台灣中部大甲溪谷關山區風化岩崩積土作為非制式混凝土骨材之研究

Application Study Of Non-Standard Concrete Using Weathered Rock Debris From Da-Jia River In Guguan Area，Taichung

游倫宙(LUN-CHOU YU)

指導教授 ： 張子修

朝陽科技大學/理工學院/營建工程系/碩士(2011年)

摘要

本研究於台中地區大甲溪谷關山區所取樣之崩積土，於試驗室進行各項工程性質之試驗，本研究實驗結果顯示對水灰比0.5、1.0及1.5使用崩積土替代率在40％以內之再生混凝土，其28天強度仍分別可達標準混凝土之80％~90％，而當崩積土替代率在40％以上，則其28天強度均為標準混凝土之60％~80％，實驗結果亦顯示使用崩積土為粗、細骨材，其28天之磨損量顯著較標準混凝土高，在水灰比0.5~1.5時，其磨損量大致增加100％~200％，意即其抗磨損性最大可降低至50％左右，由試驗結果分析可推斷本研究之風化崩積土應可應用於非制式之混凝土之使用。建議可使用於： (1)現場之次要結構。(2)重力式擋土牆設計。(3)CLSM（低強度混凝土）。(4)MRC多功能再生混凝土(或稱低強度高流度混凝土)。(5)寬度小於2.5m以下產業道路、農路或ㄧ般臨時性路面舖設等。

關鍵字

崩積土 ； 非制式混凝土 ； 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 weathered rock debris retrieved along the Da-Jia river in the Gu-Kuang vicinity, where landslide and debris flow have been the most catastrophic threat due to major hazardous events such as earthquake and tropic cyclone in central Taiwan. In the study, crushed weathered rock aggregate was used as substitute of natural coarse aggregate for preparing specimens for the laboratory testing program with major parameters as the following:
(1)water/cement ratio (w/c ratio): 0.5, 1.0 and 1.5,
(2)percentage of coarse aggregate substitution: 0%, 30%, 60%, and 100%

Laboratory testing program in the study include: 7-day and 28-day compressive strength, ductility ratio, and abrasion resistance. Results of the study revealed that for the 3 w/c ratios used, compressive strength was about 80-90% of the standard concrete (no recycled aggregate used) for the concrete with aggregate substitution rate less than about 40%, while the compressive strength was 60-80% of the standard concrete when recycled aggregate was used for more than 40% of the coarse aggregate. Results of the study indicate that abrasion resistance significantly decreases with increasing aggregate substitution rate used, which is more severely decreased to as low as 50%, i.e., abrasion quantity may be increased 100-200% of the standard concrete.

The study preliminarily conclude that the concrete mixed with the recycled aggregate used in the study can be used in practice for (1) field secondary structure, (2) gravity type retaining wall, (3) controlled low strength concrete CLSM, (4) multiple purpose recycled concrete with low strength and high fluidity, (5) pavement for light traffic and farmland/pedestrian passageway.

並列關鍵字

weathered rock debris ； recycled aggregate ； non-standard concrete

參考文獻

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【17】行政院環境保護署，再生綠建材資訊服務網，

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