PCB摻料應用於一般營建混凝土工程之研究

Study on PCB Admixture Applying on Constructed Concrete Engineering

顏保儀(Pao-Yi Yen)

指導教授 ： 林至聰

國立臺北科技大學/工程學院/土木與防災研究所/碩士(2011年)

https://doi.org/10.6841/NTUT.2011.00299

摘要

本研究主要探討PCB廢粉料取代部分細粒料應用於一般混凝土之可行性，希望可藉此實驗達到廢棄物再利用及改善混凝土工作性，提高施工品質之目的；研究中以不含廢棄物的控制組為基礎，進行分別以PCB廢粉料個別取代細骨材2.5%、5%、7.5%、10%及15%比例之條件下，測試新拌與硬固階段之各項性能。
試驗結果顯示; 條件相同下，當替代細骨材量用量增多，坍度也會隨之增加，PCB摻入後最低坍度與最高坍度為190-240mm，相差至50mm之多。泌水部分一般混凝土至 220分鐘時僅累積到199.5CC，而加入PCB廢粉的2.5%~15%泌水量由230CC暴增至441CC，初凝時間於摻料在小於10%內時與一般混凝土無異，但摻料超過10%時則約增加了8%(約一小時)，無PCB摻料終凝時間為11小時，摻料在2.5%時約13個小時、5%、10%時約16個小時15%時超過18個小時以上仍未達到終凝。抗壓強度方面則有明顯的變化，28 天齡期前的抗壓強度顯示，未添加PCB廢粉之混凝土，抗壓強度皆優於添加PCB廢粉之混凝土，但42天後混凝土強度仍有持續發展之趨勢甚至於90天時，2.5%之PCB廢粉替代之抗壓強度甚至高於無PCB廢粉摻料混凝土12%。而混凝土乾縮試驗中發現並無因摻料百分比不同而對混凝土試體的乾縮值有較大的影響，其各組乾縮量曲線之發展走向極為相近，隨著養護齡期的增加其乾燥收縮量也為之減少。毒性釋出方面經TCLP試驗結果可看出原PCB廢粉內毒物經混凝土固化後釋出量幾乎驗不出，15%替代率時銅釋出僅有安全量之百分之一表示固化毒物效果良好，而最佳的PCB廢粉替代率應該介於5~10%之間。

關鍵字

印刷電路板廢粉料 ； 細骨材

並列摘要

The purpose of the study is to search the possibility of PCB wasted powder replace part of fine aggregate in normal concrete, it might reuse waste, getting better workability, higher slump then improving construction quality. We use the present concrete of Lungmen project of TPC to match quality required on the study. At first, setting non-waste-contained as the negative controls and then let PCB replace fine aggregate by 2.5%, 5%, 7.5%, 10% and 15% to see the performance of initial and hardened period of concrete.
The results of study shows that slump is getting higher when increasing replaced quantity, the minimum and maximum value between 190-240mm, about 50mm variation. Besides, the normal concrete only has 199.5C.C. bleeding after 220 minutes, however it up 230C.C. to 441C.C. when add 2.5% to 15% PCB in it. For the initial setting time, it's similar to normal concrete when admixture is under 10%, but increasing 8% (about 1 hour) if over 10%. The initial setting time is about 13 hours at 2.5% admixture, 16 hours for 5% and 10%, but it can't reach final setting even 18 hours pasted for 15%.
The compressive strength has obviously variety, it shows non-PCB-contained is better than PCB-contained before ages of 28 days, and continue developing after 42 days. The strength of 2.5%-PCB-contained is 12% higher than non-PCB-contained after 90 days. Therefore, the best substitution rate of PCB is between 5% and 10%. There is no evidence shows admixture rate effects drying shrinkage in this study, and the of shrinkage-graph of each group is pretty closed. The drying shrinkage value is decreasing while curing ages increased. For the toxicity liberation, its quantity within PCB, in TCLP testing result, is extremely low after concrete hardened. There is only 1% of Cu safety value released at 15% rate, which means hardened toxicity is well.

並列關鍵字

Waste PCB ； sand

參考文獻

參考文獻

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