Study on Fire-resistance and engineering properties of alkali-activated cementitious materials and mortar with Metakaolin and RHA

• Main Authors: CHIOU, SHIAN-NAN, 邱顯楠
• Other Authors: Chao-Lung Hwang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/45h2x7

碩士 === 國立臺灣科技大學 === 營建工程系 === 100 === Geopolymer with excellent physical and chemical properties than Portland cement，but is limited by the quality of raw materials and sources of instability，and expensive of raw materials situation, it is still unable to replace Portland cement, widely used in construction engineering。Nowadays, environmental consciousness promote, and the manufacture of cement has become the culprit of environmental pollution and global warming, therefore seek alternative materials to replace the highly polluting cement has become imperative for the construction industry topics, The Geopolymer is used alkaline solution rich in Si and Al ions, mineral materials or industrial waste through the dissolution and polymerization and the formation of new environmentally friendly materials。In this study, the main excitation material is metakaolin of clay mineral and agricultural waste,is rice husk ash, By adding sodium hydroxide and sodium silicate modulated into two mixed alkali activator, re-use the alkali excitation technique made of composite Geopolymer, want to use two materials through the nature of the high-temperature sintering and composite complementary bonus features, and to produce low thermal conductivity and high fire-resistant material, and to detect the other properties of engineering, as the assessment of this study for the high fire-resistant and low thermal conductivity material performance, in addition, this study in order to save the cost of use of the material directly to the rice husk ash to replace the amount increased to 25% and 50% in order to reduce the waste of metakaolin。The study results show that the Geopolymer mortar of workability, compressive strength, unit weight, thermal conductivity, fire resistance test-back warm temperature has a good effect, the compressive strength the highest was 72 MPa, unit weight a minimum of 1468 (kg/m3), back warm temperature most of the mix proportion can be in accordance with the standard postulate temperature, a minimum of 155 ℃, this proof of the Geopolymer has a superior performance of fire-resistance than Portland cement, The rice husk ash increased help to reduce the thermal conductivity, the fire-resistance of material is better,and also in line with the principle of agricultural waste rice husk ash heavy use of the study.