严寒环境下西部盐渍区道面混凝土受风沙侵蚀损伤机理研究

项目名称： 严寒环境下西部盐渍区道面混凝土受风沙侵蚀损伤机理研究

项目编号： No.51468049

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 建筑环境与结构工程学科

项目作者： 郝贠洪

作者单位： 内蒙古工业大学

项目金额： 48万元

中文摘要： 内蒙古西部地区地处我国严寒地区，该地区分布有大量盐渍土区，加之又是我国风沙高活动区的中心地段，复杂自然环境的复合作用对该地区的道面混凝土侵蚀严重，造成其耐久性和安全性下降。本项目基于内蒙古西部地区严寒环境、盐渍土区和风沙环境特征，分析道面混凝土的基本物理和力学性能，通过对道面混凝土在盐渍环境、干湿和冻融循环的复合作用腐蚀试验，探明其质量损失、动弹性模量、表观形态和强度损失等受腐蚀损伤规律；利用模拟该地区风沙环境的冲蚀试验系统对受盐渍环境、干湿和冻融循环复合作用腐蚀后的道面混凝土进行冲蚀试验研究，应用扫描电镜（SEM）观测其冲蚀损伤微观形貌，研究不同风沙环境冲蚀力学参数下道面混凝土冲蚀力学行为，及其细观层次上损伤的分布及发展规律；揭示在盐渍环境、干湿和冻融循环复合作用腐蚀后道面混凝土受风沙环境侵蚀的损伤机理。研究结果将为该地区道面混凝土的设计 、应用和防护提供依据。

中文关键词： 冻融循环；盐渍环境；风沙侵蚀；道面混凝土；损伤机理

英文摘要： The western region of Inner Mongolia is located in the cold area of china, and there are a large number of saline soil, as it is the central area of sandtorm high activity region. Pavement concrete in this region was seriously eroded by composite action of complex natural environment, which make its durability and safety deteriorate.This project based on environment characteristics of cold environment, saline soil and sandstorm in the western region of Inner Mongolia, analyze the basic physical and mechanical properties of pavement concrete, by means of the corrosion tests that pavement concrete are corroded in saline environment, wet-dry cycling and freeze-thaw cycles, discover corrosion rule about mass loss, dynamic elastic modulus, surface morphology and strength loss of the pavement concrete. And use the sandstorm erosion test to erode pavement concrete which have been corroded by composite action in saline environment, wet-dry cycling and freeze-thaw cycles, apply Scanning Electron Microscopy (SEM) to observe the erosion damage morphology, study on the mechanical behavior of sandstorm with different erosion mechanics parameters to pavement concrete, and its damage distribution and the development regular, reveal the damage mechanism of sandtorm erosion to pavement concrete which have been corroded by composite action in saline environment, wet-dry cycling and freeze-thaw cycles.There results will provide a basis for the design, application and protection for pavement concrete in this region.

英文关键词： Freeze-thaw cycles;Saline environment;Sandstorm erosion;Pavement concrete;Damage Mechanism