Engineering Property and Environmental chacteristics of Alkali Activated Cement Mortar blended with fine Desulfurization

• Main Authors: WU,JHE-YU, 吳哲宇
• Other Authors: LIN,TZONG-TZENG
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/73bn97

碩士 === 國立高雄應用科技大學 === 土木工程與防災科技研究所 === 105 === In recent years, the fine desulfurization slag changes the process, fine desulfurization slag’s basic characteristics need to be clarified. In addition, desulfurization slag is unsuitable to be the pozzolanic material because the activity index of fine desulfurization slag can not meet the specification. This study will provide a high chemical energy from alkali activation, to elevate the activity index, evaluate the potential of alkali activated fine desulfurization slag mortar as engineering materials. Firstly, the basic characteristics of the fine desulfurization slag were analyzed. Secondly, to determine the soundness by XRD and TGA and autoclave expansion test. Finally, discussion on engineering and environmental properties of fine desulfurization slag mortar, using OPC as the control group, evaluate engineering and environmental compatibility of fine desulfurization slag as engineering material. The results show that, both the activity index and alkali activated index of AAS+DS mortar are more than 75%, that means AAS+DS mortar is available to be the cementitious material. In the results of engineering and environmental properties, AAS+DS mortar with hydration products mainly composed with calcium silicate hydrate and calcium aluminum silicate hydrate. Thfore, compressive strength of AAS+DS mortar are higher than OPC mortar. Besides, better thermal resistance performance represent in AAS+DS mortar with calcium silicate hydrate. Through 550°C heat treatment, AAS+DS mortar still keep more than 98% residual strength. From result of tank test, AAS+DS mortar shows lower Ca dissolution and the all regulated heavy metal leaching levels are not detected. In summary, both compressive strength and heat treatment and tank test, AAS+DS mortar is better than OPC mortar to be the engineering material. Keywords: desulfurization slag, alkali activity, and environmental compatibility