Kodi konkriti imatenga nthawi yayitali bwanji kuti iume?

Buku Lothandiza Kwambiri Lokhudza Kuumitsa ndi Kukonza Konkriti: Kuyambira Kuthira Mpaka Kulimba Kwambiri

Konkirendi chimodzi mwa zipangizo zomangira zomwe zimagwiritsidwa ntchito kwambiri padziko lonse lapansi, zomwe zimayamikiridwa chifukwa cha kulimba kwake, kusinthasintha kwake, komanso kugwiritsa ntchito bwino ndalama. Komabe, magwiridwe ake amadalira kuumitsa ndi kuyeretsa bwino—njira zomwe nthawi zambiri sizimamvetsetsedwa bwino kapena kusakanizidwa. Bukuli la mawu 3,000 limafufuza sayansi, nthawi, ndi njira zabwino kwambiri zoumitsira konkire, kuyeretsa, ndi kupeza mphamvu zabwino kwambiri.

1. Kumvetsetsa "Kuuma" kwa Konkriti vs. Kukonza

Musanayambe kufufuza nthawi, ndikofunikira kusiyanitsa pakati pakuumitsa(kutuluka kwa madzi) ndikuchiritsa(kusungunuka kwa simenti).

• Kuumitsa: Amatanthauza kusungunuka kwa madzi ochulukirapo kuchokera pamwamba pa konkire. Ngakhale kuti chinyezi cha pamwamba chikhoza kutha mkati mwa maola ochepa, chinyezi chamkati chikhoza kukhalapo kwa milungu ingapo.
• Kuchiritsa: Njira ya mankhwala pomwe madzi amakumana ndi tinthu ta simenti (hydration), ndikupanga zomangira zomwe zimalimbitsa konkire. Kukhazikika bwino kumatsimikizira mphamvu, kulimba, komanso kukana kusweka.

Chofunika ChotengeraKonkire siuma “monga mwachizolowezi—imachira chifukwa cha madzi, zomwe zimafuna kusunga chinyezi.

2. Magawo a Kukhazikitsa ndi Kulimbitsa Konkire

Nthawi yoyambira kuthira mpaka mphamvu yonse imaphatikizapo magawo osiyanasiyana:

Gawo 1: Seti Yoyamba (Maola 2-6)

• Kusintha kwa konkriti kuchoka pamadzimadzi kupita ku konkire.
• Kuyenda ndi mapazi: Kuyenda pang'ono kwa anthu oyenda pansi kungatheke pakatha maola 24-48.

Gawo 2: Seti Yomaliza (Maola 6–12)

• Pamwamba pake pamakhala polimba mokwanira kuti pasakhale madontho ang'onoang'ono.
• Mafomu amatha kuchotsedwa, koma simenti imakhalabe yofooka.

Gawo 3: Mphamvu Yoyambirira (Masiku 1–7)

• Imapeza ~70% ya mphamvu ya kapangidwe kake m'masiku 7 (pa zosakaniza wamba).
• Zotetezeka pamagalimoto opepuka (monga magalimoto) patatha masiku 7.

Gawo 4: Kuchira Kwathunthu (Masiku 28)

• Muyezo wa mafakitale wa "mphamvu zonse" (mphamvu ya kapangidwe ka 100%).
• Makina olemera ndi katundu wopangidwa ndi nyumba ndi ololedwa.

Gawo 5: Kutaya Madzi M'thupi Kwa Nthawi Yaitali (Miyezi Mpaka Zaka)

• Konkire imapitiriza kuuma pang'onopang'ono kwa zaka zambiri.

3. Zinthu Zomwe Zimakhudza Nthawi Youma ndi Kuchiritsa

Nthawi zimasiyana malinga ndi momwe zinthu zilili, kapangidwe kake, ndi zomwe polojekitiyi ikufuna:

A. Zinthu Zachilengedwe

1. Kutentha:
   • Mitundu Yabwino Kwambiri: 50–90°F (10–32°C).
   • Nyengo Yozizira (<50°F): Zimachedwetsa madzi; zimafuna kutenthetsa kapena kutentha.
   • Nyengo Yotentha (>90°F): Imafulumizitsa kuumitsa pamwamba, zomwe zimapangitsa kuti pakhale ming'alu. Gwiritsani ntchito utsi kapena mthunzi.
2. Chinyezi:
   • Chinyezi chochuluka chimachepetsa kuuluka kwa madzi, zomwe zimathandiza kuti madzi asamalowe m'nthaka.
   • Chinyezi chochepa chimathandiza kuti pamwamba pakhale pouma mofulumira, zomwe zimapangitsa kuti nembanemba ziume msanga.
3. Mphepo: Imawonjezera kuchuluka kwa nthunzi, zomwe zimapangitsa kuti pulasitiki ichepetse ming'alu.

