| dc.description.abstract | The cement used in the construction of reinforced concrete is the highly consumable production. It is impossible in future to avoid the trend that in engineering. People look for the good qualitative aggregate, which can replace the first one. This paper is discussing about the usage of refining slag of steel-making of arc furnace, and of alkali activator. As usual, the sodium silicate, sodium carbonate, sodium phosphate and sodium hydroxide are named both “Activator” and “Alkali-Activator” after its pH. The long-chapter researches report that the slag, which is aroused by alkali activator, is capable of compressive strength, durability and resistance to chemical attack; however, the influence aroused by alkali activator is also prone to the defect of rapid setting, a plenty of drying shrinkage.
Except the experiment with sodium silicates, sodium hydroxides and sodium phosphates, this paper especially researches the influence of refining slag, whereby the sodium silicates put. After the experiment, we found that the pure refining slag with o.5 w/b, whose compressive strength must be added, is following the dosage of the sodium silicate; the behavior of drying shrinkage and rapid setting must be evident, are also following the dosage of the sodium silicate. In addition, the most effective method were adding gypsum and raising temperature in the experiment of the restraining shrinkage; the effect which adding air-entraining isn’t as well as the methods of adding gypsum and raising temperature, but it possesses better stability and the property which shrinkage must be reduced, is following the dosage of medicament. All of methods about restraining shrinkage in this paper are not beneficial to the compressive strength and the effect of the rapid setting is light. | en_US |