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李    鐘 ¹  , 鄒    挺²

( 1. 東南沿海鐵路福建有限責任公司 ，福建 福州 350011 ;

2. 中鐵電氣化局集團有限公司 ，北京 100036)

摘   要： 為分析氯鹽環境下混凝土中粉煤灰摻入后 ，混凝土中鋼筋的損傷程度，以 P52. 5 級的硅酸鹽水泥 、HRB400 級鋼筋和 I 級粉煤灰為主材料，制備 0、30%和40%三種粉煤灰摻量的鋼筋混凝土試樣，即試樣 A、 試樣 B 和試樣 C , 通過孔隙率試驗和加載試驗，測試三個試樣的孔隙率變化；并且采用氯離子擴散傳輸模型和有限元模型計算損傷程度以及鋼筋的銹蝕程度。試驗結果顯示： 距離表面深度為 1 cm 時，三個試樣的氯離子濃度分布最高 ，分別為 0. 47% 、0. 31% 、0. 26% ; 距離表面深度為 1 cm 時 ，三者的氯離子擴散系數結果分別為 1. 35× 10- 12 、0. 42× 10- 12 、0. 39× 10- 12 , 氯化鈉溶液濃度達到 20%時 ，三個試樣的孔隙率結果分別為 9. 6% 、6. 4%  和 5. 8% ; 服役時間為 10 年時 ，三個試樣的受壓承載力結果分別下降至 5650 kN、8465 kN 和 8620 kN 左右，試  樣 C 的承擔荷載比率結果最佳 ，鋼筋和混凝土的承擔荷載比率結果分別為 19. 6%和 86. 4% , 粉煤灰摻量越高鋼  筋的損傷程度越小。

關鍵詞： 氯鹽環境； 粉煤灰； 混凝土； 鋼筋損傷度； 孔隙率； 銹蝕程度

中圖分類號： TU528      

文獻標志碼： A      

文章編號： 1005-8249 (2023) 06-0081-07

DOI : 10. 19860/j.cnki.issn1005-8249.2023.06.013

LI Zhong , ZOU Ting

( 1. Southeast Coastal Railway Fujian Co. ，Ltd. ，Fuzhou 350011 , China;

2. China Railway Electrification Bureau Group Co. ，Ltd. ，Beijing 100036 ,  China)

Abstract: For analysis of chlorine salt environment after the incorporation of fly ash in concrete, the damage degree of reinforcement in concrete, with levels P52.5 silicate cement, HRB400 steel and I grade fly ash as the main material, the preparation of 0%, 30% and 40%, three kinds of reinforced concrete specimens, the dosage of fly ash or sample A and sample B and C samples, through the porosity test and load test, The porosity changes of the three samples were tested. The damage degree and corrosion degree of steel bar are calculated by using chloride ion diffusion and finite element model. The results show that when the depth from the surface is 1cm, the chloride ion concentration distribution of the three samples is the highest, which are 0.47%, 0.31% and 0.26%, respectively. When the depth from the surface is 1cm, the results of chloride ion diffusion coefficient of the three samples are 1.35×10-12, 0.42×10-12 and 0.39×10-12, respectively. When the concentration of sodium chloride solution reaches 20%, the results of porosity of the three samples are 9.6%, 6.4% and 5.8%, respectively. When the service time is 10 years, the compressive bearing capacity of the three samples decreases to about 5650kN, 8465kN and 8620kN respectively. The load bearing ratio of sample C is the best, and the load bearing ratio of steel bar and concrete is 19.6% and 86.4% respectively. The higher the fly ash content, the less the damage degree of steel bar is.

Keywords: chlorine salt environment; fly ash; concrete; reinforcement damage degree; porosity; the degree of corrosion

?基金項目： 國家自然科學基金項目（ 項目編號： 23874258) 。

作者簡介： 李鐘  (1983—) , 男 ，本科 ，高級工程師 ，研究方向： 土木工程。 

  收稿日期： 2023-06-09