Nkhani

Kukula kwa zomangamanga zolimbitsa

Pakadali pano, konkire wolimbitsa ndiye mawonekedwe omwe amagwiritsidwa ntchito kwambiri ku China, kuwerengera ambiri. Nthawi yomweyo, ndi malo omwe amakhala ndi konkire wolimba kwambiri padziko lapansi. Kutulutsa kwa simenti yake yayikulu yakuda kudafika matani 1.882 biliyoni mu 2010, zomwe zimawerengera pafupifupi 70% yazomwe zapadziko lonse lapansi.

Ntchito mfundo konkire analimbitsa

Zomwe zimakhalira kuti konkire yolimba igwire ntchito limodzi zimatsimikizika ndi zida zake. Choyamba, mipiringidzo yachitsulo ndi konkriti imakhala ndi koyefishienti yofanana yakukula kwamatenthedwe, ndipo kutalika kwa mipiringidzo yazitsulo ndi konkriti ndikuchepa kwambiri kutentha komweko. Kachiwiri, konkire ikauma, pamakhala mgwirizano wabwino pakati pa simenti ndi cholimba pamwamba, kotero kuti kupsinjika kulikonse kumatha kusamutsidwa bwino pakati pawo; Nthawi zambiri, pamwamba pazowonjezera zimakonzedwanso mu nthiti zamakola zosalala komanso zopatukana (zotchedwa rebar) kupititsa patsogolo mgwirizano pakati pa konkriti ndi kulimbitsa; Izi zikadali zosakwanira kusamutsa mkangano pakati pa zolimba ndi konkriti, kumapeto kwa kulimbikitsako nthawi zambiri kumakhala koyesa madigiri 180. Chachitatu, zinthu zamchere mu simenti, monga calcium hydroxide, potaziyamu hydroxide ndi sodium hydroxide, zimapereka malo amchere, omwe amapanga kanema wachitetezo pamwamba pakulimbitsa, kotero kumakhala kovuta kuwononga kuposa kulimbitsa m'malo osaloŵerera komanso acidic. Nthawi zambiri, chilengedwe chokhala ndi pH pamwamba pa 11 chimatha kuteteza kulimba ku dzimbiri; Mukakhala mlengalenga, phindu la pH la konkriti wolimbitsa limachepa pang'onopang'ono chifukwa cha asidi wa kaboni dayokisaidi. Ikakhala yochepera kuposa 10, zolimbikitsazo zimakhala zonyansa. Chifukwa chake, ndikofunikira kuwonetsetsa makulidwe azitsulo zoteteza panthawi yomanga ntchito.

Makulidwe ndi mtundu wazowonjezera zosankhidwa

Zomwe zimalimbikitsidwa mukonkriti wolimbitsa nthawi zambiri zimakhala zazing'ono, kuyambira 1% (makamaka pamatabwa ndi slabs) mpaka 6% (makamaka mzati). Gawo lolimbitsa ndi lozungulira. Kukula kwazolimba ku United States kumawonjezeka kuchokera pa 0,25 mpaka 1 inchi, kukulira ndi 1/8 inchi mgulu lililonse; Ku Europe, kuyambira 8 mpaka 30 mm, kukulira 2 mm pagawo lililonse; Dziko lachi China lagawika magawo 19 kuyambira millimeter 3 mpaka 40. Ku United States, malinga ndi zomwe zili mu kaboni muzowonjezera, zidagawika 40 zitsulo ndi 60 zitsulo. Otsatirawa amakhala ndi mpweya wokwanira, mphamvu komanso kuuma, koma ndizovuta kupindika. M'malo owononga, mipiringidzo yazitsulo yopangidwa ndi electroplating, epoxy resin ndi chitsulo chosapanga dzimbiri imagwiritsidwanso ntchito.