Stability, hardening and porosity evolution during hydrothermal solidification of sepiolite clay

Stability, hardening and porosity evolution during hydrothermal solidification of sepiolite clay
复制标题

海泡石粘土水热固化过程中的稳定性、硬化和孔隙率演变

DOI:
10.1016/j.clay.2012.08.008
复制
发表时间:
2012-11
影响因子:
5.6
通讯作者:
Emile Hideki Ishida
Emile Hideki Ishida
中科院分区:
地球科学2区
文献类型:
--
作者:
Lei Zhou;Zhenzi Jing;Yi Zhang;Ke Wu;Emile Hideki Ishida

文献摘要

参考文献

被引文献

相似文献

在不同的固化温度(100°C和200°C)下,在引入氢氧化钙的情况下进行海泡石粘土的水热固化。氢氧化钙的加入大大影响了海泡石在海泡石粘土中的稳定性。当Ca/Si摩尔比(C/S)小于0.4时,海泡石在两种固化温度下都能保持较好的稳定性,即使固化时间较长(72 h),C/S=0.4以上的海泡石也容易分解。在早期水热处理过程中(12小时前),细颗粒水合硅酸钙(CSH)凝胶沉淀,并分别为100°C和200°C固化的试样提供早期强度增强。之后,12 h后形成的纤维状CSH(I)负责最高强度,72 h后形成的板状雪硅钙石导致200°C下的强度略有下降,而72 h后形成的附聚海绵状CSH凝胶有助于100°C下的最高强度。在200°C下形成的结晶CSH(包括CSH(I)和雪硅钙石)的晶间孔在固化试样内提供比100°C下的凝胶孔更多的孔隙率。
Hydrothermal solidification of sepiolite clay was carried out at different curing temperatures (100°C and 200°C) with an introduction of calcium hydroxide. The addition of calcium hydroxide greatly affected the stability of sepiolite within sepiolite clay. When Ca/Si molar ratio (C/S) is lower than 0.4, sepiolite sustained well at both curing temperatures even for a long curing time (72h), and above C/S=0.4 sepiolite decomposed readily. During early-stage hydrothermal processing (before 12h), fine-grained particles of calcium silicate hydrate (CSH) gel precipitated and provided an early strength enhancement for the specimens solidified at 100°C and 200°C respectively. After that, fibrous CSH(I) that formed after 12h was responsible for the highest strength and platy tobermorite after 72h led to a slight decrease in strength at 200°C, while agglomerated sponge-like CSH gel formed after 72h contributed to the highest strength at 100°C. The intercrystalline pores of crystalline CSH, including CSH(I) and tobermorite, formed at 200°C provided more porosity than the gel pores at 100°C within solidified specimens.
DOI: 10.1007/bf01913489
发表时间: 1991-07
期刊: Journal of thermal analysis
影响因子: --
作者:
U. Shuali;L. Bram;M. Steinberg;S. Yariv
通讯作者: U. Shuali;L. Bram;M. Steinberg;S. Yariv
DOI: 10.1007/s10973-005-7459-0
发表时间: 2007-06-01
影响因子: 4.4
作者:
Yener, Nilguen;Onal, Mueserref;Sarikaya, Y.
通讯作者: Sarikaya, Y.
DOI: 10.1180/claymin.1996.031.2.08
发表时间: 1996-06
期刊: Clay Minerals
影响因子: 1.5
作者:
S. Martínez-Ramírez;F. Puertas;M. Blanco-Varela
通讯作者: S. Martínez-Ramírez;F. Puertas;M. Blanco-Varela
DOI: 10.1180/000985598545525
发表时间: 1998-06
期刊: Clay Minerals
影响因子: 1.5
作者:
A. Singer;K. Stahr;M. Zarei
通讯作者: A. Singer;K. Stahr;M. Zarei
DOI: 10.2109/jcersj2.117.1221
发表时间: 2009-11
影响因子: 1.1
作者:
Midori Takagi;H. Maeda;E. H. Ishida
通讯作者: Midori Takagi;H. Maeda;E. H. Ishida