Properties of Controlled Low Strength Material with Circulating Fluidized Bed Combustion Ash and Recycled Aggregates

Wei-Ting Lin; Tsai-Lung Weng; An Cheng; Sao-Jeng Chao; Hui-Mi Hsu

doi:10.3390/ma11050715

Properties of Controlled Low Strength Material with Circulating Fluidized Bed Combustion Ash and Recycled Aggregates

Materials (Basel). 2018 May 2;11(5):715. doi: 10.3390/ma11050715.

Authors

Wei-Ting Lin¹, Tsai-Lung Weng^{2

3}, An Cheng⁴, Sao-Jeng Chao⁵, Hui-Mi Hsu⁶

Affiliations

¹ Department of Civil Engineering, National Ilan University, No.1, Sec. 1, Shennong Rd., I-Lan 260, Taiwan. wtlin@niu.edu.tw.
² Physics Division, Tatung University, No.40, Sec. 3, Zhongshan N. Rd., Taipei 104, Taiwan. wengabc@ttu.edu.tw.
³ Institute of Engineering Management, College of Engineering, Tatung University, No.40, Sec. 3, Zhongshan N. Rd., Taipei 104, Taiwan. wengabc@ttu.edu.tw.
⁴ Department of Civil Engineering, National Ilan University, No.1, Sec. 1, Shennong Rd., I-Lan 260, Taiwan. ancheng@niu.edu.tw.
⁵ Department of Civil Engineering, National Ilan University, No.1, Sec. 1, Shennong Rd., I-Lan 260, Taiwan. chao@niu.edu.tw.
⁶ Department of Civil Engineering, National Ilan University, No.1, Sec. 1, Shennong Rd., I-Lan 260, Taiwan. hmhsu@niu.edu.tw.

Abstract

This study aims to investigate the effect of adding circulating fluidized bed combustion (CFBC) ash, desulfurization slag, air-cooled blast-furnace slag and coal bottom ash to the controlled low-strength material (CLSM). Test methods include slump flow test, ball drop test, water soluble chloride ion content measurement, compressive strength and length change measurement. The results show that (1) the use of CFBC hydration ash with desulfurization slag of slump flow is the best, and the use of CFBC hydration ash with coal bottom ash and slump flow is the worst; (2) CFBC hydration ash with desulfurization slag and chloride ion content is the highest; (3) 24 h ball drop test (diameter ≤ 76 mm), and test results are 70 mm to 76 mm; (4) CFBC hydration ash with desulfurization slag and compression strength is the highest, with the coal bottom ash being the lowest; increase of CFBC hydration ash can reduce compressive strength; and (5) the water-quenched blast furnace slag and CFBC hydration ash would expand, which results in length changes of CLSM specimens.

Keywords: CFBC ash; CLSM; green materials; slag.