纳米材料改善普通干湿喷射混凝土回弹率和强度现场工艺试验

发布时间：2018-03-23 18:37

本文选题：纳米材料　切入点：喷射混凝土　出处：《水力发电》2017年09期

【摘要】：普通C20~C30干喷或者湿喷混凝土边墙和顶拱的综合回弹率一般为20%~30%,且干喷混凝土的强度经常不合格。通过在新建京张铁路、白鹤滩水电站、锅浪跷水电站、成都地铁18号线共4个工程的现场工艺试验表明,在普通的C20~C30干喷或者湿喷混凝土中,掺入10%自行研发的HB7-2型无机粉体纳米材料等量替代水泥,能够让综合回弹率减少52%~72%,并降低到10%以下,一次喷层厚度达到30 cm,24 h内初期强度显著提高、28 d强度提高20%以上,每个开挖支护循环的时间至少节约0.7 h,整体上提高地下洞室开挖支护的质量、安全性和经济性。
[Abstract]:The combined rebound rate of ordinary C20~C30 dry or wet sprayed concrete side walls and arch is generally 20% and 30%, and the strength of dry shotcrete is often not up to standard. Through the new Beijing-Zhang railway, Baihetan Hydropower Station, Guolang stilts Hydropower Station, The field technological tests of 4 projects of Chengdu Subway Line 18 show that 10% of the HB7-2 inorganic powder nanomaterials developed by ourselves are added to the ordinary C20~C30 dry or wet sprayed concrete to replace the cement in the same amount. The comprehensive rebound rate can be reduced by 52% and reduced to less than 10%, and the initial strength of the first spray layer can be increased significantly by more than 20% within 24 hours after 30 cm / h, and the initial strength is increased by more than 20% in 28 days. The time of each excavation support cycle is saved at least 0.7 h, and the quality, safety and economy of underground cavern excavation support are improved as a whole.
【作者单位】：中国水利水电第七工程局有限公司;
【分类号】：TV544

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