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Pozzolanic activity of thermal activating coal gangue with kaolin clay composition(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2013年02期
Page:
63-67,72
Research Field:
桥梁与隧道工程
Publishing date:

Info

Title:
Pozzolanic activity of thermal activating coal gangue with kaolin clay composition
Author(s):
LI Xiao-guang;  LU Jing;  LIU Yun-xiao
School of Civil Engineering, Chang'an University, Xi'an 710061, Shaanxi, China
Keywords:
civil engineering;  coal gangue with kaolin clay;  calcination condition;  size of granule;  hydration activity
PACS:
TU521.3
DOI:
-
Abstract:
To determine the technical parameters in thermal activating coal gangue(TACG), thermogravinmetric-differential scanning calorimeter(TG-DSC)was used to explore transition temperature from crystalline of kaolin clay to amorphous state in coal gangues divided into four sizes. Properties of TACG were studied using Ca(OH)2 consumption by X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy. The results show that the transition temperature is improved with increase of granules size. Ca(OH)2 crystals are discovered in TACG at the early period, however, replaced by stratlingite and tacharanite after 28 days in the process of Ca(OH)2 consumption experiment. The molar ratios of Ca/Si increase after 28 days and then decrease after 56 days on the surface of amorphous phase of TACG. With prolongation of time, Ca(OH)2 in the system containing TACG with Ca(OH)2 remarkably decreases before 28 days, compared with stable consumption after 28 days. Higher chemical activity is found as size of TACG is in the range of 0.15 to 0.30 mm with calcination time of 1.5 to 3.0 hours at 650 ℃. 5 tabs, 7 figs, 9 refs.

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Last Update: 2013-04-20