کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4913778 | 1428773 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of crystal modifier on the preparation of α-hemihydrate gypsum from phosphogypsum
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مهندسی عمران و سازه
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Crystal modifier is an important factor in preparation of α-hemihydrate gypsum (α-CaSO4·0.5H2O) from phosphogypsum (PG). Here, α-CaSO4·0.5H2O was prepared from PG using a semi-dry method. SEM, XRD, XPS were used to explore the effects of one or more crystal modifiers on crystal growth and mechanical properties after hydration and hardening of α-CaSO4·0.5H2O. The results showed that addition of RCOOâ can delay the hydration process of α-CaSO4·0.5H2O and improve productivity. Al3+ can be adsorbed selectively on the gypsum crystal surface, inhibiting the crystal growth along axis c, which could alter the speed in all directions and turn the crystal into a short hexahedron pole. But when RCOOâ and Al3+ were composited, a superposition effect occurred, resulting in production of a crystal with a smaller length to diameter ratio and more perfect crystal form. When RCOOâ and Al3+ were both added in 0.06% level, the flexural and compressive strength of the hardened α-CaSO4·0.5H2O could reach to 6.7 and 25.65 MPa, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Construction and Building Materials - Volume 133, 15 February 2017, Pages 323-329
Journal: Construction and Building Materials - Volume 133, 15 February 2017, Pages 323-329
نویسندگان
Zhengyang Duan, Jianxi Li, Tianguo Li, Shurui Zheng, Weiming Han, Qingyu Geng, Huibin Guo,