(2) cov qauv phab ntsa pob zeb, vim qhov kev txo qis ntawm ib puag ncig qhov kub thiab txias, tom qab tshem tawm cov pwm rwb thaiv tsev ntsuas tsis nyob hauv qhov chaw, ua rau cov pob zeb ua kom txias ceev, txias shrinkage tshwm sim los ntawm sab hauv thiab sab nraud kub sib txawv tawg;
(3) pob zeb pob zeb, pob zeb slump loj heev, ua ke nrog cov txheej txheem nchuav, kev co ntau heev kom cov pob zeb sib cais thiab los ntshav, tsim cov ntsiab lus ntawm cov cement rau saum npoo ntawm cov cement txheej, vim yog kev sib haum xeeb ntawm cov khoom sib tov los ntawm kev txhim kho thaiv. tsim raws li qhov kev txhawb zog tawg;
(4) Thaum cov pob zeb sib xyaw tsim, qhov sib piv ntawm slurry rau cov pob txha thiab cov xuab zeb loj heev, cov pob zeb nws tus kheej shrinks, muaj peev xwm tiv thaiv kev tawg yog tsis muaj zog, thiab qhov tshwm sim ntawm kev tawg yog nce.
