Tsiku Lotumiza: 8, Jan, 2024
Makhalidwe a wothandizira madzi kuchepetsa mwachindunji zimakhudza shrinkage ntchito konkire. Pansi pa kugwa kwa konkire komweko, kutsika kwa konkire ndi wothandizira kuchepetsa madzi ndi pafupifupi 35% kuposa konkire popanda wothandizira kuchepetsa madzi. Chifukwa chake, ming'alu ya konkriti ndiyotheka kuchitika. Ichi ndichifukwa chake:
1. Mphamvu yochepetsera madzi imadalira kwambiri zinthu zopangira konkriti ndikusakaniza.
Mlingo wochepetsera madzi wa konkire ndi tanthawuzo lolimba kwambiri, koma nthawi zambiri limayambitsa kusamvana. Nthawi zambiri, anthu amagwiritsa ntchito kuchuluka kwa kuchepetsa madzi kuti afotokoze momwe madzi amachepetsa.
Pa mlingo wochepa, kutenga mankhwala ochepetsa madzi a polycarboxylate monga mwachitsanzo, zatsimikiziridwa kuti mlingo wake wochepetsera madzi ndi wochuluka kwambiri kuposa wa mitundu ina yochepetsera madzi, ndipo imakhala ndi zotsatira zabwino zochepetsera madzi. Komabe, ziyenera kuzindikirika kuti poyerekeza ndi zinthu zina zochepetsera madzi, mphamvu yochepetsera madzi ya polycarboxylate yochepetsera madzi imakhudzidwa kwambiri ndi mayeso.
Zina mwa zinthu zomwe zimakhudza pulasitiki ya polycarboxylate superplasticizer, kuchuluka kwa mchenga ndi kugawanika kwa tinthu kophatikizana konkire kumakhudzanso kwambiri. Poyerekeza ndi zida zina zochepetsera kwambiri madzi monga mndandanda wa naphthalene, mphamvu ya pulasitiki ya polycarboxylate yochepetsera madzi imakhudzidwa kwambiri ndi matope omwe amaphatikiza bwino.
2. Mphamvu yochepetsera madzi imadalira kwambiri mlingo wa mankhwala ochepetsa madzi.
Kawirikawiri, pamene mlingo wa mankhwala ochepetsera madzi ukuwonjezeka, kuchepetsa madzi a konkire kumawonjezekanso, makamaka kwa polycarboxylic acid-based based reduction agents, mlingowo umakhudza mwachindunji kuchepetsa madzi.
Komabe, pali kuchotserapo mu ntchito zothandiza. Ndiye kuti, pambuyo pa mlingo wina, zotsatira zochepetsera madzi "zimachepa" pamene mlingo ukuwonjezeka. Izi zili choncho chifukwa panthawiyi kusakaniza kwa konkire kumakhala kolimba, konkire imakhala ndi magazi aakulu, ndipo Chilamulo cha slump sichingathenso kufotokoza zamadzimadzi ake.
3. Kuchita kwa osakaniza konkire okonzeka kumakhudzidwa kwambiri ndi madzi.
Zizindikiro za ntchito zosakaniza konkire nthawi zambiri zimawonetsedwa pazinthu monga kusunga madzi, mgwirizano, ndi fluidity. Konkire yokonzedwa ndi polycarboxylic acid-based superplasticizers nthawi zonse imakwaniritsa zofunikira zogwiritsira ntchito. Kuchita kwa konkire okonzeka kusakaniza kumakhala kovuta kwambiri pakumwa madzi, ndipo mavuto ena amapezeka nthawi zambiri.
Nthawi yotumiza: Jan-08-2024
