改質人工粒料取代天然細粒料應用於高壓混凝土磚之研究

Research on modified artificial aggregate replaces natural fine aggregate used in compressed concrete paving units

林韋志(Wei-Zhi Lin)

指導教授 ： 王韡蒨

中原大學/工學院/土木工程研究所/碩士(2015年)

https://doi.org/10.6840/cycu201500118

摘要

本研究探討以水洗除氯漿狀尾礦製成的改質人工細粒料，取代天然細粒料應用於高壓混凝土磚的可行性，分三階段實驗：(1) 以低水灰比0.17~0.21、漿空比(水泥漿與空隙體積比)1.0~1.4及細粗粒料重量比0.9~1.5於實驗室內模擬製作高壓混凝土磚。(2)選擇配比至磚廠現地實作製磚。(3)於實驗室內以爐石粉部分取代水泥模擬製磚，探討其可行性，並以廢混凝土機製砂製磚作為對照，分析改質人工細粒料製磚的成本。
結果顯示：(1) 由於改質人工粒料具有高吸水特性，製成的高壓混凝土磚吸水率約為9~15%。(2)當漿空比增加，則增加水灰比對強度降低的趨勢愈顯著；低水灰比時，高壓混凝土磚的抗壓強度會因細粗粒料重量比增加而降低；水灰比的高低對高壓混凝土抗壓強度影響，會受制於漿空比及細粗粒料重量比。(3)改質人工細粒料高壓混凝土磚現地實作拌合不易均勻的情形，會隨爐石粉部分取代量增加而越為明顯，可以添加強塑劑的方式加以改善。(4) 爐石粉取代部分水泥的模擬試驗中，發現水膠比0.17時，拌合均勻性及強度會變差，水膠比提高至0.19或0.21時，爐石粉少量取代水泥體積約20%時，可使混合料拌合均勻，彰顯出爐石粉可以增加試體強度及緻密性的優點。(5)改質人工細粒料製作高壓混凝土磚，要在成本上維持巿場競爭力，需檢討製磚的改質人工細粒料單價。

關鍵字

改質人工細粒料、高壓混凝土磚、爐石粉

並列摘要

The purpose of this study was to evaluate the feasibility of the washed de-chlorine solid co-product stream preparation modified artificial fine aggregate (MAFA) as fine aggregate in compressed concrete paving units. According to research content procedures of this study can be divided into three experimental stage: (1) Using the low water/cement ratio (W/C) 0.17~0.21, paste/void ratio (cement paste/void between aggregate volume ratio) (P/V) 1.0~1.4 and fine aggregate/coarse aggregate weight ratio (F/C) 0.9~1.5 to manufacture compressed concrete paving units in the laboratory. (2) Choose the most appropriate proportion to molded compressed concrete paving units in brickfield. (3) By partial replacement of cement with volumes of slag 0~60 % molded compressed concrete paving units in the laboratory. And then using concrete waste fine aggregate (CWFA) as contrast set, compare the cost and performance of MAFA and CWFA used as fine aggregate in compressed concrete paving units.
The results show that: (1) Because of MAFA possess high water absorption result the paving units possess high water absorption about 9~15%. (2) The P/V ratio increase obvious that increase W/C ratio slack of strength effect. For lower W/C ratio, the compressive strength decreases with increasing F/C ratio. The influence of W/C ratio to strength is controlled by C/P and F/C ratio. (3) Using the brickfield process to molded compressed concrete paving units will trend to make the mixture unever, while add the superplasizer will improve this problem. (4) Experiment of by partial replacement of cement with volumes of slag, when the W/B ratio is 0.17 uniformity of mixture and strength of units becomes poor. When the W/B ratio is 0.19 or 0.21 while by partial replacement of cement with volumes of slag about 20% will make mixture uniform and specimen compact. (5) MAFA as fine aggregate in compressed concrete paving units has to review the cost competitiveness with CWFA.

並列關鍵字

Modified artificial fine aggregate ； Compressed concrete paving units ； Slag

參考文獻

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