ndi njira yodziwika bwino pakupanga konkriti yamakono.Hydroxyethyl methl cellulose (hemc), monga cellulose wamba wosinthika, umagwiritsidwa ntchito kwambiri mu katswiri wazovala konkriti ndipo amatha kusokoneza chinsinsi, kusungidwa kwamadzi, kusungidwa kwamadzi, kukhazikitsa nthawi ndi zina mwa konkriti.1. Zoyambira za hemc

Hemc ndi cellulose yosinthidwa, yomwe nthawi zambiri imapangidwa kuchokera ku cellulose kapena cellose ndi methylation zimachitika. Ili ndi madzi abwino kusungunuka, kukula, kusungidwa kwamadzi ndikugunda katundu, motero amagwiritsidwa ntchito pomanga, zopangira, mankhwala tsiku lililonse. Ku konkriti, hemo nthawi zambiri amagwiritsidwa ntchito ngati thiccener, wothandizila madzi ndi rheology controlm othandizira, omwe amatha kukonza kugwiritsidwa ntchito kwa konkriti, kumawonjezera chitsamba chomata ndi nthawi yayitali.

2. Zotsatira za hemc pa nthawi ya konkriti
Kuchedwa kukhazikitsa nthawi
Monga cellulose yochokera ku cellulose, hemoc imakhala ndi magulu ambiri a hydrophilic mu mawonekedwe ake, omwe amatha kulumikizana ndi mamolekyulu amadzi kuti apange ma hydracs okhazikika, pochepetsa simenti momera. Zomwe zimathandizira simenti ndi njira yayikulu yolimbikitsira konkriti, ndipo kuwonjezera kwa hemc kungakhudze nthawi yokhazikika kudzera m'njira zotsatirazi:

Kupititsa patsogolo madzi: hemc imatha kusintha madzi osakhazikika, kuchepetsa madzi opopera, ndikuwonjezera nthawi ya simenti hydrate. Kudzera mu kusungidwa kwamadzi, hemoc imatha kupewa kutaya madzi ambiri, poyerekeza ndi kupezeka koyambirira ndi komaliza.

Kuchepetsa kutentha kwa hydration: hemc kumatha kulepheretsa kuthana ndi kuchepa kwa tinthu tating'onoting'ono pochulukitsa ma conpenti a konkriti ndikuchepetsa kuthamanga kwa simenti. Chiwerengero cha hydrate chimathandizira kuchedwetsa nthawi ya konkriti.

Kusintha kwa Rheogical: hemc imatha kusintha zinthu za simenti, zimawonjezera mafayilo ake, ndikupewa mawonedwe amadzi abwino kwambiri, kupewa zovuta zomanga chifukwa cha mgwirizano wambiri.

Kukopa Zinthu
Zotsatira zaHemoPanthawi yake siyogwirizana kwambiri ndi mlingo wake, komanso okhudzidwa ndi zinthu zina zakunja:

Kulemera kwa maselo ndi digiri ya kulowetsedwa kwa hemc: Kulemera kwa ma molecular ndi digiri yazolowa (kuchuluka kwa zolowa m'malo mwa ethyl ndi methyl) ya hemc imakhala ndi chidwi chachikulu pakuchita kwake. Hemc yokhala ndi zolemera zapamwamba komanso kuchuluka kwazomwe zimakhazikika nthawi zambiri kumatha kupanga mawonekedwe amphamvu a network, kuwonetsa kusungidwa kwabwino kwamadzi komanso katundu wambiri, kotero kuti kuchepetsedwa kwa nthawi yokhazikika ndikofunika kwambiri.

Mtundu wa simenti: Mitundu Yosiyanasiyana ya simenti imakhala ndi mitengo yosiyanasiyana ya hydraction, motero zotsatira za hemo pa makina osiyanasiyana ndi osiyananso. Simenti wamba ya Portland ili ndi kuchuluka kwa hydter, pomwe simenti yotsika kapena simenti yapadera ili ndi kuchuluka kwa hydrable, ndipo gawo la hemo mu machitidwewa lingakhale lotchuka kwambiri.

Zinthu Zachilengedwe: Zinthu zachilengedwe monga kutentha ndi chinyezi zimakhala ndi chinyezi chofunikira pa nthawi ya konkriti. Kutentha kwambiri kumathandizira pakutha kwa simenti, chifukwa chofupikirako, komanso zotsatira za hemc moyenera kufooka. M'malo mwake, m'malo ochepa kutentha, kuchedwa kwa hemc kungakhale kowonekera kwambiri.

Kukhazikika kwa hemc: Kukhazikika kwa hemc mwachindunji kumasankha kuchuluka kwa zomwe zimamuthandiza. Kukhazikika kwa hemc kumatha kuwonjezera madzi ndi rhelogy ya konkriti, poyerekeza ndi nthawi, koma hemc imatha kuchititsa kuti madzi akhale konkire komanso amathandizira.

Zotsatira zoyipa za hemc ndi ma admixtive ena
Hemc nthawi zambiri amagwiritsidwa ntchito ndi ma admintires ena (monga mapiritsi am'madzi, ogulitsa, etc.) kuti asinthe konkriti. Ndi mgwirizano wa ogulitsa, kukhazikitsa kwa hemc kungakhale kotalikirananso. Mwachitsanzo, syrneg imakhudzanso zolaula zina monga ma phosphates okhala ndi hemc zimatha kukulitsa nthawi yokhazikika, yomwe ndiyoyenera majekiti apadera kapena yofunika kwambiri.

3. Zotsatira zina za hemoc pamagawo a konkriti

Kuphatikiza pa kuchedwetsa nthawi, hemac nawonso kumakhalanso kofunikira pa simenti ina ya konkriti. Mwachitsanzo, hemo amatha kusintha madzi, kukana, kupempukutira magwiridwe antchito ndi kukhazikika kwa konkriti. Posintha nthawi yanyumba, zotsatira za madzi zolimbitsa thupi za hemc zitha kupewa kusankhana kapena kutulutsa magazi kwa konkriti, ndikusintha mawonekedwe onse ndi kukhazikika kwa konkriti.

Hydroxyethyl methylcellulose (hemc) imatha kuchedwetsa bwino kukhazikitsa nthawi ya konkriti yosungirako madzi abwino, zotsatira zake zokulirapo. Kuchuluka kwa hemc kumakhudzidwa ndi zinthu monga kulemera kwake, kuchuluka kwa kulowetsa, mtundu wa sitenti, kuphatikiza kutengera ndi zachilengedwe. Pogwiritsa ntchito Mlingo ndi gawo limodzi la hemac, nthawi yokhazikitsa nthawi yomwe ingathe kukuwunikira ntchito yomanga konkriti, komanso kugwirira ntchito ndi kukhazikika kwa konkriti kumatha kusintha. Komabe, kugwiritsa ntchito hemc kumatha kubweretsanso mavuto, monga madzi osayenera kapena madzi osakwanira, chifukwa chake amafunikira kugwiritsidwa ntchito mosamala malinga ndi zosowa zenizeni.