Articles
  • Characterization of a sodium aluminate(NaAlO2)-based accelerator made via a tablet processing method
  • Yong-Soo Leea, Dae-Sung Lima, Byung-Sik Chunb and Jae-Suk Ryoub,*
  • a Department of Civil & Environmental Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, 133-791, Seoul, Korea b Professor, Department of Civil & Environmental Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, 133- 791, Seoul, Korea
Abstract
When an accelerator that is used in shotcrete reacts on cement, it quickly sets upon early hydration. Use of cold-weather concrete prevents concrete damage from freezing. There is difficulty securing workability, however, since early hydration makes it react rapidly. In this study, a tablet that is used in pharmaceuticals was made of an aluminate-based accelerator and is discussed in terms of its mortar setting time and flow test result. Also, the rate and progress of its hydration were evaluated by analyzing the X-ray diffraction (XRD) and scanning electron microscopy (SEM) results. As a result, in the sample that included both the tablet and the aluminate-based accelerator, hydrates such as calcium aluminate hydrate (C-A-H) and calcium hydroxide [Ca(OH)2] were formed within similar times.

Keywords: Tablet, Aluminate-based accelerator, C-A-H, Early strength, Workability

This Article

  • 2013; 14(1): 87-91

    Published on Feb 28, 2013