【单选题】【消耗次数：1】
关于喷射混凝土，说法错误的是：
①
先给水，后开风
②
水压应比风压大0.1MPa左右
③
喷嘴与受喷面垂直时，回弹率最低
④
水灰比适宜为0.4～0.45
参考答案：
复制
纠错
相关题目
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关于喷射混凝土施工，说法正确的是（ ）
①
—次喷射厚度太薄，骨料易产生较大的回弹
②
工作风压大于水压有利于喷层附着
③
喷头与工作面距离越短越好
④
喷射混凝土所用骨料含水率越低越好
【多选题】
以下关于喷射混凝土正确的有（）
①
喷射施工前先进行试喷，合格后再投料喷射施工
②
禁止将回弹坠地回收料作为喷射料使用
③
初喷混凝土紧跟竖井开挖面，复制前先按设计要求完成注浆小导管、钢筋网和格栅的安装工作
④
喷射混凝土分层喷射，竖井井壁一次喷射厚度为70100mm
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