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第三讲.锚喷支护的施工与技术管理一、喷混凝土的施工与技术管理1.喷混凝土材料选择喷射的混凝土同样是由石子、砂子、水泥、水以及速凝剂等组合而成。为了适应喷射施工的特殊工艺条件,对各种材料提出一定的质量要求。(1)石子.可采用坚硬的河卵石或碎石,使用前应筛洗,其最大粒径不应大于混凝土喷射机的规定(河卵石一般25毫米,碎石为20毫米)。为了减少回弹率或要求工程表
Lecture 3: Construction and Technical Management of Shotcrete and Spray Bracing 1. Construction and Technical Management of Sprayed Concrete 1. Sprayed Concrete Materials The sprayed concrete is also composed of stones, sand, cement, water and quick-setting admixture. In order to meet the special construction conditions of jetting, a variety of materials put forward certain quality requirements. (1) Pebbles: Hard pebbles or gravel, which should be sieved before use, should not exceed the maximum size of concrete jets (25 mm for river pebbles and 20 mm for gravel). In order to reduce the rebound rate or request a schedule