Experimental Study On The Connection Between External Thermal Insulation System And The Substrate Wall

Exterior wall insulation system, as a major means of power-saving technology, is used more and more in our country in recent years, and did a very important contribution to our power-saving cause. Now, in our country, the exterior wall insulation has been transmitted from the simplex use in the new constructed dwelling house to the commonality architecture and the reconstruction of the old house etc., at the same time, the structure power-saving standard has been enhanced from 50% to 65%, all of these bring forward a new challenge to the technology. At this condition, this paper takes on the item of the research on the key technique about the connection between the substrate wall and the exterior wall insulation system (Item number: J05F02), which is sustained by Shandong province education hall. In this paper, adhesive and alveolus expanded polystyrene board exterior wall insulation system,the effect of anchor in the connection between the wall and the exterior insulation system,the issue of brick which is attached to the exterior insulation system,and the durability of the connection between exterior insulation system and the wall etc. are experimentally studied.With the experimental study on the adhesive and alveolus expanded polystyrene board exterior wall insulation system, some conclusions are researched: in the experiment of bond strength, the size of the samples can adopt 40mmx40mm, which can solve the status of inaccordant of the two criterions; The affect on the bonding strength between the expanded polystyrene board and the adhesive after the immersed and freeze-thaw cycle has matters with the recover time, the time is longer the influence is smaller; when the rabbet width is invariable, the adhesive strength is decided by both rabbet obliquity and density.Secondly, the effect of the anchor in the connection of the exterior wall insulation system and the subtrate wall is experimentally studied, some conclusions are reached: in the exterior insulation system fixed by anchor, except for the pull out destroy of the anchor from the substrate wall, it can also happen at the circle of the anchor tray in the expanded polystyrene board, which must be given enough attention; to the exterior insulation system which is bear biggish stress, in order to increase the endure ability to the local stress of the expanded polystyrene board, the anchor should be mounted to the outside of the gridding fabric. Besides, the strength status of the fixation through both adhesive and anchor is analyzed.To the issue of brick attached to the exterior insulation system, firstly, the outside force attached to the brick is analyzed, point out that the warm-damp shear is one of the most important factors which has influence on the security of affix brick. Secondly, the durability of the affixed brick has relation with the breathe ability of the brick, freeze-thaw, the adhesive time and adhesive area, the stiffness of the adhesive mortar etc. As a result, it is pointed out that in order to increase the durability of the adhesive brick, factors in material and construction must be considered together.In the end, the durability of the connection between the exterior insulation system and the wall is studied, and some main factors are pointed out, such as the durability of material and the linkage itself. Besides, the problem of craze on the lay of the exterior insulation system is discussed. At last, it is pointed that the exterior insulation system is a systemic system, it must be considered as a whole in order to improve its durability.