酸蚀下灰岩-混凝土复合体宏微观响应及劣化机制

吴术良; 沈明轩; 杜斌; 王杰

doi:10.19713/j.cnki.43-1423/u.T20251457

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酸蚀下灰岩-混凝土复合体宏微观响应及劣化机制

桥梁隧道与结构 | 更新时间：2026-07-24

- 酸蚀下灰岩-混凝土复合体宏微观响应及劣化机制
- Macroscopic and microscopic responses and deterioration mechanisms of limestone-concrete composites under acid erosion
- 铁道科学与工程学报 2026年23卷第7期页码：3418-3430
- 作者机构：
  
  贵州大学土木工程学院，贵州贵阳 550025
- 作者简介：
  
  沈明轩(1994—)，男，贵州平塘人，教授，博士，从事桥梁与隧道工程及工业固体废物再利用研究；E-mail：Zienshen@126.com
- 基金信息：
  
  国家自然科学基金资助项目(52268022);黔科合基础[2024]青年165
- DOI：10.19713/j.cnki.43-1423/u.T20251457
  中图分类号： TU45
- 收稿：2025-09-16，
  
  网络首发：2026-07-24，
  
  纸质出版：2026-07-28
- 稿件说明：
移动端阅览
吴术良,沈明轩,杜斌等.酸蚀下灰岩-混凝土复合体宏微观响应及劣化机制[J].铁道科学与工程学报,2026,23(07):3418-3430.

WU Shuliang,SHEN Mingxuan,DU Bin,et al.Macroscopic and microscopic responses and deterioration mechanisms of limestone-concrete composites under acid erosion[J].Journal of Railway Science and Engineering,2026,23(07):3418-3430.
吴术良,沈明轩,杜斌等.酸蚀下灰岩-混凝土复合体宏微观响应及劣化机制[J].铁道科学与工程学报,2026,23(07):3418-3430. DOI： 10.19713/j.cnki.43-1423/u.T20251457.

WU Shuliang,SHEN Mingxuan,DU Bin,et al.Macroscopic and microscopic responses and deterioration mechanisms of limestone-concrete composites under acid erosion[J].Journal of Railway Science and Engineering,2026,23(07):3418-3430. DOI： 10.19713/j.cnki.43-1423/u.T20251457.

摘要

岩石-混凝土复合体常因酸性地下水腐蚀发生劣化，严重威胁工程结构的安全与长期稳定。为研究其力学性能变化规律及劣化机制，以灰岩-混凝土复合体为研究对象，采用pH=3、5的硫酸溶液模拟不同强度酸性地下水，以pH=7的蒸馏水为对照，通过静态浸泡实验，结合单轴压缩试验、核磁共振(nuclear magnetic resonance

NMR)测试及X射线衍射(X-ray diffraction

XRD)分析酸侵蚀作用下复合体的力学性能、孔隙结构及矿物组分变化，并揭示其劣化机制。研究结果表明：随着溶液pH值降低，复合体的破坏模式从脆性向延性转变，峰值应变呈上升趋势，峰值应力与弹性模量呈下降趋势，且从pH=7至pH=5的下降幅度比从pH=5至pH=3的下降幅度更为明显。NMR测试结果显示，酸侵蚀导致微孔数量增多、孔径扩大，孔隙率(4.3%～6.2%)和质量损失率(0.4%～1.1%)显著增加。此外，孔隙分形维数与峰值应力、弹性模量呈负相关，这表明分形维数越高，力学性能越弱。矿物与硫酸反应导致溶液pH值递增，pH-时间曲线呈现“初期骤升→中期缓变→后期趋稳”的阶段性特征，复合体劣化根本机制为H

和

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=113662655&type=

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=113662668&type=

6.34999990

3.47133350

作用下Ca(OH)

、CaCO

等矿物溶解损失，进一步诱发C-A-H、C-S-H等分解，破坏骨架结构，促使颗粒松散、胶结减弱、裂纹扩展，最终劣化力学性能。研究成果可为岩石-混凝土复合体因酸性地下水腐蚀发生劣化引起工程结构的安全与长期稳定问题提供借鉴。

Abstract

Rock-concrete composites often deteriorate due to the corrosion of acidic groundwater

posing a serious threat to the safety and long-term stability of engineering structures. To study the variation laws of mechanical properties and the deterioration mechanism

this paper took the limestone-concrete composite as the re

search object

used sulfuric acid solutions with pH values of 3 and 5 to simulate different intensities of acidic groundwater

and used distilled water with pH 7 as the control. Through static immersion experiments

combined with uniaxial compression tests

nuclear magnetic resonance (NMR) tests and X-ray diffraction (XRD) analysis

this paper investigated the changes in mechanical properties

pore structure and mineral composition of the composites under acid erosion. The deterioration mechanism was revealed. The results show that as the pH value of the solution decreases

the failure mode of the composite changes from brittle to ductile

the peak strain shows an upward trend

and the peak stress and elastic modulus show a downward trend. Moreover

the decrease from pH 7 to pH 5 is more significant than that from pH 5 to pH 3. The NMR test results show that acid erosion leads to an increase in the number of micro-pores and pore diameters

and the porosity (4.3%～6.2%) and mass loss rate (0.4%～1.1%) increase significantly. In addition

the pore fractal dimension is negatively correlated with the peak stress and elastic modulus

indicating that the higher the fractal dimension

the weaker the mechanical properties. The reaction of minerals with sulfuric acid leads to an increase in the pH value of the solution

and the pH-time curve shows a phased characteristic of “initial sharp rise → mid-term slow change → late-term stabilization”. The fundamental mechanism of the deterioration of the composite is the dissolution and loss of minerals such as Ca(OH)

and CaCO

under the action of H

and

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=113662670&type=

https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=113662656&type=

7.28133297

4.06400013

which further induces the decomposition of C-A-H and C-S-H

destroys the skeleton structure

causes particle loosening

weakens the cementation

and promotes crack propagation

ultimately deteriorating the mechanical properties. The research can provide a reference for the study of the safety and long-term stability of engineering structures caused by the deterioration of rock-concrete composites due to the corrosion of acidic groundwater.

关键词

Keywords

references

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