西北盐渍土地区光伏支架混凝土修复界面耐久性研究
A Study on Durability of the Concrete Repair Interface of the Photovoltaic Bracket in the Saline Soil Area of Northwest China
宋山茂 1王瑞骏 2李占海 1王琦 1孙斌 1李阳 2王博楠2
作者信息
- 1. 青海黄河上游水电开发有限责任公司新能源工程建设分公司,青海西宁 810000
- 2. 西安理工大学水利水电学院,陕西西安 710048
- 折叠
摘要
在冻融、盐蚀作用下,西北盐渍土地区光伏支架基础混凝土劣化迅速.针对水泥基砂浆-混凝土界面进行耐久性试验,研究不同侵蚀作用后耐久性指标的变化规律,建立以界面抗剪强度损失率为指标的损伤度,利用扫描电镜对试件的微观结构进行分析.分析结果表明:交替作用下试件损伤最严重,其次为盐冻循环,最后为硫酸盐干湿循环,且交替作用对试件所造成的损伤为超叠加效应,其损伤度比单一侵蚀叠加结果高 6.43%;相比于MgSO4 溶液,Na2SO4 溶液对界面劣化更为严重,交替作用 6 次时两者损伤程度分别为 95.24%(Na2SO4)和 82.41%(MgSO4);微观试验显示,在经历交替作用后,试件粘结界面扩展变宽,并有侵蚀产物生成.
Abstract
Under the effects of sulfate erosion and freeze-thaw cycles,the concrete of photovoltaic bracket foundations in the northwest saline soil area deteriorates rapidly.This article presents interface durability tests the on cement mortar-concrete,studying the changes in durability indicators under different erosion effects,establishing a damage degree based on the loss rate of interface shear strength,and analyzing the micro-structure of the specimens using scanning electron microscopy.The results show that the damage to the specimen is the most severe under alternating action,followed by salt freezing cycle and finally dry wet cycle.The damage caused by alternating action on the specimen is a superimposition effect,with a damage degree 6.43%higher than that of a single erosion superposition result.Compared to MgSO4 solution,Na2SO4 solution causes more severe interface degradation,with damage levels of 95.24%(Na2SO4)and 82.41%(MgSO4)after 6 cycles of alternating action.Microscopic experiments show that after undergoing alternating effects,the bonding interface of the specimen expands and widens,and erosion products are generated.
关键词
水泥基砂浆/界面/干湿循环/盐冻/交替作用Key words
cement-based mortar/interface/dry wet cycle/salt freezing/alternation action引用本文复制引用
基金项目
陕西省自然科学基础研究计划项目(2022JQ-357)
出版年
2024
NETL
NSTL
万方数据