| Summary: | 碩士 === 國立成功大學 === 土木工程學系碩博士班 === 97 === The joint mortar has been used on the walls of historical buildings, which ensures adhesive brickwork, bed and cross joints applied with a spreader of rending mortar to maintain smooth and splendid constructed, with some of its wall of painting to further convey the compound functions of theme and improve to enhance the artistic space. Painting ensured the value of time, history, technology, education and aesthetics. But the mortar on the wall and the painting on the wall (mural) have been easily damaged by rising damp and leakage. The guiding principle to protect historical buildings is how the water tester is going as well as realize the affection with damp and to take effective measure of being damp.
The study of this research is to collect the mix proportion and material, using bricks and mortar to apply and spread on the wall, which are with rending mortar and mortar wall-painting, simulating the condition of rising damp, using infrared thermography with water measurement tools, the condition of the surface temperature and water content, attempting to evaluate the effect of indoor trial and error to be applied with historical building, simulating the leakage condition of brick. Mortar wall-painting, using infrared thermography to test the influence of leaking of infrared thermography, and the varying condition of the surface of mortar wall-painting, the final course is using moistureproofing material–high effect silicone powder into the joint mortar and rending mortar to achieve an “antidamp mortar”. To gain the result of anti-damp, using “IR” on the simulating wall. The benefit of this study is for reference to maintain historic sites reservation in the future.
The result of this study：
1.For moistureproofing material–Using high effected silicone powder was a better result. When the grain size of the waterproofing additives was 1 %, the samples were compared with mortar, and with a better homogeneity of depression, low absorption of water and better anti-damp effect. When added more than 3%, the joint mortar and rending mortar specimens had excellent moistureproof result but their initial and final strength were lower compared to imitated ancient joint mortar and rending mortar specimens.
2.As infrared thermography was used to detection the leaking condition of the wall, the lowest temperature was at the leaking point and the temperature increased in divergence direction within the leaking area. When the wall was heated by a heater for a long time (more thermal energy was provided), the joint mortar behind the wall-painting can be observed indistinctly.
3.When infrared thermography was used to evaluate the rising damp effect on the wall, the relation between water content (Y) and surface radiation temperature difference (X) obtained in this study are:
a.Imitated ancient wall-painting mortar base layer:
Y=-10.728X+1.1834(R2=0.906)
b.Imitated ancient rending mortar layer:
Y=-13.161X+3.816(R2=0.87)
c.Moistureproof rending mortar layer:
Y=-0.6037X+0.7473(R2=0.037)
4.As infrared thermography was used to detection on-the-spot historical buildings wall-painting affected by rising damp, the affected area can be decided during heating period. The water content of the on-the-spot historical buildings wall-painting should be measured during dusk to night avoiding weather affection for more stable temperature.
5.This research used the experimental results of moistureproof joint mortar and rending mortar ash, applied moistureproof mortar (joint mortar and rending mortar) to simulating specimens. After 10 days, the experiments were performed to simulate the condition affected by rising damp. The result showed the moisture did not go through moistureproof mortar (joint mortar and rending mortar) after 30 days, which proved its excellent moistureproof results.
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