| dc.description.abstract | This research is divided into three sub-themes: (1) investigate the slag for making cement mortar bar test specimen the best material ratio;(2) analysis of high temperature and pressure of water vapor pre-treatment slag for the degree of impact on stability; (3) proposed slag as fine aggregate of concrete test methods and standards.
Slag is a by-product generated when Steelmaking, so the ingredients containing iron, so that slag has comparable to strength and durability of natural aggregates, is quite a excellent material, but, when used in concrete and the road base layer, it may cause pavement uplift and concrete surface blistering phenomenon, the main reason is because when forming the slag, need to add lime to help making slag, but adding too much the slag pellets will contain extra f-CaO and f-MgO, when encountering water it will occur reaction of the phenomenon of swell, let the volume expansion from 100 to 300% and 77%, cause damage to the structure, affecting the safety of life and property.
Because the value of re-use of slag, in recent years, many materials will added slag to reduce costs, but unclear slag composition in the case, it may cause pavement uplift and concrete surface blistering phenomenon. To solve this problem, the study found that in order to cement: the slag volume ratio = 1:3, and the water usage on standard mobility to mix and making mortar bars specimen, and then conducting autoclave expansion test, With amount of expansion 0.052% and whether there is the specimen surface foaming phenomenon as the standard, it can quickly test the behavior of slag on expansion, and check that can be used in engineering, but also found to pre-treatment the slag with 215.7 ± 1.7˚C high pressure of water vapor can effectively reduce the expansion behavior of most slag. | en_US |