凝灰岩粉喷射混凝土的模拟喷射及性能试验研究

Simulated spraying and performance test research of tuff powder shotcrete

开展掺凝灰岩粉喷射混凝土的模拟喷射及性能试验,并对比单掺粉煤灰及复掺粉煤灰与凝灰岩粉的方案。试验结果表明:对比单掺粉煤灰方案,凝灰岩粉的掺入略增加喷射混凝土用水量,但有助于提高拌合物的黏聚性和密实性,降低喷射回弹。喷射混凝土试件满足C25W8F100的设计要求,与岩石的黏结强度在0.89~1.06 MPa,复掺粉煤灰与凝灰岩粉的混凝土强度值略高。研究结果拓展了凝灰岩粉在喷射混凝土中的应用,为新型矿物掺合料的开发与推广应用提供技术支撑。

The simulated spraying and performance tests of shotcrete mixed with tuff powder are carried out for the first time,and the schemes of single-mixing fly ash and double-mixing fly ash and tuff powder are compared.The test results show that compared with the scheme of single-mixing fly ash,the addition of tuff powder slightly increases the water consumption of shotcrete,but it helps to improve the cohesion and compactness of the mixture and reduce the shot rebound.The shotcrete specimen meets the design requirements of C25W8F100,and the bond strength with the rock is from 0.89 MPa to 1.06 MPa,and the strength values of the concrete mixed with fly ash and tuff powder are slightly higher.The research results expand the application of tuff powder in shotcrete,and provide technical support for the development and popularization of new mineral admixtures.