This study intends to establish the mechanical properties of polyamide fiber reinforced shotcrete (PAFRS) in terms of compressive and flexural strengths, in accordance with ASTM C1609/C1609M-12. The mechanical properties identified the influence of polyamide fiber content on the PAFRS strength. This study evaluated the toughness of PAFRS and proposed additional toughness level criteria to bette...

Basalt fiber, as a natural silicate has excellent engineering performance in high and low temperature resistance, fracture strength, toughness, shear elastic modulus nature. Shotcrete was widely used tunnel lining, slope support, coal mine roadway other projects. With the continuous development of shotcrete technology, scholars found that adding fiber to would greatly improve shotcrete. Compare...

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The field performance of a geotechnical structures including its failure mechanism should be evaluated in detail before construction in order to minimize the possibility of potential failure. In this paper, the application of soil nailing system is documented in a detailed based on case study in the north of Tehran, Iran. The total excavation depth for a 15 storey residual building wall brought...

To study the influence of different mix proportions on fresh properties wet shotcrete, rheological and air content shotcrete with admixtures before pumping were measured. In addition, pressure drop along pipeline build-up thickness studied, relationship between pumpability sprayability was discussed. This paper attempts to reveal mechanism fluidity by means pictures. The results show that free ...

Abstract At present, tunnel construction mechanics studies basically do not consider the hardening process of shotcrete. In order to reveal sprayed concrete in a sulfate environment and influence corrosion on stability, model parameters were determined combination with change rules mechanical shotcrete obtained author’s experiment. The MIDAS GTSNX finite element software was used analyze effect...

The pressure drop and conveying stability caused by the bend significantly affect pneumatic process of stiff shotcrete, which is key to solving problem long-distance transportation. In this paper, effects different air velocities (32 m/s, 36 40 m/s), water-cement ratios (0.1, 0.2, 0.3), bending-diameter (4, 12, 20) on elbow R1 R2 are studied using response surface method. characterized variatio...

Abstract The (early) hydration mechanisms of two different binder systems used for shotcrete were investigated: the so far almost unexplored low sulfate (spray binder), in field dry-mix shotcrete; and ordinary Portland cement, accelerated by aluminum sulfate, widely wet-mix shotcrete. basis fast setting spray is rapid dissolution C 3 A subsequent formation flaky CO -AFm phases. Thereby induced ...

ABSTRACT: Rock support is the basis of any underground mine and many open cut operations. Ground support methods have evolved over the years with the current trend to use bolts, mesh and shotcrete. Thin spray-on liners may be the next step replacing mesh and shotcrete, however being a relatively new product is not well understood and no standard testing procedures exist to determine the strengt...