产生原因：振捣后没有用拖板、刮尺抹平；混凝土未达终凝就在上面行人和操作。

Reasons: No scraping work after vibration; People walks or works on concrete before final set.

youdao

产生原因：振捣后没有用拖板、刮尺抹平；混凝土未达终凝就在上面行人和操作。

Reasons: No scraping work after vibration; People walks or works on concrete before final set.

youdao