轻质喷射混凝土的设计制备及防脱落性能评价  

Design preparation and anti detachment performance evaluation of lightweight shotcrete

作　　者：张旭华 田明昆 张高寅 曾雪玲 辜涛 ZHANG Xuhua;TIAN Mingkun;ZHANG Gaoyin;ZENG Xueling;GU Tao(China Railway Ninth Bureau Group Fifth Engineering Co.,Ltd.,Chengdu 611730,China;School of Materials and Chemistry,Southwest University of Science and Technology,Mianyang 621010,China;Jiahua Special Cement Co.,Ltd.,Leshan 614000,China)

机构地区：[1]中铁九局集团第五工程有限公司,四川成都611730 [2]西南科技大学材料与化学学院,四川绵阳621010 [3]嘉华特种水泥股份有限公司,四川乐山614000

出　　处：《四川建材》2025年第2期10-13,共4页Sichuan Building Materials

基　　金：中铁九局重大科研项目:新型无碱液体速凝剂研发及应用研究(2022-重大-14)。

摘　　要：隧道加固中喷射混凝土的脱落对工人和使用者构成安全威胁,改变喷射混凝土密度、残余荷载和粘结强度可有效防止上述风险。研究轻质膨胀珍珠岩(LEP)、聚丙烯纤维和纳米黏土(NC)对混凝土性能的影响,结果表明,6 kg/m^(3)的聚丙烯纤维将混凝土的残余载荷增加到3.1 MPa,70%的LEP将混凝土密度降低到1600 kg/m^(3)以下时混凝土结构的抗压强度可提高22.5 MPa以上。上述混凝土体系中的纤维可阻止未粘结的喷射混凝土块脱落,且LEP可减少混凝土脱落带来的冲击能量。The detachment of sprayed concrete in tunnel reinforcement poses a safety threat to workers and users.Changing the density,residual load,and bond strength of sprayed concrete can effectively prevent the above risks.This article investigates the effects of lightweight expanded perlite(LEP),polypropylene fibers,and nanoclay(NC)on the properties of concrete.The results showed that 6 kg/m^(3) polypropylene fibers increased the residual load of concrete to 3.1 MPa,and 70%LEP reduced the concrete density to below 1600 kg/m^(3),resulting in an increase of over 22.5 MPa in compressive strength of the concrete structure.The fibers in the above concrete system can prevent the detachment of unbound sprayed concrete blocks,and LEP can reduce the impact energy caused by concrete detachment.

关 键 词：喷射混凝土 轻质混凝土 残余荷载 粘结性 

分 类 号：U454[建筑科学—桥梁与隧道工程]