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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50378

Title: Effect of circulating fluidized bed combustion ash on the properties of roller compacted concrete
Authors: Maochieh Chi
Ran Huang
Contributors: 國立臺灣海洋大學:河海工程學系
Keywords: Circulating fluidized bed combustion (CFBC)
Roller compacted concrete (RCC)
Compaction pressure
Strength
Scanning electron microscopy (SEM)
Date: 2014-01
Issue Date: 2018-10-05T08:43:40Z
Publisher: Cement & Concrete Composites
Abstract: Abstract: Circulating fluidized bed combustion (CFBC) ash, which has such a high content of f-CaO and SO3, is a waste or by-product of petroleum coke combustion power stations. The purpose of this study is to investigate the effects of CFBC ash on the properties of roller compacted concrete (RCC). CFBC ash was used to replace fine aggregate with various dosages (5%, 10% and 15%) by weight. All mixtures were designed according to ACI 211.3R and prepared for testing. During casting, cylinders were vibrated and compacted with different pressures of 25 g/cm2, 50 g/cm2 and 75 g/cm2, respectively. Test results show that CFBC ash can increase the water absorption and effectively reduce the initial surface absorption. Meanwhile, CFBC ash has a positive effect on compressive strength, splitting tensile strength, and sulphate attack resistance of hardened RCC. SEM revealed that the main hydration products of specimens containing CFBC ash are AFt (ettringite), C–S–H (hydrated calcium silicate) and portlandite. Based on the presented observations and results, RCC with the dosage of 5% CFBC ash as fine aggregate replacement and the roller compaction pressure of 75 g/cm2 is recommended.
Relation: 45 pp.148-156
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/50378
Appears in Collections:[河海工程學系] 期刊論文

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