氯盐对碱激发矿渣净浆强度影响试验

程寅; 黄新

doi:10.13700/j.bh.1001-5965.2015.0072

氯盐对碱激发矿渣净浆强度影响试验

doi: 10.13700/j.bh.1001-5965.2015.0072

程寅,
黄新^,

北京航空航天大学交通科学与工程学院, 北京 100191

基金项目: 国家自然科学基金资助项目(50278007)

详细信息

作者简介:
程寅(1984—),男 ,浙江衢州人,博士生,306876662@qq.com

通讯作者:
黄新(1956—),男,北京人,教授,hx2000@buaa.edu.cn,主要研究方向为岩土工程化学与软土固化技术、软土地基处理原理预技术、水泥基复合材料.

中图分类号: TU528.2
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出版历程
- 收稿日期: 2015-02-03
- 修回日期: 2015-03-01
- 网络出版日期: 2015-04-20

Experiment of chloride effect on strength of alkali-activated slag paste

CHENG Yin,
HUANG Xin^,

School of Transportation Science and Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

摘要

摘要: 通过对掺加氯化钠(NaCl)、氯化钙(CaCl₂)的碱激发矿渣(KC)净浆的无侧限抗压强度试验,研究两种氯盐对KC净浆强度的影响规律,利用X射线衍射(XRD)、热重分析(TG-DTG)、液相离子测定、水化程度测定等测试手段,分析两种氯盐对KC净浆强度的作用机理.结果表明,随着NaCl掺量增加,KC净浆抗压强度提高;随着CaCl₂掺量增加,KC净浆抗压强度基本不变.掺加NaCl与CaCl₂的KC净浆中均生成含氯水化物水化氯铝酸钙(Fs,Friedel's salt),但Fs的生成对KC净浆强度无影响作用.掺加NaCl的KC净浆中氢氧化钠(NaOH)的生成是导致其强度增强的主要原因,混合物中NaOH的存在提高了KC净浆的液相碱度,促进矿渣水化的进一步发生,进而生成更多的水化硅酸钙(CSH)使KC净浆强度得到提高.
- 氯化钠 /
- 氯化钙 /
- 碱激发矿渣 /
- 作用机理 /
- 水化氯铝酸钙 /
- 氢氧化钠
Abstract: Based on the results of unconfined compression tests of alkali-activated slag (KC) paste mixed with sodium chloride (NaCl) and calcium chloride (CaCl₂), the influence law of the KC paste strength changing with chloride was studied. X-ray diffraction (XRD), thermal gravity-differential thermal gravity analysis (TG-DTG), the test of ionic concentrations in the pore solution and the test of degree of hydration were used to analyze the mechanism of effect of two kinds of chlorideon KC paste strength. The research results show that the KC paste compressive strength increased with the increase in the concentration of NaCl; and KC paste compressive strength basically unchanged with the increase in the concentration of CaCl₂. The Friedel's salt (Fs) was generated in KC paste mixed with NaCl and CaCl₂, but it has no effect on the paste strength. The generation of sodium hydroxide (NaOH) in the KC paste mixed with NaCl was the main reason for its strength enhancement. NaOH existed in the KC paste improved the liquid alkalinity of paste, promoted hydration of slag and generated more calcium silicate hydrate (CSH) to improve the paste strength.
- NaCl /
- CaCl₂ /
- alkali-activated slag /
- mechanism /
- Friedel's salt /
- NaOH

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