Investigation of a new type of thermal insulation shotcrete with silicone rubber tubes (SSRT). (4th July 2022)

• Record Type: Journal Article
• Authors: Chen, Lianjun; Meng, Xiangrui; Liu, Guoming; Zhao, Jipeng; Liu, Zhaoxia
• Is Part Of: Construction & building materials. Volume 338(2022)
• Publication Date: 2022-07-04
• Subjects: High temperature environments -- Thermal insulation -- Shotcrete -- Silicone rubber tubes -- Thermal conductivity; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2022.127631
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Development of a new type of insulated shotcrete. Co-insulation of silicone rubber tubes and shotcrete. The heat transfer model of the new type of insulated shotcrete was established. Abstract: In order to solve the high temperature problem faced in underground engineering, a method of laying silicone rubber tubes (SRTs) in the anchor net structure to form a new type of thermal insulation shotcrete with SRTs (SSRT) is proposed in this paper. The mechanical and thermal insulation performances of SSRT are investigated, as well as the correlation between SRTs sizes and compressive strength, splitting strength and thermal conductivity. Results show that SSRT has increased the thermal insulation performance of 44–71% compared with ordinary Portland shotcrete (OPS), and the mechanical performance is affected to varying degrees. Based on the experiments in this paper, the optimal SRTs laying process parameters of SSRT are determined, i.e. SRTs with an outer diameter of 8 mm, an inter diameter of 3 mm and a distance of 8–9 mm between SRTs. This investigation provides a new exploration and theoretical basis for shotcrete support and insulation technology in high ground temperature environments.