On the Engineering performance of Geopolymer Adding Earth Material

• Main Authors: Wang,Cheng-Chieh, 汪承頡
• Other Authors: 吳傳威
• Online Access: http://ndltd.ncl.edu.tw/handle/b952vf

碩士 === 國立臺北科技大學 === 土木工程系土木與防災碩士班（碩士在職專班） === 103 === Rammed earth has been used by our ancestors for constructing buildings for several thousand years. The materials used and techniques applied in modern buildings may be much better than ever. Nevertheless, for the repairing of historical sites point of view, rammed earth does have certain requirement. For instance, those ancient residents at Minnan area, or Hakkas’ earthens that had already been logged in the world heritage were mostly made of rammed earth bricks. The original materials were needed to do the repairing works. The improvement of the property of the original materials, namely the poor moisture resistance, low compressive strength, was indeed necessary. The present research followed the previous works, trying to make use of the cohesive property of the geopolymer, added into the loess material to develop a better earth type of material. The save ethics of historical sites required to use the original materials as much as possible. The previous study revealed that the compressive strength of the original rammed earth bricks was barely 8 kgf/cm2, while the modern machine made earth bricks may reach 15 kgf/cm2. However, if adding geopolymer into the original earth, the compressive strength could be improved up to 200 kgf/cm2. Unfortunately, while trying to increase the quantity of the earth, the workability of the mixture material was too poor to make the specimen. The present work thus aimed at improving the situations of poor workability and high cost by one side adding more water or alkali liquid, and on the other side using fly ash to replace high cost segment, metakaolin, in the geopolymer. The experimental studies of the properties of the developed material include compressive strength, water absorption rate, water resistance, density, and fire resistance. The results shows that the quantity of the earth could be increase to three times as before. The compressive strengths of the specimen of every formula were well reach at least 120 kgf/cm2. The fire resistant satisfied T60 requirement. The develop material does have a good potential in repairing historical sites.