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陳宇¹，姜春萌^1,2，李雙喜^1，2，王貝¹

（1.新疆農業大學 水利與土木工程學院, 新疆 烏魯木齊 830052;2.新疆水利工程安全與水災害防治重點實驗室, 新疆 烏魯木齊 830052）

摘  要：低熱水泥廣泛應用于水工混凝土，抗硫酸鹽侵蝕是其耐久性設計的重要指標之一。采用硫酸鈉溶液全浸泡試驗法，對比研究了低熱水泥基凈漿試件與普通水泥凈漿試件孔隙率、硫酸根離子分布、膨脹率、抗壓強度和維氏硬度等物理、力學性能演化規律，對其侵蝕退化行為和損傷機理進行了分析。結果表明：硫酸鈉溶液環境下低熱水泥漿體的抗侵蝕性能優于普通硅酸鹽水泥，摻入30%粉煤灰可提升其抗侵蝕能力。低熱水泥漿體沿其侵蝕方向可由表及里分為損傷區、增強區、侵入區和完好區，維氏硬度指標能夠較好地表征水泥石損傷時變行為。

關鍵詞：硫酸鹽侵蝕；低熱水泥；離子濃度；維氏硬度；退化行為

中圖分類號：TU528.0    

文獻標志碼：A      

文章編號：1005-8249（2024）01-0057-07

DOI：10.19860/j.cnki.issn1005-8249.2024.01.011

 

CHEN Yu¹, JIANG Chunmeng^1，2, LI Shuangxi^1，2, WANG Bei¹

（1. College of Hydraulic and Civil Engineering, Xinjiang Agricultural University, Urumqi 830052, China; 2. Xinjiang Key Laboratory of Hydraulic Engineering Security and Water Disasters Prevention, Urumqi 830052, China）

Abstract: Low heat portland cement is widely applied in hydraulic concrete, where much attention should be paid to its performance of sulfate attack. In this paper, the evolution laws of physical and mechanical properties such as porosity, sulfate ion distribution, expansion rate, compressive strength and Vickers hardness of low heat cement-based pastes were determined through the full immersion test of sodium sulfate solution, as well as the compared ordinary cement pastes. Based on which, their sulfate attack deterioration behavior and damage mechanism were also analyzed. Results show that compared with ordinary portland cement, low heat cement has better resistance to sodium sulfate attack, and adding 30% fly ash could also improve its anti-corrosion performance. The corrosion section of low heat cement paste can be divided into degraded zone, strengthened zone, ingressive zone, and sound zone from the surface to the inside. Vickers hardness could better characterize the time-varying behavior of cement paste under sulfate attack.

Keywords: sulfate attack; low heat cement; ion concentration; Vickers hardness; deterioration behavior

基金項目：新疆維吾爾自治區自然科學基金資助項目（2022D01B104）。

作者簡介：陳宇（2001—），男，本科，主要研究方向：水工材料研究。

通信作者：姜春萌（1993—）, 男, 博士, 副教授, 碩士生導師, 主要研究方向：水工混凝土耐久性相關研究。 

收稿日期：2023-10-24