台灣電力公司廢電桿回收再利用探討研究

Application Study of Recycled Concrete Aggregate Using Crushed Electricity Pole of Taiwan Power Company

蔡進滄(Jin–Cang Cai)

指導教授 ： 張子修

朝陽科技大學/理工學院/營建工程系/碩士(2012年)

摘要

本研究以臺灣電力公司報廢之廢棄預力水泥電桿回收再利用為研究標的，將臺灣電力公司報廢之廢棄預力水泥電桿加以粉碎後，使用不同新舊骨材百分比在水灰比0.7下，添加於混凝土中取代混凝土材料之骨材，透過一系列試驗探討其對再生混凝土抗壓強度、磨損量、工作度之比較。
研究結果發現，再生混凝土強度隨再生骨材之比例增加而降低，再生粗骨材取代天然骨材製成再生混凝土，其再生混凝土28天的抗壓強度可達53％~65％。再生粗骨材的吸水率較高，早期（7天）的抗壓強度反而呈現較高之現象。使用廢棄預力水泥電桿加以粉碎後之再生骨材不超過30％，再生混凝土28天的抗壓強度可達約60％以上。
實驗結果發現，使用廢電桿再生骨材替代天然粗骨材時，混凝土磨損量改變影響不大。就工作度而言，此再生混凝土的工作度比較差，在澆置、搗實方面均會增加施工時間及人力。臺灣電力公司報廢之預力水泥電桿，如能加以回收再利用，將可減少環境汙染及大地工程問題，並對減緩大地資源使用有所助益。

關鍵字

再生混凝土 ； 營建廢棄物 ； 再生骨材

並列摘要

The research was conducted to study the mechanical and engineering properties of the concrete specimens mixed with recycled aggregate of crushed power line poles which were abandoned as a type of construction waste from routine maintenance and reconstruction programs of the Taiwan Power company. In the study, crushed concrete aggregate from the poles was used as substitute of natural coarse aggregate to prepare specimens for the laboratory testing program with major parameters as the following:
(1) water/cement ratio (w/c ratio): 0.7, and
(2) percentage of aggregate substitution: 0%, 30%, 70%, and 100%
Laboratory testing program in the study include: 7-day and 28-day compressive strength, workability, and abrasion resistance. Results of the study revealed that for the water/cement ratio used, 28-day compressive strength was about 53-65% of the standard concrete (without recycled aggregate used) for the concrete specimens with the recycled aggregate, while the 7-day compressive strength was 81-89% of the 28-day strength for the concrete with the recycled aggregate at the selected substitution percentages. Results of the study suggest that the substitution rate should be less than 30% to assure that the 28-day compression strength be at least about 60% of the concrete without using the recycled aggregate.
The test results also indicate that the effects of aggregate substitution on the abrasion resistance were insignificant while workability (fluidity) of the concrete mix was remarkably reduced by the increasing use of the recycled aggregate. The study concludes that the concrete mixed with the recycled aggregate in the study can be used in practice for some secondary structures and pipeline trench excavation bedding and pipeline supports. The use of the crushed power line poles as recycled aggregate can be very beneficial for the construction waste management programs by the Taiwan Power company and the environment protection purposes for the related public and private sectors in Taiwan.

並列關鍵字

construction waste ； recycled aggregate ； non-standard concrete

參考文獻

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