臺灣博碩士論文加值系統

本研究利用廢棄污泥輕質骨材(SLWA)完全取代天然砂作為細骨材，水灰比0.35、0.4以及砂率(SLWA體積/SLWA+天然石體積)40%~60%分別製作混凝土磚，探討其新拌性質、混凝土磚硬固性質、耐久性質與微觀分析，包括坍流度、凝結時間、抗壓強度、抗彎強度、單位重、吸水率、熱傳導係數、氯離子含量等。並據以評估廢棄污泥輕質骨材混凝土磚工程性質。
試驗結果顯示，廢棄污泥輕質骨材混凝土(SLWC)之坍流度隨著砂率增加而上升。由於輕質骨材中有較高含量鋅(Zn)，從而影響混凝土凝結時間，相較一般混凝土，其初終凝時間皆延後10~15小時。在硬固性質方面，抗壓強度與抗彎強度隨著砂率與水灰比增加而減少。由於輕質骨材擁有高吸水率及低比重之特性，廢棄污泥輕質骨材混凝土磚(SLWB)之吸水率介於10%~16%，與對照組相比增加10%。SLWB單位重則隨著砂率增加而減少，與對照組相比減少17%~22%。因輕質骨材低密度多孔性，使得SLWC隨著砂率增加而降低混凝土熱傳導係數。各組配比混凝土的氯離子含量結果皆低於國內目前對新拌混凝土最大水溶性氯離子含量0.15(kg/m3)。另一方面，在抗壓試驗後，透過光學顯微鏡觀測，可發現試體破裂面之SLWA均已破裂。另由掃描式電子顯微鏡(SEM)觀測下發現，SLWC隨著砂率增加，水化產物中六角型片狀CH較多，C-S-H膠體減少，進而影響混凝土抗壓強度發展。

In this study, 100% of waste sludge lightweight aggregates were used to replace natural sand as fine aggregates. Concrete bricks were made with water-cement ratio of 0.35, 0.4 and sand ratio (volume of waste sludge lightweight aggregate/volume of total aggregate) of 40% to 60%. Discuss fresh concrete properties, concrete brick hardening properties, durability properties and microscopic analysis, including slump flow, setting time, compressive strength, flexural strength, unit weight, water absorption, thermal conductivity, chloride ion content, etc. To evaluate the engineering properties of waste sludge lightweight aggregate concrete bricks.
The test results show that the slump fluidity of waste sludge lightweight aggregate concrete (SLWC) increases as the sand ratio increases. The high content of zinc (Zn) in lightweight aggregates affects the setting time of concrete. Compared with ordinary concrete, the initial and final setting time is delayed by 10 to 15 hours. In terms of rigidity, the compressive strength and flexural strength decrease with the increase of sand ratio and water-cement ratio. Because lightweight aggregates have the characteristics of high water absorption and low specific gravity, the water absorption rate of waste sludge lightweight aggregate concrete bricks (SLWB) ranges from 10% to 16%,compared with the control group, it increased by 10%. The unit weight decreased with the increase in sand rate, and decreased by 17%-22% compared with the control group. Due to the low density and porosity of lightweight aggregates, SLWC decreases the thermal conductivity of concrete as the sand ratio increases. The results of the chloride ion content of the concrete in each combination are lower than the current domestic maximum water-soluble chloride ion content of fresh concrete at 0.15 (kg/m3). On the other hand, after the compression test, the test body was observed through an optical microscope, and the SLWA on the fractured surface was all in a broken state. Scanning electron microscope (SEM) observations show that with the increase of sand rate, the hydration products of SLWC contain more hexagonal flake CH and decrease of C-S-H colloid, which affects the development of concrete compressive strength.

摘要 ....I
Abstract...............II
目錄 .............. IV
表目錄 ...........................Ⅶ
圖目錄 .........................Ⅷ
第一章 緒論 ...........................1
1-1 研究動機 ........................1
1-2 研究目的 .....................3
第二章 文獻回顧 ...............................5
2-1污泥應用於混凝土工程性質............................5
2-1-1污泥混凝土之凝結時間...............................5
2-1-2污泥混凝土之抗壓強度..................................6
2-1-3污泥混凝土之抗彎強度...................................8
2-1-4污泥混凝土之吸水率....................................10
2-2污泥輕質骨材........................11
2-2-1污泥輕質骨材生產方式..................11
2-2-2污泥輕質骨材之性質.................12
2-3輕質骨材混凝土之工程性輕質..........................14
2-3-1輕質骨材物理性質 ....................14
2-3-2輕質骨材混凝土物理性質 ..........................15
2-3-3輕質骨材混凝土力學性質 .....20
第三章 試驗規劃與方法 ...............24
3-1試驗材料...............................24
3-2試驗參數與規劃.................28
3-3試驗設備與方法............................31
第四章 試驗結果分析與討論 .......................39
4-1廢棄污泥輕質骨材混凝土新拌性質分析 ................39
4-1-1坍度及坍流度..............39
4-1-2凝結時間.............41
4-2廢棄污泥輕質骨材混凝土磚硬固性質分析 ...............43
4-2-1抗壓強度..................43
4-2-2抗彎強度.................46
4-2-3吸水率.......................48
4-2-4單位重.......................50
4-2-5熱傳導係數..............52
4-2-6長度變化....................53
4-3廢棄污泥輕質骨材耐久性質分析 ...55
4-3-1高溫水槽養護............55
4-3-2氯離子含量.............60
4-4廢棄污泥輕質骨材混凝土微觀分析 ....62
4-4-1光學顯微鏡.............62
4-4-2掃描式電子顯微鏡.............63
第五章 結論與建議 ....................................71
5-1結論 ....................71
5-2建議 .................72
參考文獻 .......................73

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