This experiment can maximize the decline of the heat on steel structure by using the magnesium hydroxide and aluminum hydroxide which generally used to resistant or retardant. These materials can delay a temperature rise due to the generation of vapors around the fire resistive covering, when reacting with heat by a creating moisture. Therefore, applicability of the fire resistance mortar used magnesium hydroxide and aluminum hydroxide was studied and experimented. As a result, in case of the workability is satisfied with the condition of site, but in case of the bonding strength is not satisfied with the standard with fire resistance mortar.

In this study, cement-based accelerators, which have an advantage of preventing early frost and in developing early strength in cold-weather. Then, whether it can be secured the operating time by controlling the response time in early-stage and can be developed due to the accelerator's function, as evaluated by testing.

Although accelerators can be utilized for the prevention of early frost by developing the strength of concrete in cold weather, no security of workability occurs because early hydration makes them react rapidly. In this study, granulation was used as a method as it can control the response time of the accelerator to secure the workability of fresh concrete.

Set-controlling admixtures via granulation method may be secured the operation time by adjusting the response time. therefore, mortar with Set-controlling admixtures via granulation is measured setting-time. As a result, the possibility of initial reaction control confirmed and also was developed the required properties of setting-time.