傳統建築灰作材料熱反應性質及其種類之分析研究

A Practicability Study on Applying Thermogravimetry Method in Analyzing Lime Work Proportion and Compositions of Heritage and Historic Buildings

本研究以微分熱重量分析法應用於灰作試體的成分分析，共探討4 種純化合物、4 種純化合物之混合物、11 種灰作材料、14 種灰作材料之混合物、及台中刑務所演武場6 個實際試體，試體分別置於20 ％CO2 中性化試驗機21 天與室內49 天兩種方式來養護，試驗時以每分鐘上升5 ℃、10 ℃、20 ℃分別加熱至1000 ℃，然後比對其裂解溫度來分析材料之種類。研究結果顯示，未混合的材料皆有其特定裂解溫度，其溫度隨著升溫速率的加快、試體碳化程度增加而提高；同時，透過比對試體顯著裂解點數量與裂解溫度大小，亦可輕易辯識出試體材料之數量及材料種類，故對於古蹟及歷史建築灰作材料之分析將有相當大之助益。

Derivative thermogravimetric analysis (DTG) was used to analyze traditional mortar compositions in this study. These analyses tested for 4 different chemical compounds, 4 different chemical compound mixtures on 11 different raw materials used in mortar and 14 different mortar mixtures. The mortar samples were cured in either an elevated carbon dioxide atmosphere chamber at 20％ CO2 for 21 days, or a natural environment for 49 days. The samples were then examined with three different heating rates - 5℃ /min, 10℃ /min and 20℃ /min - up to 1000℃ . Results show each raw mortar material owns its unique cracking temperature and the cracking temperature rises with increasing heating rate and degree of carbonation. Through determining the cracking temperature, DTG helps to identify the compositions of mortars with a qualitative and quantitative way.