Cov yam ntxwv cuam tshuam rau kev poob qis ntawm pob zeb - ntxhia admixtures
Txhawm rau txhim kho kev ua tau zoo ntawm cov pob zeb thiab txo tus nqi ntawm cov pob zeb, cov pob zeb hauv av feem ntau ntxiv rau cov pob zeb thaum lub sij hawm ua vaj tse. Mineral admixtures tuaj yeem txhim kho qhov loj me me ntawm cov cement, yog li txo cov dej xav tau thiab txhim kho cov kua dej ntawm cov pob zeb. Nyob rau tib lub sij hawm, cov tshuaj tiv thaiv ntawm cov ntxhia admixture yog qhov muaj peev xwm hydration cov tshuaj tiv thaiv thiab cov nyhuv pozzolanic, uas txo cov dej ntawm cov cement hauv thawj theem hydration thiab tseem muaj txiaj ntsig los txhim kho cov dej ntws ntawm cov pob zeb. Txawm li cas los xij, thaum cov pa roj carbon ntsiab lus ntawm ya tshauv tshaj 5 feem pua, qhov nqus cov pa roj carbon rau hauv dej thiab cov khoom sib xyaw ua rau txo qis ntawm cov pob zeb tawg thiab qhov nce ntawm cov pob zeb poob.
Yam tseem ceeb cuam tshuam rau pob zeb slump poob - kev tsim kho ib puag ncig
Qhov kub thiab av noo nyob rau hauv kev tsim kho ib puag ncig yog ob yam tseem ceeb cuam tshuam rau qhov poob ntawm cov pob zeb. Thaum qhov kub thiab txias hauv ib puag ncig siab dhau lawm, qhov hydration ceev ntawm cov cement ua sai dua, qhov sib xws ntawm cov cement slurry nce, thiab qhov poob ntawm cov pob zeb ua pob zeb nce ntxiv. Qhov qis dua qhov txheeb ze ntawm ib puag ncig, qhov evaporation ntawm cov dej sai dua, qhov me me ntawm cov slurry, thiab qhov poob ntawm pob zeb ntau dua.
