Mechanical performance of shotcrete made with a high-strength cement-based mineral accelerator

• Published in: Construction & building materials 2013-12, Vol.49, p.175-183
• Main Authors: Won, Jong-Pil, Hwang, Un-Jong, Kim, Cheol-Keun, Lee, Su-Jin
• Format: Article
• Language: English
• Subjects: Accelerator; Analysis; Cement; Gunite; High strength cement-based mineral accelerator; Permanent lining; Shotcrete
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2013.08.014

•The mechanical performance of shotcrete that used a HS-CM accelerator was evaluated.•The shotcrete that used a HS-CM accelerator to enhance the long-term strength performance.•The test data were statistically analysed at the 95% confidence level. This research investigated the mechanical performance of shotcrete that used a high-strength cement-based mineral accelerator (HS–CM) to enhance the long-term strength performance. HS–CM was added at 5–8% with respect to the cement weight; the cement-based mineral accelerator (CM) was mixed at 5% for comparison. The setting time, compressive strength, and flexural strength were measured. As the test result, in case of setting time, HS–CM which used more than 6% was slower than CM at initial set; but final set was faster. Compared with the mixture made with the CM, the HS–CM had approximately the same compressive strength at early age but higher compressive strength after 7days. The trend in flexural strength was similar to that of the compressive strength.