紙漿污泥焚化爐飛灰部分取代混凝土細粒料之可行性研究

RESEARCH ON THE FEASIBILITY OF PAPER SLUDGE FLY ASH TO REPLACE CONCRETE FINE AGGREGATE

10.6652/JoCICHE.202203_34(1).0002

王韡蒨(Wei-Chien Wang)；薛家晨(Jia-Chen Xue)；李明君(Ming-Gin Lee)；李銘育(Ming-Yu Lee)；林永值(Yung-Chih Lin)

紙漿污泥焚化爐飛灰 ； 細粒料 ； 水泥砂漿 ； 混凝土 ； paper sludge fly ash ； fine aggregate ； cement mortar ； concrete

中國土木水利工程學刊

34卷1期（2022 / 03 / 01）

11 - 20

繁體中文

台灣地區2020年污泥申報總量占一般事業廢棄物申報總量之8.69%，目前採焚燒方式處理以大幅減少體積，同時可分解其中有機物質。本研究嘗試將紙漿污泥焚化爐飛灰（PSFA）以不同之比例取代水泥砂漿與混凝土中之細粒料，藉探討其新拌、硬固、耐久性質及微觀分析，以評估其體積部分取代細粒料之可行性。研究發現，PSFA取代部分細粒料應嚴格要求取代比例與控制砂漿之水灰比，當PSFA取代比例為25%，且水膠比為0.50時，90天抗壓強度可達101.7 MPa，但乾燥收縮率亦隨之增加。PSFA可在漿體内水化產生C-S-H膠體，未水化之顆粒亦可產生堆積效應，提高混凝土的密實程度。此外，以PSFA取代部分細粒料可改善混凝土中界面過渡區（ITZ）之微觀結構，並於粗、細粒料形成緻密堆疊，顯著提升混凝土材料之抗壓強度，且隨PSFA取代比例之增加而有更加明顯之提升。

In Taiwan, the total amount of sludge discharged in 2020 accounted for 8.69% of the total amount of general industrial waste. Currently, incineration is considered an effective method to reduce the volume and decompose the organic matter in the sludge. In this study, Paper Sludge Fly Ash (PSFA) was used to replace fine aggregate in mortar and concrete by different proportions. This research evaluates the feasibility of replacing fine aggregate with PSFA. By investigating the properties of fresh, hardened, durability, and microanalysis of mortar and compressive strength of concrete. It was found that the workability of mortar is significantly affected when using PSFA to replace a part of fine aggregate. When the PSFA replacement ratio is 25% and the water-cement (W/C) ratio is 0.50, the 90 days compressive strength of mortar can reach 101.7 MPa, but the drying shrinkage also increases. Besides, PSFA can hydrate and produce C-S-H colloid, and the unhydrated particles can also produce a filling effect to improve the compactness of concrete. In addition, PSFA can also improve the microstructure of the interfacial transition zone (ITZ) in concrete, and reduce the pore between the coarse and fine aggregates, which can significantly improve the compressive strength of concrete.

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