Dej stability txheej (cement stabilized gravel txheej), tseem hu ua waterproof txheej los yog waterproof txheej, yog ib feem tseem ceeb ntawm txoj kev engineering. Nws yog nyob nruab nrab ntawm subgrade filling txheej thiab pavement txheej, lub hom phiaj tseem ceeb yog los tiv thaiv kev nce qib ntawm cov dej hauv av thiab noo noo, kom ntseeg tau tias kev ruaj ntseg ntawm subgrade filling thiab uniform bearing force ntawm pavement. Cov khoom siv tseem ceeb yog av nplaum, xuab zeb, silt, cement, steel slag thiab lwm yam. Cov ntaub ntawv no tuaj yeem siv ib leeg lossis ua ke nrog ib leeg raws li lawv cov yam ntxwv kom ua tiav cov dej tsis zoo thiab kev cog lus. Kev tsim kho txoj kev yog cov roj hmab yob compaction txoj kev, paving txoj kev thiab tshuaj tsuag txoj kev. Cov kev tsim kho no muaj lawv tus kheej cov yam ntxwv, uas yuav tsum tau xaiv raws li qhov tshwj xeeb ntawm qhov project. Cov dej ruaj khov txheej yog qhov txuas tseem ceeb los xyuas kom muaj kev ruaj ntseg thiab kev ua haujlwm ntawm txoj kev. Txawm hais tias nws yog txheej txheej txheej txheem uas tsis tau them nyiaj ntau rau cov neeg, nws lub luag haujlwm thiab kev cuam tshuam tseem ceeb heev.