The Study of Durability and Carbon Reduction of Building of Slag and Fly Ash Applied in Mortar

• Main Authors: Lingchun Tseng, 曾玲群
• Other Authors: Shih Wei Cho
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/74279205500738546118

碩士 === 中華科技大學 === 建築工程與環境設計研究所 === 99 === The slag and fly ash in industrial waste are mostly found in the application of structural concrete either domestic or foreign countries, which is commonly used as substitutive additives of concrete; however, due to the limitation of its slower hardening rate in early stage, it is unable to use massively in large quantity. Therefore, this study shall focus on the blast furnace slag & fly ash in the application of mortar in non-structural indoor/ outdoor decoration. Expect to increase substitution rate, reduce concrete quantity in use so as to achieve the effectiveness of carbon reduction of construction. On the other hand, the durability of mortar is less taken account of as it usually bears the key water-proof function of the construction in indoor/outdoor decoration as well as in direct contact of the external environment. In pre-casting construction method, the interface treatment of connector has usually been applied that a further study of its durability is necessary. Thus, this study will be focused on the influence of durability of mortar under the environment of temperature in deterioration as well as if there is positive effectiveness of adding slag & fly ash. Expect to reduce the later on maintenance frequency and cost due to increasing the durability so as to achieve the purpose of "sustainable construction". The various substitution rate of concrete in quantity at fixed ratio of 0.45 of water/ resin of mortar have been put and raised in water for 56 days in this study, then proceed durability test, such as, pressure-resistance and elongation properties test as well as the chloral ion transmission and porous structure measurement after various temperature deterioration. From the result of experiment, it is found a 40% substitution rate of slag & fly ash comes with optimal pressure-resistance and elongation strength. The mechanical strength is increasing in tendency after salt-spray test. The chloral ion transmission at 25℃ and 75℃ shows the resistance to the invasion of chloral ions increase along with the increasing substitution rate, which indicate those mortar with this two additives can promote the capability of chloral ions resistance. Meanwhile, it is found under this two specific temperatures the substitution rate of 40% of slag is the optimal; while fly ash at 40% and 60% is the optimal; the porous structure in measurement also comes with a responding result. Assessing by integrating the mechanical strength and durability, 60% slag and 40% fly ash have been found to be the optimal substitution rate in this study. Thus, in talking about the carbon reduction of construction by calculating according to the previous substitution rate, the max.CO2 reduction quantity of 2,761 and 1,318 kg can be achieved by every m2 of slag and fly ash as applied on the building floor with the carbon reduction ratio of 33% and 16%, which comes with better carbon reduction performance and can be promoted to the green constructions and public facilities. In the mean time, it complies with the contemporary regulation of enforcing 30% of green constructional material in use on the decoration area as well as carrying out the government policy of procurement budget in 10% green material.