Jun Yubin, Ahn Yu-Rhee, Jeon Dongho, Yim Hong Jae
Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea.
Department of Civil Engineering, Pusan National University, Busan 46241, Republic of Korea.
Materials (Basel). 2023 Jan 18;16(3):920. doi: 10.3390/ma16030920.
Calcium sulfoaluminate (CSA) cement is a promising solution for reducing CO emissions. While previous studies have attempted to investigate the usefulness of CSA cement via various approaches, early age nondestructive evaluations for the setting and hydration of CSA cement mixtures have not been reported. In this study, we measured the ultrasonic pulse velocity and electrical resistivity of early age CSA cement paste. Six types of samples were prepared according to different water-to-solid ratios and different amounts of gypsum. In addition, various microstructural analyses were performed to understand CSA cement hydration with the obtained nondestructive parameters. Consequently, the effect of added gypsum in CSA cement paste was discussed in terms of ye'elimite dissolution and the precipitation of ettringite, and different pore distributions produced by added gypsum were discussed in terms of compressive strength. The 5% addition of gypsum in CSA cement paste enhanced the hydration evolution, such as ettringite, and it can induce the faster setting time up to 6 h and strength development during 24 h.
硫铝酸钙（CSA）水泥是一种有望减少二氧化碳排放的解决方案。虽然先前的研究试图通过各种方法来研究CSA水泥的实用性，但尚未有关于CSA水泥混合物凝结和水化的早期无损评估的报道。在本研究中，我们测量了早期CSA水泥净浆的超声脉冲速度和电阻率。根据不同的水固比和不同的石膏用量制备了六种类型的样品。此外，进行了各种微观结构分析，以通过获得的无损参数了解CSA水泥的水化情况。因此，从钙矾石的溶解和钙矾石的沉淀方面讨论了CSA水泥净浆中添加石膏的效果，并从抗压强度方面讨论了添加石膏产生的不同孔隙分布。CSA水泥净浆中添加5%的石膏可促进水化反应，如钙矾石的形成，并可使初凝时间加快至6小时，24小时内强度增长。
