活化粉煤灰抑制高矿化度水泥土膨胀的研究

›› 2005, Vol. 26 ›› Issue (3): 370-374.

活化粉煤灰抑制高矿化度水泥土膨胀的研究

裴向军^{1 , 2}，黄润秋¹，靖向党²

1.成都理工大学地质灾害防治与地质环境保护国家专业实验室，四川成都 610059; 2.长春工程学院，吉林长春 130021

收稿日期:2003-11-24 出版日期:2005-03-10 发布日期:2013-11-21
作者简介:裴向军，男，1970年生，博士后，副教授，从事地质灾害研究与防治工作

Study on inhibiting soil-cement expansion with activated fly-ash in high degree of mineralization zone

PEI Xiang-jun^1,2, HUANG Run-qiu¹, JING Xiang-dang²

1. National Laboratory of Geohazards Prevention and Geo-environment Protection, Chengdu University of Technology, Chengdu 610059, China; 2. Changchun Institute of Technology, Changchun 130021, China

Received:2003-11-24 Online:2005-03-10 Published:2013-11-21

摘要/Abstract

摘要： 水泥土可用做软土地基处理。在高矿化度水环境中，SO42-与水泥水化产生的AlO3-、Ca2+反应生成大量钙矾石(3CaO•Al2O3•3CaSO4•31H2O)而引起水泥土膨胀破坏，使水泥土加固体强度降低。加入水泥土中的活化粉煤灰，释放出活性二氧化硅，增加了水泥土中SiO32-的浓度，使生成反应向有利于生成硅酸钙（CSH）的方向发展，减少了Ca2+与SO42-、AlO3- 反应，并生成钙矾石的机率，从而对水泥土的膨胀起到了一定的抑制作用。抑制水泥土膨胀的机理，改变离子浓度，控制化合物的生成方向、微粒充填界面效应。粉煤灰被活化的机理是以粉状硅酸钠为主剂的材料，突破了粉煤灰网络聚合度高的表层，使其内部的活性物质得以释放。

关键词: 水泥土, 硫酸盐侵蚀, 活化粉煤灰, 抑制膨胀

Abstract: The soil-cement is one of materials that used for ground treatment in soft soil engineering. In the high degree of mineralization zone , the ettringite(3CaO•Al2O3•3CaSO4•31H2O ), which is the reaction product of hydration of cement(AlO3-,Ca2+) and SO42-, can cause expansion and crack to soil-cement and makes the strength of soil-cement decrease. The activated fly ash is mixed into the soil-cement, which can set free the activated SiO2 to increase the concentration of SiO32- and promoted the reacting speed of hydrated calcium silicate(CSH). Meanwhile, the probability of formation of ettringite is decreased. The expansion inhibiting mechanism of soil-cement is that the activated fly ash absorbs Ca2+ and changes the reaction process; and the reaction product (CSH) fills the hole of soil-cement with its micro-granule. The mechanism of activating fly-ash is the powdery sodium silicate destroys the high network polymerization surface of fly-ash, reaches the inner part of the fly ash and makes the active substance to set free.

Key words: soil-cement, sulfate erosion, activated fly-ash, inhibiting expansion

中图分类号:

TU 411

裴向军，黄润秋，靖向党,. 活化粉煤灰抑制高矿化度水泥土膨胀的研究[J]. , 2005, 26(3): 370-374.

PEI Xiang-jun , HUANG Run-qiu , JING Xiang-dang,. Study on inhibiting soil-cement expansion with activated fly-ash in high degree of mineralization zone[J]. , 2005, 26(3): 370-374.

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