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吕国儿, 尚 进, 黄珊珊, 李沙罡.硫酸盐和氯盐对砂浆宏微观力学性能的影响水资源与水工程学报[J].,2024,35(2):159-166
硫酸盐和氯盐对砂浆宏微观力学性能的影响
Macro-and micro-mechanical properties of mortar under sulfate and cloride attack
  
DOI:10.11705/j.issn.1672-643X.2024.02.18
中文关键词:  硫酸盐侵蚀  氯盐侵蚀  力学性能  砂浆  维氏硬度评估模型
英文关键词:sulfate attack  chloride attack  mechanical property  mortar  Vickers hardness evaluation model
基金项目:国家自然科学基金青年项目(51509081); 中国电建集团华东勘测设计研究院有限公司科技立项(KY2021-XNY-02-05)
作者单位
吕国儿1, 尚 进1, 黄珊珊1, 李沙罡2 (1.中国电建集团华东勘测设计研究院有限公司 浙江 杭州 311122 2.河海大学 港口海岸与近海工程学院 江苏 南京 210024) 
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中文摘要:
      盐湖和海水中富含的硫酸盐和氯盐会从外向内侵蚀混凝土结构。针对硫酸盐和氯盐侵蚀的不均匀特性,通过开展不同侵蚀工况下的X射线衍射、抗压强度、劈裂抗拉强度和不同侵蚀深度的维氏硬度试验,探究不同侵蚀程度下砂浆试样的物相组成和宏、微观力学性能的演变规律,并改进Logistic函数建立维氏硬度评估模型。结果表明:复合盐侵蚀下硫酸盐和氯盐的侵蚀产物减少;复合盐侵蚀下维氏硬度沿深度的分布可分为上升段、下降段和稳定段3部分;建立的评估模型能够准确描述硫酸盐和氯盐侵蚀下砂浆维氏硬度的分布规律;维氏硬度可以用于分析不同侵蚀深度材料抗压性能的演变规律。研究成果可为混凝土结构的耐久性评估和修复提供参考。
英文摘要:
      Salt lakes and seawater contain a large amount of sulfates and chlorides, which can cause degradation of underwater concrete structures from the outer surface to the inner core. According to the heterogeneous corrosion characteristics of mortar under sulfate and chloride attack, a series of tests, including X-ray diffraction, compressive strength, splitting tensile strength and Vickers hardness tests, were conducted on samples exposed to different corrosion conditions to investigate the evolution of phase composition and macro-and micro-mechanical properties of mortar. A Vickers hardness evaluation model was developed by modifying Logistic function. The results revealed that the corrosion products of sulfate and chloride decreased under combined sulfate and chloride attack. Moreover, the distribution of Vickers hardness along depth under combined attack could be divided into three phases, namely, ascending, descending and stable phase. The proposed evaluation model accurately described the Vickers hardness distribution of mortar in sulfate and chloride environment. Additionally, Vickers hardness was shown to be effective in analyzing the evolution of compression resistance in different corrosion depths. The research findings could provide some reference for durability evaluation and restoration of concrete structures.
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