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 Effect of alum sludge ash on the high-temperature resistance of mortar
Tác giả hoặc Nhóm tác giả: Yue Liu, Yan Zhuge, Christopher W.K. Chow, Alexandra Keegan, Danda Li, Phuong Ngoc Pham, Yao Yao, Sritawat Kitipornchai, Rafat Siddique
Nơi đăng: Resources, Conservation & Recycling; Số: 176 (2022);Từ->đến trang: 1-5;Năm: 2021
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
The effect of high temperature on the mechanical, durability, and microstructural properties of mortar con- taining alum sludge ash (ASA) was investigated in this paper. The ASA was derived from grinding and calcinating alum sludge, a typical by-product of the drinking water treatment processes. Four different mortar mixtures with ASA content at weight percentages of 0%, 10%, 20%, and 30% (as cement replacement) were exposed to high temperatures of 300 ◦C, 550 ◦C, and 800 ◦C, respectively. The experimental results showed that mortar samples containing up to 20% of cement replaced with ASA exhibited superior high-temperature resistance to the reference ones (without ASA), especially after exposure to 800 ◦C. The thermal analysis determined the por- tlandite consumption because of ASA pozzolanic reaction, and the x-ray diffraction pattern showed that the ASA reaction might contribute to the formation of aluminum-bearing phases with excellent refractoriness in the binder matrix. In addition, crack examination conducted by backscattered electron images evidenced that the ASA addition mitigated the binder paste degradation.
ABSTRACT
The effect of high temperature on the mechanical, durability, and microstructural properties of mortar con- taining alum sludge ash (ASA) was investigated in this paper. The ASA was derived from grinding and calcinating alum sludge, a typical by-product of the drinking water treatment processes. Four different mortar mixtures with ASA content at weight percentages of 0%, 10%, 20%, and 30% (as cement replacement) were exposed to high temperatures of 300 ◦C, 550 ◦C, and 800 ◦C, respectively. The experimental results showed that mortar samples containing up to 20% of cement replaced with ASA exhibited superior high-temperature resistance to the reference ones (without ASA), especially after exposure to 800 ◦C. The thermal analysis determined the por- tlandite consumption because of ASA pozzolanic reaction, and the x-ray diffraction pattern showed that the ASA reaction might contribute to the formation of aluminum-bearing phases with excellent refractoriness in the binder matrix. In addition, crack examination conducted by backscattered electron images evidenced that the ASA addition mitigated the binder paste degradation.
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