| dc.description.abstract | At present, there is no international expansion detection method and the judgment standard of electric arc furnace slag (EAF slag) application in cementitious materials, and the industry in the reuse of EAF slag, need to be stabilized, now commonly used to test the stability of EAF slag hot pressure test. Therefore, this study focuses on the testing method of mortar containing EAF slag, the stabilization technology of EAF slag, and the engineering properties of the use of granules as cementitious materials. Two kinds of EAF oxidation slag and one kind of EAF reduction slag are used to partially replace the natural fine aggregate, and the degradation effects of different environments on the cement mortar containing EAF slag are analyzed in terms of replacement ratio and different environments. The environment will be room temperature, hot pressure, water immersion at 80°C, drying-wetting cycles, high alkali at 80°C and sulfate erosion on the mortar specimens with different substitution ratios for deterioration, and its safety will be evaluated by the results of expansion and compressive strength tests. The swelling behavior and test results were used to develop a method for predicting the engineering properties of cement mortars containing EAF slag in order to evaluate the long-term effects of EAF slag on engineering properties when used as cementitious materials.
The results show that the EAF slag can be observed three stages of expansion behavior in the room temperature environment for one year; in the 80℃ water immersion environment, the three stages of expansion behavior development can be shortened to 28 days to complete; for EAF slag stability treatment method, the hot water immersion method, has simple, safe and save time effect, and by the hot water immersion method of treatment of EAF slag also has good quality and stability of the effectiveness. Test shows that the unstabilized EAF slag in the hot pressure, 80℃ water immersion and 80℃ high alkaline environment will produce hydration expansion phenomenon, lead to more serious deterioration, in the sulfate environment is less impact on the EAF slag. EAF slag has been stabilized and treated, even if it completely replaces the natural fine aggregate, there is no significant effect on the engineering properties of the resulting cementitious materials, and also found that the linear regression equation from the 80°C immersion environment can be found to simulate the expansion of the corresponding 84 days immersion age when the proportion of natural fine aggregate replaced by different EAF slag. | en_US |