第
7
卷第
2
期
2011
年
4
月
地下空间与工程学报
Vol. 7
Apr.2011
Chinese Journal of Underground Space and Engineering
锚固砂浆硫酸盐腐蚀损伤试验研究*
陈庆玉,王桂林,徐洪,张永兴
(重庆大学土木工程学院,重庆
400045)
摘
要:采用浸烘循环加速的方法,测试了硫酸盐作用下三种水灰比的锚固砂浆整个劣化
损伤过程的羊轴抗压强度。观察了试件的宏观破坏形态,对抗压强度时变曲线和抗蚀系数进
行了回归分析。结果表明:硫酸盐腐蚀后,锚固砂浆先是表面开裂、剥落,然后失去棱角,最后
由于膨胀而破坏。随腐蚀的进行,受压破坏时表现出明显的塑性。水灰比为
0.4
和
0.45
的砂
浆在硫酸盐作用下,抗压强度先有所上升然后下降,水灰比为
0.5
的砂浆则直接进入下降段,
最大下降量达到
839
毛。水灰比越大的砂浆抵抗硫酸盐腐蚀的能力就越低。
关键词:硫酸盐腐蚀;锚固砂浆;抗压强度;水灰比
中图分类号:
TU354
文献标识码
:A
文章编号
:1673
-0836(2011
)02
-0291
一
05
Experimeotal Research
00
Sulfate Attackiog Damage of Aochor Mortar
Chen
Qingyu
,
Wang
Guilin
,
Xu
Hong
,
Zhang
Y
ongxing
( College 01 Civil Engineering ,Chongqing University , Chongqing 400045 ,P. R. China)
Abstract:
Uniaxial compression experiments of anchor mortar of three water cement ratio series with different
sulfate corrosion degrees were conducted
by
the accelerated deterioration experiment technique , and the compression
strength of the mortar in whole corrosion procedure was measured.
By
observing the macroscopic damage shape and
analyzing the time-varying strength curves and corrosion resistance coefficient
, the regularity of the strength of mortar
with different water cement ratio attacked by sulfate was discussed. The surface of the mortar cracks and
f1
aks at the
beginning
, then it loses its edge and angle and is destroyed by expansion at last.
As
the corrosion proceeds , the mor-
tar becomes more plastic under pressure
th
皿
before.
The results show that the speed of sulfate attack is accelerated
with the increasing of water cement ratio
, the compression strength of the mortar of water cement ratio
0.4
and
0.45
at first increases and then decreases , while the strength of the mortar with water cement ratio
O.
5 decreases all the
time with the corrosion progresses
, the maximum reduction reaches
83%.
Keywords:
sulfate attack; anchor mortar; compression strength; water cement ratio
1
~I
-主『
军
2
注浆体是锚固结构中的重要组成部分,起着锚
固力的传递、保持以及锚筋材料的防腐等作用。水
泥砂浆注浆体价格低廉、灌注性好,广泛应用于实
际工程中。硫酸盐侵蚀后锚固砂浆的性能退化研
究是锚固结构在硫酸盐作用下耐久性研究的基础。
国内外已经做了一些硫酸盐腐蚀砂浆或混凝土的
*收稿日期
:2011
-0
1-21
(修改稿)
损伤失效试验研究
[14]
,
EEIrass
町等
[1]
观察了
砂浆浸泡在硫酸纳溶液中的宏观损伤规律,E.
E.
Hekal[2]
研究了硫酸镜作用下水泥净浆的强度损
伤,国内有梁咏宁
[3]
研究了混凝土腐蚀后的单轴
抗压本构关系,王琴
[6]
等模拟海水对混凝土的硫
酸盐侵蚀进行了研究。但是就总体而言,由于硫酸
盐腐蚀的长期性,大部分试验研究没能反应砂浆或
混凝土在硫酸盐作用下的损伤全过程,且直接针对
作者简介:陈庆玉(1
984-)
,男,山东成武人,硕士研究生,主要从事岩土工程科研工作。
E-mail:chenqingyu84@163.com
基金项目:国家重大水专项
(2
∞
8ZX07315
-OO
1)
;重庆市自然科学基金
(CSTC
,2008BB0318)
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