The effect of incinerator bottom ash and bottom ash powder when sued in cement mortar

• Main Authors: Zhang, Xiang-Rui, 張庠睿
• Other Authors: Wang, Hung-Yu
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/76712897824277643206

碩士 === 國立屏東科技大學 === 土木工程系所 === 103 === In this study, fine aggregate from the garbage incinerator bottom slag is used as a major ingredient in cement mortar. The bottom slag powder, which passes #200 sieve, will replace parts of the bottom slag fine aggregate and cement in mortar proportion to investigate the change of compressive, flexural strength, porosity, and permeability of the mortars. The tests contain three groups of mortar specimens with cement content of 250 kg/m3, 320 kg/m3, and 390 kg/m3. In each specimen group, different proportions of bottom ash powder will substitute the bottom slag fine aggregate and cement, by weight percentage 0%, 10%, 20%, and 30% of each material. The water-cement ratio keeps constant as 0.6 in the 12 subgroups of mortar specimens. Based on the results above, considering the workability, two proportions of the mortar are then adopted to manufacture the formed-block bricks, in which the cement dose is 321 kg / m3, and the replacing weight percentages of slag powder to slag fine aggregate are 0% and 20%. The results show that the slag powder replacing the bottom slag fine aggregate effectively improve compressive strength and flexural strength of the mortar, however the 10% replacement, will lower the strength up to 80%. When replacing percentage is higher than 10%, the higher replacing ratio will make the compressive strength and flexural strength increase, 28-day compressive strength can reach 215 kgf / cm2 and flexural strength 19 kgf / cm2 at 30% replacement. Nonetheless, the 40% replacement will make the strength drop dramatically once again. The research also finds that all the specimen groups have low porosity, falling between 2.55% and 0.19%, which induces the very low permeability for each mortar specimen. The bending test on the five-brick-stack set find that the formed-block bricks with different sets tenon-and-mortise are damaged at main body of the bricks rather than at the tenons. It suggests that in the formed-block brick, with the given proportion, the tenon can effectively provides shear resistance from been ripped off when the stacked bricks failed. Keywords: Incineration bottom slag, bottom ash powder, formed brick, tonen