摘要
川藏铁路处于高原严酷环境条件下,混凝土受冻融、侵蚀环境等的影响其性能劣化较平原地区严重。通过自主研发的有机表面防护材料,研究其对高原环境下混凝土耐久性能的影响及作用机理。结果表明:有机防护材料可大幅提升不同强度等级混凝土抗氯离子渗透及降低吸水性能,强紫外线照射对涂覆有机防护材料的高强度等级混凝土疏水性能的影响比低强度等级混凝土大;XRD和SEM-EDS分析表明:有机防护材料可在水泥基硬化浆体表面形成致密的硅氧疏水基团,阻止外界水进入混凝土内部。同时,TEOS水解形成的具有火山灰活性的硅胶可与水泥基材料的水化产物CH发生反应,生成C-S-H凝胶,从而降低混凝土碳化深度和提高抗冻融性能,提升混凝土整体耐久性。
The Sichuan-Xizang Railway is located in a harsh plateau environment,and the performance of concrete deteriorates more severely than in plain areas due to the influence of freeze-thaw and erosion environments.Study the impact and mechanism of self-developed organic surface protective materials on the durability performance of concrete in high-altitude environments.The results show that organic protective materials can significantly improve the resistance of different grades of concrete to chloride ion penetration and reduce water absorption performance.Strong ultraviolet radiation has a greater impact on the hydrophobicity of high grade concrete coated with organic protective materials than low grade concrete;XRD and SEM-EDS analysis indicate that organic protective materials can form dense silica hydrophobic groups on the surface of cement-based hardened slurries,preventing external water from entering the interior of the concrete.At the same time,silica gel with pozzolanic activity formed by hydrolysis of TEOS can react with the hydration product CH of cement-based materials to generate C-S-H gel,thus reducing the carbonation depth of concrete,improving the freeze-thaw resistance and improving the overall durability of concrete.
作者
秦善良
祝小靓
徐芸
张明
王学朋
周晋筑
胡松涛
QIN Shanliang;ZHU Xliaoliang;XU Yun;ZHANG Ming;WANG Xuepeng;ZHOU Jinzhu;HU Songtao(Sinohydro Bureau 7 Co.,Ltd.,Chengdu 610081,China;China Construction Western Construction Building Materials Research Institute Co.,Ltd.,Chengdu 610221,China;Jiujiang University,Jiujiang 332005,China;China Construction Railway Investment and Construction Group Co.,Ltd.,Beijing 102600,China;Jiangxi Academy of Water Conservancy,Nanchang 330029,China)
出处
《混凝土》
北大核心
2025年第8期32-36,42,共6页
Concrete
基金
国家自然科学基金面上项目(52378172)
中电建七局南方建设有限公司(STT-SJQ-SG0022020-KY-008)
江西省水利厅重大科技项目(202124ZDKT28)。
关键词
高原环境
表面防护
抗冻融循环
抗碳化
耐久性
plateau environment
surface protection
freeze-thaw resistance
carbonation resistance
durability
