再生碎紅磚及底灰產製非制式控制性低強度材料之初步研究

The Preliminary Study of Controlled Low Strength Material Using Bottom Ash and Crushed Masonry Aggregate

曾毓威(Yu-Wei Tzeng)

指導教授 ： 張子修

朝陽科技大學/理工學院/營建工程系/碩士(2010年)

摘要

本研究依據控制性低強度材料之設計原則，由試驗結果顯示，以再生碎紅磚取代現地土壤之粗骨材其強度有提高之趨勢，於不同底灰比例下，水灰比為2.0、2.5及3.0時之強度分別可提高17~30%、13~22%及4~10%，而強度轉折點之水灰比約可由2.4~2.5增加到2.5~2.6，若於相同水灰比下，強度轉折點之底灰比例約可由35%~45%提高至45%~55%。
對於細骨材以底灰取代於各底灰比例下，採用再生碎紅磚為粗骨材之強度發展較為緩慢，早期強度達晚期強度百分比於水灰比為2.0、2.5及3.0時之差異約為0.4%~6.5%、3.7%~6.2%及6.7%~12.7%，其降低之幅度隨水灰比提高而增加，而對相同水灰比而言，細骨材以底灰取代對強度發展較無顯著之影響，其差異均在3%以內。

關鍵字

控制性低強度材料 ； 非制式混凝土 ； 再生材料

並列摘要

The study was conducted in accordance with current design principal of the controlled low strength material (CLSM) to investigate the compression strength of the concrete cylinders using crushed masonry aggregate in replacement of the aggregates from in-situ soils. These soils from field excavation have been commonly used in practice as aggregate materials of concrete mixture for pipeline trench and other excavation backfills.

The results of laboratory tests revealed that the strength of the CLSM concrete increases due to use of the crushed masonry aggregate compared with that using aggregates from in-situ soils. The compression strength increases at 17-30%, 13-22% and 4-10% for the CLSM with water/cement ration of 2.0, 2.5, and 3.0, respectively. Based on the test results when the water/cement ratio increases from 2.0 to 3.0, the optimal water/cement ratio beyond which decrease of compression strength due to increasing water/cement ratio becomes less significant is determined to increase from 2.4-2.5 to 2.5-2.6; while the optimal bottom ash content at which compression strength reaches a relative maximum value increases from 35-45% to 45-55%.

In addition, the strength development at early stage of the concrete pouring decreases with increasing use of the crushed masonry aggregate. The differences of compression strength between early stage (7-day) and ultimate (28-day) are 0.4-6.5%, 2.7-6.2% and 6.7-12.7% for water/cement ratio of 2.0, 2.5, and 3.0, respectively. For a particular water/cement ratio, the replacement of fine aggregate with bottom ash introduces no significant influence in strength development (within 3%) for the concrete specimens used in the study.

並列關鍵字

recycled material ； non-standard concrete ； CLSM

參考文獻

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