文章信息/Info

Title:

Study on the Sulfate Resistance of Concrete and the Influencing Factors of Ion Diffusion

文章編號:

1674-3962(2021)05-0359-07

作者:

肖鵬震1; 張戎令1; 2; 胡銳鵬3; 石小清4; 竇曉崢1; 熊澤宇1

（1. 蘭州交通大學土木工程學院，甘肅 蘭州 730070）（2. 蘭州交通大學 道橋工程災害防治技術國家地方聯合工程實驗室，甘肅 蘭州 730070）（3. 中鐵西安勘察設計研究院有限責任公司，陜西 西安 710054）（4. 中鐵21局集團有限公司，甘肅 蘭州 730070)

Author(s):

XIAO Pengzhen1;  ZHANG Rongling1; 2;  HU Ruipeng3;  SHI Xiaoqing4;  DOU Xiaozheng1;  XIONG Zeyu1

(1. School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China) （2. National and Provincial Joint Engineering Laboratory of Road & Bridge Disaster Prevention and Control, Lanzhou Jiaotong University, Lanzhou 730070, China）（3. Xi’an Railway Survey and Design Institute Co., Ltd., Xi’an 710054, China）（4. China Railway 21st Bureau Group Co., Ltd., Lanzhou 730070, China)

關鍵詞:

混凝土; 耐久性; 硫酸鹽侵蝕; 硫酸根離子; 擴散

Keywords:

concrete;  durability;  sulfate erosion;  sulfate ion;  diffusion

分類號:

TU528

DOI:

10.7502/j.issn.1674-3962.201911031

文獻標志碼:

A

摘要:

為了進一步解釋混凝土受硫酸鹽侵蝕劣化機理，研究了不同水膠比以及養護時間對全浸泡下混凝土抗硫酸鹽侵蝕性能的影響，分析了硫酸鹽在混凝土中的擴散過程。試驗制備了0.32、0.35、0.38這3種水膠比的普通硅酸鹽水泥混凝土試件，對其質量、動彈性模量、抗壓強度、SO42-濃度等指標進行分析。結果表明：全浸泡條件下，混凝土抗硫酸鹽侵蝕性能隨著水膠比的降低而提高；養護28 d的混凝土抗硫酸鹽侵蝕能力大于養護3 d的混凝土，養護時間越短，水化過程越不完全，混凝土劣化速度越快；混凝土中SO42-濃度隨著水膠比的降低而降低，隨著養護時間的減小而增大。

Abstract:

In order to further explain the mechanism of concrete deterioration by sulfate erosion, the resistance to sulfate erosion of concretes samples with different water-cement ratio and curing time under full immersion conditions and sulfate solution diffusion in concrete were studied. Cement concrete samples with water-cement ratio of 0.32, 0.��35 and 0.38 were prepared. The evaluating indicators such as the mass, dynamic elastic modulus, compressive strength and sulfate ion content were analyzed. The results show that，under the condition of Na2SO4 solution full immersion, the resistance to sulfate attack increases with the decrease of water-cement ratio; the sulfate resistance of concrete cured for 28 days is greater than that of concrete cured for 3 days, the shorter the curing time is, the less complete the hydration process is, and the faster the deterioration rate of concrete is; the sulfate ion concentration in concrete decreases with the decrease of water-binder ratio and increases with the decrease of curing time.