| dc.description.abstract | This research the possibility for sintering porous wastes and mixing natural ingredients into humidity adjusting construction materials. The research is executed mainly pursuant to the mixing ratio, sintering conditions, and characters of sintering materials. The proper samples are selected according to the sinter status of sinter body, moisture absorption efficiency, sampling multiple regression and standardization. Further analysis for ignition loss, shrinkage ratio, bending strength, bulk density and apparent density, porosity and water absorption are then taken as to benefit for mutual influences of setting parameters. The best requirements for sintering humidity adjusting construction materials is also submitted.
Spent diatomaceous earth, coal ash, volcanic ash, Allophane are chosen as the ingredient for the mixing formula. Sintering temperatures range between 900~1300℃ due to different mixing ratios among all formulas. 1~7% Sodium Perborat (Na2B4O7) is added into the mixing formula as the flux for enhancing the strength of the sinter body. The sintering experiment is executed according to the conditions mentioned above. The inspection of moisture absorption efficiency is taken on the finished sinter body. Among four sinter bodies each with its own unique mixing formula, the sinter body made of mixing spent diatomaceous earth and volcanic ash produces better moisture absorption efficiency and is thus chosen for taking further analysis. In anti-bending strength.
In respect of basic character analysis of sinter bodies, the ignition loss: under the same sinter temperature, the mixing formula with 90% of wastes, and adding 2% flux can deliver a lower ignition loss. In the term of shrinkage ratio: the formula with 90% wastes can reduce shrinkage ratio but higher temperature and higher ratio of flux can result in higher shrinkage ratio. In the anti-bending strength: a reverse relationship exists between the ratio of Spent diatomaceous earth and strength. However, there is a positive relationship between sinter temperature and addition quantity of flux.
In porosity character analysis, porosity ratio and moisture absorption: under the conditions of 90% of wastes, non-addition of flux, and lower sinter temperature will lead to higher porosity ratio and moisture absorption ratio of sinter body. The conditions mentioned above produce the same results in moisture absorption and release ratio and efficiency.
The research aims at sintering wastes into humidity adjusting construction materials effectively. After the sinter body made of prescribed experimental parameters is tested, major factors influencing the efficiency of humidity adjusting construction materials are the addition ratio of wastes and addition quantity of flux. As the practicability of futuristic humidity adjusting construction materials is taken into consideration, the best conditions for sintering humidity adjusting construction materials in this research are addition of 90% waste, 1~2% flux, and sintering temperature range of 1000~1100℃ which can enabling humidity adjusting construction materials to produce excellent moisture absorption effects. | en_US |