The chemical wash is pumped ahead of the cement slurry to help ensure effective mud removal and efficient cement placement.

化学冲洗剂在水泥浆之前泵入，以利于确保有效地去除泥浆和有效地放置水泥浆。

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The collapse could have been much worse, said Xavier Grospe, a 62-year-old cement mason who had just crossed the bridge an hour earlier on his way home to Burlington, Wash.

WSJ: Bridge Collapse in Washington State Sends People, Vehicles Into River