Tsiku Lotumiza: 8 Jul, 2024
1. Kuchepetsa madzi kumasinthasintha kuchoka pamwamba mpaka pansi, zomwe zimapangitsa kuti zikhale zovuta kulamulira panthawi ya polojekiti.
Zida zotsatsira za polycarboxylic acid ochepetsa madzi ochepetsa madzi nthawi zambiri zimalimbikitsa makamaka zochepetsera madzi, monga kuchepetsa madzi 35% kapena 40%. Nthawi zina kuchepa kwa madzi kumakhaladi kokwera kwambiri poyesedwa mu labotale, koma zikafika pamalo a polojekiti, nthawi zambiri zimakhala zodabwitsa. Nthawi zina kuchepetsa madzi kumakhala kosakwana 20%. Ndipotu, mlingo wochepetsera madzi ndi tanthawuzo lokhwima kwambiri. Zimangotanthauza kugwiritsa ntchito simenti ya benchmark, chiŵerengero chosakanikirana, njira yosakanikirana, ndi kuwongolera konkire ku (80 + 10) mm malinga ndi "Concrete Admixtures" GB8076 muyezo. data yoyesedwa panthawiyo. Komabe, anthu nthawi zonse amagwiritsa ntchito mawuwa pazochitika zosiyanasiyana kuti asonyeze zotsatira zochepetsera madzi za mankhwala, zomwe nthawi zambiri zimabweretsa kusamvana.
2. Kuchuluka kwa mankhwala ochepetsera madzi, ndi bwino kuchepetsa madzi.
Pofuna kukonza konkire yamphamvu kwambiri komanso kuchepetsa kuchuluka kwa simenti yamadzi, akatswiri opanga uinjiniya ndi akatswiri nthawi zambiri amafunikira kuwonjezera kuchuluka kwa ochepetsa madzi a polycarboxylate kuti apeze zotsatira zabwino. Komabe, mphamvu yochepetsera madzi ya polycarboxylic acid yochepetsera madzi imadalira kwambiri mlingo wake. Kawirikawiri, pamene mlingo wa mankhwala ochepetsera madzi ukuwonjezeka, kuchepetsa madzi kumawonjezeka. Komabe, atafika pa mlingo wina, kuchepetsa madzi ngakhale "kuchepa" pamene mlingo ukuwonjezeka. Izi sizikutanthauza kuti mphamvu yochepetsera madzi imachepa pamene mlingo ukuwonjezeka, koma chifukwa magazi aakulu amapezeka mu konkire panthawiyi, kusakaniza konkire kumawumitsidwa, ndipo fluidity imakhala yovuta kuwonetsera ndi njira yowonongeka.
Pofuna kuwonetsetsa kuti zotsatira za mayeso a zinthu zapolycarboxylic acid superplasticizer zonse zikugwirizana ndi miyezo, mulingo wamankhwala womwe umatchulidwa popereka kuti ukawunike sungakhale wokwera kwambiri. Choncho, lipoti loyang'anira khalidwe lazogulitsa limangowonetsa deta yofunikira, ndipo zotsatira za ntchitoyo ziyenera kutengera zotsatira zenizeni za polojekiti.
3. Konkire yokonzedwa ndi polycarboxylate yochepetsera madzi imatuluka magazi kwambiri.
Zizindikiro zomwe zikuwonetsa magwiridwe antchito a konkriti nthawi zambiri zimaphatikizapo fluidity, mgwirizano ndi kusunga madzi. Konkire yokonzedwa ndi zosakaniza zochepetsera madzi za polycarboxylic acid sizimakwaniritsa zofunikira pakugwiritsa ntchito, ndipo zovuta zamtundu wina zimachitika nthawi zambiri. Chifukwa chake, pamayesero enieni, nthawi zambiri timagwiritsabe ntchito mawu monga kuwonekera kwambiri mwala ndi kuwunjikana, kukhetsa magazi kwambiri komanso kulekanitsa, kuwunjika ndi kutsika pansi kuti afotokoze momveka bwino magwiridwe antchito a konkriti. Makhalidwe a zosakaniza za konkire zomwe zakonzedwa pogwiritsa ntchito zinthu zambiri zochepetsera madzi za polycarboxylic acid zimakhudzidwa kwambiri ndi kumwa madzi.
Nthawi zina kumwa madzi kumangowonjezereka ndi (1-3) kg/m3, ndipo kusakaniza konkire kumataya magazi kwambiri. Kugwiritsa ntchito kusakaniza kotereku sikungatsimikizire kufanana kwa kuthirako, ndipo kumapangitsa kuti pakhale maenje, mchenga, ndi mabowo pamwamba pa kapangidwe kake. Zolakwika zotere zosavomerezeka zimayambitsa kuchepa kwa mphamvu ndi kulimba kwa kapangidwe kake. Chifukwa cha kuwongolera mosasamala pakuwona ndi kuwongolera kuchuluka kwa chinyezi m'malo ophatikizira konkire amalonda, ndikosavuta kuwonjezera madzi ochulukirapo panthawi yopanga, zomwe zimapangitsa kuti pakhale magazi komanso kulekanitsa konkire kusakaniza.
Nthawi yotumiza: Jul-08-2024