B. Kapangidwe ka Konkriti Wosakaniza

1. Chiŵerengero cha Madzi ndi Simenti: Ziŵerengero zochepa (0.4–0.6) zimathandizira kukulitsa mphamvu koma zimafuna kukonzedwa mosamala.
2. Zosakaniza:
   • Zofulumizitsa(monga, calcium chloride): Chepetsani nthawi yokhazikitsa.
   • Obwezera: Kuchedwa kukhazikika m'malo otentha.
   • Pozzolans(phulusa la ntchentche, utsi wa silika): Mphamvu imawonjezeka pang'onopang'ono koma imawonjezera kulimba kwa nthawi yayitali.
3. Mtundu wa Konkire:
   • Konkireti Yolimba Kwambiri Yoyambirira: Imafika pa 3,000 psi mu maola 24.
   • Zosakaniza Zokhazikika: 3,000–4,000 psi pa masiku 28.

C. Zofunikira pa Pulojekiti

1. Kukhuthala kwa Slab: Zigawo zokhuthala zimasunga chinyezi kwa nthawi yayitali, zomwe zimachepetsa kuuma kwa pamwamba.
2. Kulimbikitsa: Chitsulo chokhazikika kapena maukonde amatha kusunga chinyezi, zomwe zingakhudze kufanana kwa kuuma.

4. Njira Zochiritsira Kuti Mukhale ndi Mphamvu

Kukonza madzi kumathandiza kuti madzi azisungidwa. Njira zodziwika bwino ndi izi:

1. Kuchiritsa Madzi:
   • Kuphimba ndi madzi, kuwaza, kapena kunyowetsa zivundikiro za burlap (osachepera masiku 7).
   • Zabwino kwambiri pazinthu zomangidwa monga matabwa ndi mizati.
2. Zopangira Ma Membrane:
   • Zotsekera zopopera zimachepetsa kuuluka kwa madzi.
   • Amagwiritsidwa ntchito pa matabwa ndi miyala.
3. Kuphimba ndi Pulasitiki/Ma Tarps:
   • Imasunga chinyezi; imafuna kunyowetsa nthawi ndi nthawi.
4. Kuchiritsa Nthunzi:
   • Zimathandizira kupeza mphamvu mu konkire yokonzedwa kale (monga maola 18-24).

5. Kuyesa Kukonzekera Konkriti

1. Mayeso Olimba Pamwamba:
   • Mayeso a Chala Chaching'ono: Palibe kulowetsa mkati mutakanikiza ndi chala chachikulu.
   • Mayeso Okanda: Kukana screwdriver kapena msomali.
2. Mayeso Olimba a Mphamvu:
   • Zitsanzo za silinda zinayesedwa masiku 7 ndi 28 m'ma lab.
3. Mamita a Chinyezi:
   • Yesani kuchuluka kwa chinyezi mkati (<4% pa kukhazikitsa pansi).

6. Zolakwa Zofala ndi Momwe Mungapewere

• Kutsegula msangaPewani katundu wolemera pasanathe masiku 28.
• Kuchiritsa Kosakwanira: Zimayambitsa kufumbi, kukula, komanso kusakhala ndi nthawi yolimba.
• Kuthirira madzi mopitirira muyeso: Zimafooketsa gawo la pamwamba.

7. Milandu Yapadera ndi Mafunso Ofunsidwa Kawirikawiri

• Nyengo YoziziraGwiritsani ntchito mabulangeti oteteza kutentha kapena malo otenthetsera.
• Kugwa kwa Mvula: Tetezani konkire yatsopano ndi ma tarps; mvula ikagwa pambuyo pa maola 4-8 siiwononga kwambiri.
• Mapulojekiti OfulumiraGwiritsani ntchito zosakaniza zolimba kwambiri kapena zotsukira nthunzi.

KonkireNthawi ya "kuumitsa" imatenga maola ambiri kuti pamwamba pakhale nthunzi koma imatenga masiku 28 kuti pakhale mphamvu yopangira. Kukonza bwino sikungakambirane kuti pakhale kulimba, ndipo zinthu zachilengedwe ziyenera kusamalidwa mosamala. Pomvetsetsa sayansi ya madzi ndi kugwiritsa ntchito njira zabwino, makontrakitala ndi Opanga Zinthu Zoyenera amatha kutsimikizira kuti nyumba za konkriti zimakhala zolimba komanso zolimba kwa nthawi yayitali.